bongster/leetcode

✏️ Leetcode Solutions with Python3

Update time: 2022-09-04 23:24:28

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#	Title	Source Code	Article	Difficulty
1	two-sum	Python3	📝	Easy
2	add-two-numbers	Python3	📝	Medium
3	longest-substring-without-repeating-characters	Python3	📝	Medium
4	median-of-two-sorted-arrays	Python3		Hard
5	longest-palindromic-substring	Python3	📝	Medium
6	zigzag-conversion	Python3	📝	Medium
7	reverse-integer	Python3	📝	Medium
8	string-to-integer-atoi	Python3	📝	Medium
9	palindrome-number	Python3	📝	Easy
10	regular-expression-matching		📝	Hard
11	container-with-most-water	Python3	📝	Medium
12	integer-to-roman	Python3	📝	Medium
13	roman-to-integer	Python3	📝	Easy
14	longest-common-prefix	Python3	📝	Easy
15	3sum	Python3	📝	Medium
16	3sum-closest	Python3	📝	Medium
17	letter-combinations-of-a-phone-number		📝	Medium
18	4sum	Python3	📝	Medium
19	remove-nth-node-from-end-of-list	Python3	📝	Medium
20	valid-parentheses	Python3	📝	Easy
21	merge-two-sorted-lists	Python3	📝	Easy
22	generate-parentheses	Python3	📝	Medium
23	merge-k-sorted-lists	Python3	📝	Hard
24	swap-nodes-in-pairs	Python3	📝	Medium
25	reverse-nodes-in-k-group		📝	Hard
26	remove-duplicates-from-sorted-array	Python3	📝	Easy
27	remove-element	Python3	📝	Easy
28	find-the-index-of-the-first-occurrence-in-a-string	Python3	📝	Medium
29	divide-two-integers	Python3	📝	Medium
30	substring-with-concatenation-of-all-words		📝	Hard
31	next-permutation		📝	Medium
32	longest-valid-parentheses	Python3	📝	Hard
33	search-in-rotated-sorted-array	Python3	📝	Medium
34	find-first-and-last-position-of-element-in-sorted-array	Python3	📝	Medium
35	search-insert-position	Python3	📝	Easy
36	valid-sudoku	Python3	📝	Medium
37	sudoku-solver	Python3	📝	Hard
38	count-and-say	Python3	📝	Medium
39	combination-sum	Python3	📝	Medium
40	combination-sum-ii		📝	Medium
41	first-missing-positive		📝	Hard
42	trapping-rain-water		📝	Hard
43	multiply-strings		📝	Medium
44	wildcard-matching		📝	Hard
45	jump-game-ii		📝	Medium
46	permutations	Python3	📝	Medium
47	permutations-ii	Python3	📝	Medium
48	rotate-image	Python3	📝	Medium
49	group-anagrams	Python3	📝	Medium
50	powx-n		📝	Medium
51	n-queens		📝	Hard
52	n-queens-ii		📝	Hard
53	maximum-subarray	Python3	📝	Medium
54	spiral-matrix	Python3	📝	Medium
55	jump-game	Python3	📝	Medium
56	merge-intervals	Python3	📝	Medium
57	insert-interval		📝	Medium
58	length-of-last-word	Python3	📝	Easy
59	spiral-matrix-ii		📝	Medium
60	permutation-sequence		📝	Hard
61	rotate-list	Python3	📝	Medium
62	unique-paths	Python3	📝	Medium
63	unique-paths-ii		📝	Medium
64	minimum-path-sum		📝	Medium
65	valid-number		📝	Hard
66	plus-one	Python3	📝	Easy
67	add-binary	Python3	📝	Easy
68	text-justification			Hard
69	sqrtx	Python3	📝	Easy
70	climbing-stairs	Python3	📝	Easy
71	simplify-path	Python3	📝	Medium
72	edit-distance		📝	Hard
73	set-matrix-zeroes	Python3	📝	Medium
74	search-a-2d-matrix	Python3	📝	Medium
75	sort-colors	Python3	📝	Medium
76	minimum-window-substring	Python3	📝	Hard
77	combinations		📝	Medium
78	subsets	Python3	📝	Medium
79	word-search	Python3	📝	Medium
80	remove-duplicates-from-sorted-array-ii	Python3	📝	Medium
81	search-in-rotated-sorted-array-ii	Python3	📝	Medium
82	remove-duplicates-from-sorted-list-ii	Python3	📝	Medium
83	remove-duplicates-from-sorted-list	Python3	📝	Easy
84	largest-rectangle-in-histogram	Python3	📝	Hard
85	maximal-rectangle		📝	Hard
86	partition-list	Python3	📝	Medium
87	scramble-string			Hard
88	merge-sorted-array	Python3	📝	Easy
89	gray-code		📝	Medium
90	subsets-ii		📝	Medium
91	decode-ways	Python3	📝	Medium
92	reverse-linked-list-ii	Python3	📝	Medium
93	restore-ip-addresses		📝	Medium
94	binary-tree-inorder-traversal	Python3	📝	Easy
95	unique-binary-search-trees-ii		📝	Medium
96	unique-binary-search-trees	Python3	📝	Medium
97	interleaving-string		📝	Medium
98	validate-binary-search-tree	Python3	📝	Medium
99	recover-binary-search-tree		📝	Medium
100	same-tree	Python3	📝	Easy
101	symmetric-tree		📝	Easy
102	binary-tree-level-order-traversal	Python3	📝	Medium
103	binary-tree-zigzag-level-order-traversal		📝	Medium
104	maximum-depth-of-binary-tree	Python3	📝	Easy
105	construct-binary-tree-from-preorder-and-inorder-traversal	Python3	📝	Medium
106	construct-binary-tree-from-inorder-and-postorder-traversal		📝	Medium
107	binary-tree-level-order-traversal-ii	Python3	📝	Medium
108	convert-sorted-array-to-binary-search-tree	Python3	📝	Easy
109	convert-sorted-list-to-binary-search-tree		📝	Medium
110	balanced-binary-tree		📝	Easy
111	minimum-depth-of-binary-tree	Python3	📝	Easy
112	path-sum	Python3	📝	Easy
113	path-sum-ii		📝	Medium
114	flatten-binary-tree-to-linked-list		📝	Medium
115	distinct-subsequences	Python3	📝	Hard
116	populating-next-right-pointers-in-each-node		📝	Medium
117	populating-next-right-pointers-in-each-node-ii		📝	Medium
118	pascals-triangle	Python3	📝	Easy
119	pascals-triangle-ii		📝	Easy
120	triangle	Python3	📝	Medium
121	best-time-to-buy-and-sell-stock	Python3	📝	Easy
122	best-time-to-buy-and-sell-stock-ii	Python3	📝	Medium
123	best-time-to-buy-and-sell-stock-iii		📝	Hard
124	binary-tree-maximum-path-sum		📝	Hard
125	valid-palindrome		📝	Easy
126	word-ladder-ii		📝	Hard
127	word-ladder		📝	Hard
128	longest-consecutive-sequence		📝	Medium
129	sum-root-to-leaf-numbers	Python3	📝	Medium
130	surrounded-regions	Python3	📝	Medium
131	palindrome-partitioning		📝	Medium
132	palindrome-partitioning-ii		📝	Hard
133	clone-graph	Python3	📝	Medium
134	gas-station	Python3	📝	Medium
135	candy		📝	Hard
136	single-number	Python3	📝	Easy
137	single-number-ii	Python3	📝	Medium
138	copy-list-with-random-pointer	Python3	📝	Medium
139	word-break		📝	Medium
140	word-break-ii		📝	Hard
141	linked-list-cycle		📝	Easy
142	linked-list-cycle-ii		📝	Medium
143	reorder-list	Python3	📝	Medium
144	binary-tree-preorder-traversal	Python3	📝	Easy
145	binary-tree-postorder-traversal	Python3	📝	Easy
146	lru-cache		📝	Medium
147	insertion-sort-list		📝	Medium
148	sort-list		📝	Medium
149	max-points-on-a-line		📝	Hard
150	evaluate-reverse-polish-notation		📝	Medium
151	reverse-words-in-a-string	Python3	📝	Medium
152	maximum-product-subarray	Python3	📝	Medium
153	find-minimum-in-rotated-sorted-array		📝	Medium
154	find-minimum-in-rotated-sorted-array-ii	Python3	📝	Hard
155	min-stack	Python3	📝	Medium
156	binary-tree-upside-down	🔒		Medium
157	read-n-characters-given-read4	🔒	📝	Easy
158	read-n-characters-given-read4-ii-call-multiple-times	🔒		Hard
159	longest-substring-with-at-most-two-distinct-characters	🔒	📝	Medium
160	intersection-of-two-linked-lists	Python3	📝	Easy
161	one-edit-distance	🔒	📝	Medium
162	find-peak-element	Python3	📝	Medium
163	missing-ranges	🔒	📝	Easy
164	maximum-gap		📝	Hard
165	compare-version-numbers		📝	Medium
166	fraction-to-recurring-decimal		📝	Medium
167	two-sum-ii-input-array-is-sorted	Python3	📝	Medium
168	excel-sheet-column-title			Easy
169	majority-element	Python3	📝	Easy
170	two-sum-iii-data-structure-design	🔒	📝	Easy
171	excel-sheet-column-number		📝	Easy
172	factorial-trailing-zeroes		📝	Medium
173	binary-search-tree-iterator		📝	Medium
174	dungeon-game	Python3	📝	Hard
179	largest-number		📝	Medium
186	reverse-words-in-a-string-ii	🔒	📝	Medium
187	repeated-dna-sequences	Python3	📝	Medium
188	best-time-to-buy-and-sell-stock-iv	Python3	📝	Hard
189	rotate-array	Python3	📝	Medium
190	reverse-bits		📝	Easy
191	number-of-1-bits	Python3	📝	Easy
198	house-robber	Python3	📝	Medium
199	binary-tree-right-side-view	Python3	📝	Medium
200	number-of-islands	Python3	📝	Medium
201	bitwise-and-of-numbers-range	Python3	📝	Medium
202	happy-number	Python3	📝	Easy
203	remove-linked-list-elements	Python3	📝	Easy
204	count-primes		📝	Medium
205	isomorphic-strings	Python3	📝	Easy
206	reverse-linked-list	Python3	📝	Easy
207	course-schedule		📝	Medium
208	implement-trie-prefix-tree	Python3	📝	Medium
209	minimum-size-subarray-sum		📝	Medium
210	course-schedule-ii		📝	Medium
211	design-add-and-search-words-data-structure	Python3	📝	Medium
212	word-search-ii	Python3	📝	Hard
213	house-robber-ii	Python3	📝	Medium
214	shortest-palindrome		📝	Hard
215	kth-largest-element-in-an-array	Python3	📝	Medium
216	combination-sum-iii		📝	Medium
217	contains-duplicate	Python3	📝	Easy
218	the-skyline-problem		📝	Hard
219	contains-duplicate-ii		📝	Easy
220	contains-duplicate-iii		📝	Medium
221	maximal-square	Python3	📝	Medium
222	count-complete-tree-nodes	Python3	📝	Medium
223	rectangle-area			Medium
224	basic-calculator		📝	Hard
225	implement-stack-using-queues		📝	Easy
226	invert-binary-tree	Python3	📝	Easy
227	basic-calculator-ii	Python3	📝	Medium
228	summary-ranges		📝	Easy
229	majority-element-ii		📝	Medium
230	kth-smallest-element-in-a-bst		📝	Medium
231	power-of-two	Python3	📝	Easy
232	implement-queue-using-stacks		📝	Easy
233	number-of-digit-one		📝	Hard
234	palindrome-linked-list	Python3	📝	Easy
235	lowest-common-ancestor-of-a-binary-search-tree	Python3	📝	Easy
236	lowest-common-ancestor-of-a-binary-tree	Python3	📝	Medium
237	delete-node-in-a-linked-list	Python3	📝	Medium
238	product-of-array-except-self	Python3	📝	Medium
239	sliding-window-maximum	Python3	📝	Hard
240	search-a-2d-matrix-ii	Python3	📝	Medium
241	different-ways-to-add-parentheses			Medium
242	valid-anagram	Python3	📝	Easy
243	shortest-word-distance	🔒	📝	Easy
244	shortest-word-distance-ii	🔒	📝	Medium
245	shortest-word-distance-iii	🔒		Medium
246	strobogrammatic-number	🔒	📝	Easy
247	strobogrammatic-number-ii	🔒	📝	Medium
248	strobogrammatic-number-iii	🔒		Hard
249	group-shifted-strings	🔒	📝	Medium
250	count-univalue-subtrees	🔒	📝	Medium
251	flatten-2d-vector	🔒	📝	Medium
252	meeting-rooms	🔒	📝	Easy
253	meeting-rooms-ii	🔒	📝	Medium
254	factor-combinations	🔒		Medium
255	verify-preorder-sequence-in-binary-search-tree	🔒		Medium
256	paint-house	🔒	📝	Medium
257	binary-tree-paths		📝	Easy
258	add-digits	Python3	📝	Easy
259	3sum-smaller	🔒	📝	Medium
260	single-number-iii		📝	Medium
261	graph-valid-tree	🔒	📝	Medium
263	ugly-number			Easy
264	ugly-number-ii		📝	Medium
265	paint-house-ii	🔒	📝	Hard
266	palindrome-permutation	🔒	📝	Easy
267	palindrome-permutation-ii	🔒	📝	Medium
268	missing-number	Python3	📝	Easy
269	alien-dictionary	🔒	📝	Hard
270	closest-binary-search-tree-value	🔒	📝	Easy
271	encode-and-decode-strings	🔒	📝	Medium
272	closest-binary-search-tree-value-ii	🔒	📝	Hard
273	integer-to-english-words		📝	Hard
274	h-index		📝	Medium
275	h-index-ii		📝	Medium
276	paint-fence	🔒	📝	Medium
277	find-the-celebrity	🔒	📝	Medium
278	first-bad-version	Python3	📝	Easy
279	perfect-squares	Python3	📝	Medium
280	wiggle-sort	🔒	📝	Medium
281	zigzag-iterator	🔒	📝	Medium
282	expression-add-operators	Python3	📝	Hard
283	move-zeroes	Python3	📝	Easy
284	peeking-iterator		📝	Medium
285	inorder-successor-in-bst	🔒	📝	Medium
286	walls-and-gates	🔒	📝	Medium
287	find-the-duplicate-number	Python3	📝	Medium
288	unique-word-abbreviation	🔒	📝	Medium
289	game-of-life		📝	Medium
290	word-pattern		📝	Easy
291	word-pattern-ii	🔒		Medium
292	nim-game	Python3	📝	Easy
293	flip-game	🔒		Easy
294	flip-game-ii	🔒		Medium
295	find-median-from-data-stream	Python3	📝	Hard
296	best-meeting-point	🔒	📝	Hard
297	serialize-and-deserialize-binary-tree		📝	Hard
298	binary-tree-longest-consecutive-sequence	🔒	📝	Medium
299	bulls-and-cows		📝	Medium
300	longest-increasing-subsequence	Python3	📝	Medium
301	remove-invalid-parentheses		📝	Hard
302	smallest-rectangle-enclosing-black-pixels	🔒	📝	Hard
303	range-sum-query-immutable		📝	Easy
304	range-sum-query-2d-immutable		📝	Medium
305	number-of-islands-ii	🔒	📝	Hard
306	additive-number			Medium
307	range-sum-query-mutable	Python3	📝	Medium
308	range-sum-query-2d-mutable	🔒	📝	Hard
309	best-time-to-buy-and-sell-stock-with-cooldown	Python3	📝	Medium
310	minimum-height-trees		📝	Medium
311	sparse-matrix-multiplication	🔒	📝	Medium
312	burst-balloons		📝	Hard
313	super-ugly-number			Medium
314	binary-tree-vertical-order-traversal	🔒	📝	Medium
315	count-of-smaller-numbers-after-self		📝	Hard
316	remove-duplicate-letters	Python3	📝	Medium
317	shortest-distance-from-all-buildings	🔒	📝	Hard
318	maximum-product-of-word-lengths	Python3	📝	Medium
319	bulb-switcher			Medium
320	generalized-abbreviation	🔒	📝	Medium
321	create-maximum-number			Hard
322	coin-change		📝	Medium
323	number-of-connected-components-in-an-undirected-graph	🔒	📝	Medium
324	wiggle-sort-ii			Medium
325	maximum-size-subarray-sum-equals-k	🔒	📝	Medium
326	power-of-three	Python3	📝	Easy
327	count-of-range-sum			Hard
328	odd-even-linked-list	Python3	📝	Medium
329	longest-increasing-path-in-a-matrix		📝	Hard
330	patching-array		📝	Hard
331	verify-preorder-serialization-of-a-binary-tree	Python3	📝	Medium
332	reconstruct-itinerary	Python3	📝	Hard
333	largest-bst-subtree	🔒	📝	Medium
334	increasing-triplet-subsequence		📝	Medium
335	self-crossing			Hard
336	palindrome-pairs		📝	Hard
337	house-robber-iii	Python3	📝	Medium
338	counting-bits	Python3	📝	Easy
339	nested-list-weight-sum	🔒	📝	Medium
340	longest-substring-with-at-most-k-distinct-characters	🔒	📝	Medium
341	flatten-nested-list-iterator		📝	Medium
342	power-of-four	Python3	📝	Easy
343	integer-break			Medium
344	reverse-string	Python3	📝	Easy
345	reverse-vowels-of-a-string		📝	Easy
346	moving-average-from-data-stream	🔒	📝	Easy
347	top-k-frequent-elements		📝	Medium
348	design-tic-tac-toe	🔒	📝	Medium
349	intersection-of-two-arrays		📝	Easy
350	intersection-of-two-arrays-ii	Python3	📝	Easy
351	android-unlock-patterns	🔒	📝	Medium
352	data-stream-as-disjoint-intervals			Hard
353	design-snake-game	🔒	📝	Medium
354	russian-doll-envelopes		📝	Hard
355	design-twitter			Medium
356	line-reflection	🔒		Medium
357	count-numbers-with-unique-digits			Medium
358	rearrange-string-k-distance-apart	🔒		Hard
359	logger-rate-limiter	🔒	📝	Easy
360	sort-transformed-array	🔒		Medium
361	bomb-enemy	🔒	📝	Medium
362	design-hit-counter	🔒	📝	Medium
363	max-sum-of-rectangle-no-larger-than-k		📝	Hard
364	nested-list-weight-sum-ii	🔒	📝	Medium
365	water-and-jug-problem			Medium
366	find-leaves-of-binary-tree	🔒	📝	Medium
367	valid-perfect-square		📝	Easy
368	largest-divisible-subset	Python3	📝	Medium
369	plus-one-linked-list	🔒	📝	Medium
370	range-addition	🔒	📝	Medium
371	sum-of-two-integers		📝	Medium
372	super-pow			Medium
373	find-k-pairs-with-smallest-sums			Medium
374	guess-number-higher-or-lower	Python3	📝	Easy
375	guess-number-higher-or-lower-ii		📝	Medium
376	wiggle-subsequence	Python3	📝	Medium
377	combination-sum-iv	Python3	📝	Medium
378	kth-smallest-element-in-a-sorted-matrix	Python3	📝	Medium
379	design-phone-directory	🔒		Medium
380	insert-delete-getrandom-o1	Python3	📝	Medium
381	insert-delete-getrandom-o1-duplicates-allowed		📝	Hard
382	linked-list-random-node		📝	Medium
383	ransom-note	Python3	📝	Easy
384	shuffle-an-array	Python3	📝	Medium
385	mini-parser			Medium
386	lexicographical-numbers			Medium
387	first-unique-character-in-a-string	Python3	📝	Easy
388	longest-absolute-file-path			Medium
389	find-the-difference	Python3	📝	Easy
390	elimination-game			Medium
391	perfect-rectangle			Hard
392	is-subsequence	Python3	📝	Easy
393	utf-8-validation		📝	Medium
394	decode-string	Python3	📝	Medium
395	longest-substring-with-at-least-k-repeating-characters		📝	Medium
396	rotate-function			Medium
397	integer-replacement			Medium
398	random-pick-index		📝	Medium
399	evaluate-division		📝	Medium
400	nth-digit			Medium
401	binary-watch			Easy
402	remove-k-digits	Python3	📝	Medium
403	frog-jump		📝	Hard
404	sum-of-left-leaves	Python3	📝	Easy
405	convert-a-number-to-hexadecimal			Easy
406	queue-reconstruction-by-height	Python3	📝	Medium
407	trapping-rain-water-ii			Hard
408	valid-word-abbreviation	🔒		Easy
409	longest-palindrome		📝	Easy
410	split-array-largest-sum		📝	Hard
411	minimum-unique-word-abbreviation	🔒		Hard
412	fizz-buzz		📝	Easy
413	arithmetic-slices	Python3	📝	Medium
414	third-maximum-number		📝	Easy
415	add-strings		📝	Easy
416	partition-equal-subset-sum	Python3	📝	Medium
417	pacific-atlantic-water-flow	Python3	📝	Medium
418	sentence-screen-fitting	🔒		Medium
419	battleships-in-a-board			Medium
420	strong-password-checker			Hard
421	maximum-xor-of-two-numbers-in-an-array		📝	Medium
422	valid-word-square	🔒		Easy
423	reconstruct-original-digits-from-english		📝	Medium
424	longest-repeating-character-replacement			Medium
425	word-squares	🔒	📝	Hard
432	all-oone-data-structure			Hard
433	minimum-genetic-mutation			Medium
434	number-of-segments-in-a-string		📝	Easy
435	non-overlapping-intervals		📝	Medium
436	find-right-interval		📝	Medium
437	path-sum-iii	Python3	📝	Medium
438	find-all-anagrams-in-a-string		📝	Medium
439	ternary-expression-parser	🔒		Medium
440	k-th-smallest-in-lexicographical-order			Hard
441	arranging-coins	Python3	📝	Easy
442	find-all-duplicates-in-an-array	Python3	📝	Medium
443	string-compression		📝	Medium
444	sequence-reconstruction	🔒		Medium
445	add-two-numbers-ii		📝	Medium
446	arithmetic-slices-ii-subsequence	Python3	📝	Hard
447	number-of-boomerangs			Medium
448	find-all-numbers-disappeared-in-an-array	Python3	📝	Easy
449	serialize-and-deserialize-bst		📝	Medium
450	delete-node-in-a-bst	Python3	📝	Medium
451	sort-characters-by-frequency	Python3	📝	Medium
452	minimum-number-of-arrows-to-burst-balloons	Python3	📝	Medium
453	minimum-moves-to-equal-array-elements		📝	Medium
454	4sum-ii		📝	Medium
455	assign-cookies			Easy
456	132-pattern		📝	Medium
457	circular-array-loop			Medium
458	poor-pigs		📝	Hard
459	repeated-substring-pattern		📝	Easy
460	lfu-cache			Hard
461	hamming-distance	Python3	📝	Easy
462	minimum-moves-to-equal-array-elements-ii	Python3	📝	Medium
463	island-perimeter	Python3	📝	Easy
464	can-i-win			Medium
465	optimal-account-balancing	🔒		Hard
466	count-the-repetitions		📝	Hard
467	unique-substrings-in-wraparound-string			Medium
468	validate-ip-address	Python3	📝	Medium
469	convex-polygon	🔒		Medium
471	encode-string-with-shortest-length	🔒		Hard
472	concatenated-words			Hard
473	matchsticks-to-square	Python3	📝	Medium
474	ones-and-zeroes		📝	Medium
475	heaters			Medium
476	number-complement		📝	Easy
477	total-hamming-distance		📝	Medium
479	largest-palindrome-product			Hard
480	sliding-window-median		📝	Hard
481	magical-string			Medium
482	license-key-formatting			Easy
483	smallest-good-base			Hard
484	find-permutation	🔒	📝	Medium
485	max-consecutive-ones	Python3	📝	Easy
486	predict-the-winner		📝	Medium
487	max-consecutive-ones-ii	🔒	📝	Medium
488	zuma-game			Hard
489	kth-smallest-instructions			Hard
490	the-maze	🔒	📝	Medium
491	increasing-subsequences			Medium
492	construct-the-rectangle			Easy
493	reverse-pairs		📝	Hard
494	target-sum		📝	Medium
495	teemo-attacking		📝	Easy
496	next-greater-element-i	Python3	📝	Easy
498	diagonal-traverse		📝	Medium
499	the-maze-iii	🔒		Hard
500	keyboard-row			Easy
501	find-mode-in-binary-search-tree			Easy
502	ipo		📝	Hard
503	next-greater-element-ii		📝	Medium
504	base-7			Easy
505	the-maze-ii	🔒	📝	Medium
506	relative-ranks			Easy
507	perfect-number		📝	Easy
508	most-frequent-subtree-sum			Medium
509	inorder-successor-in-bst-ii	🔒	📝	Medium
510	count-subarrays-with-more-ones-than-zeros	🔒		Medium
511	all-paths-from-source-lead-to-destination	🔒	📝	Medium
512	maximum-alternating-subarray-sum	🔒		Medium
513	find-bottom-left-tree-value			Medium
514	freedom-trail			Hard
515	find-largest-value-in-each-tree-row			Medium
516	longest-palindromic-subsequence			Medium
517	super-washing-machines		📝	Hard
518	coin-change-2	Python3	📝	Medium
519	widest-pair-of-indices-with-equal-range-sum	🔒		Medium
520	detect-capital		📝	Easy
521	longest-uncommon-subsequence-i		📝	Easy
522	longest-uncommon-subsequence-ii	Python3	📝	Medium
523	continuous-subarray-sum		📝	Medium
524	longest-word-in-dictionary-through-deleting		📝	Medium
525	contiguous-array		📝	Medium
526	beautiful-arrangement		📝	Medium
527	word-abbreviation	🔒	📝	Hard
528	swapping-nodes-in-a-linked-list		📝	Medium
529	minesweeper			Medium
530	minimum-absolute-difference-in-bst			Easy
531	lonely-pixel-i	🔒	📝	Medium
532	k-diff-pairs-in-an-array	Python3	📝	Medium
533	lonely-pixel-ii	🔒		Medium
535	encode-and-decode-tinyurl		📝	Medium
536	construct-binary-tree-from-string	🔒	📝	Medium
537	complex-number-multiplication		📝	Medium
538	convert-bst-to-greater-tree	Python3	📝	Medium
539	minimum-time-difference			Medium
540	single-element-in-a-sorted-array	Python3	📝	Medium
541	reverse-string-ii		📝	Easy
542	01-matrix		📝	Medium
543	diameter-of-binary-tree	Python3	📝	Easy
544	output-contest-matches	🔒	📝	Medium
545	boundary-of-binary-tree	🔒	📝	Medium
546	remove-boxes	Python3	📝	Hard
547	number-of-provinces		📝	Medium
548	split-array-with-equal-sum	🔒	📝	Hard
549	binary-tree-longest-consecutive-sequence-ii	🔒	📝	Medium
550	shortest-path-to-get-food	🔒		Medium
551	student-attendance-record-i		📝	Easy
552	student-attendance-record-ii		📝	Hard
553	optimal-division		📝	Medium
554	brick-wall		📝	Medium
555	split-concatenated-strings	🔒	📝	Medium
556	next-greater-element-iii		📝	Medium
557	reverse-words-in-a-string-iii	Python3	📝	Easy
560	subarray-sum-equals-k	Python3	📝	Medium
561	array-partition		📝	Easy
562	longest-line-of-consecutive-one-in-matrix	🔒	📝	Medium
563	binary-tree-tilt	Python3	📝	Easy
564	find-the-closest-palindrome		📝	Hard
565	array-nesting		📝	Medium
566	reshape-the-matrix		📝	Easy
567	permutation-in-string	Python3	📝	Medium
568	maximum-vacation-days	🔒	📝	Hard
572	subtree-of-another-tree		📝	Easy
573	squirrel-simulation	🔒	📝	Medium
575	distribute-candies	Python3	📝	Easy
576	out-of-boundary-paths	Python3	📝	Medium
581	shortest-unsorted-continuous-subarray	Python3	📝	Medium
582	kill-process	🔒	📝	Medium
583	delete-operation-for-two-strings	Python3	📝	Medium
587	erect-the-fence		📝	Hard
588	design-in-memory-file-system	🔒	📝	Hard
591	tag-validator		📝	Hard
592	fraction-addition-and-subtraction		📝	Medium
593	valid-square		📝	Medium
594	longest-harmonious-subsequence		📝	Easy
598	range-addition-ii		📝	Easy
599	minimum-index-sum-of-two-lists		📝	Easy
600	non-negative-integers-without-consecutive-ones		📝	Hard
604	design-compressed-string-iterator	🔒	📝	Easy
605	can-place-flowers		📝	Easy
606	construct-string-from-binary-tree		📝	Easy
609	find-duplicate-file-in-system		📝	Medium
611	valid-triangle-number	Python3	📝	Medium
616	add-bold-tag-in-string	🔒	📝	Medium
617	merge-two-binary-trees		📝	Easy
621	task-scheduler		📝	Medium
623	add-one-row-to-tree		📝	Medium
624	maximum-distance-in-arrays	🔒	📝	Medium
625	minimum-factorization	🔒	📝	Medium
628	maximum-product-of-three-numbers		📝	Easy
629	k-inverse-pairs-array		📝	Hard
630	course-schedule-iii	Python3	📝	Hard
631	design-excel-sum-formula	🔒	📝	Hard
632	smallest-range-covering-elements-from-k-lists		📝	Hard
633	sum-of-square-numbers	Python3	📝	Medium
634	find-the-derangement-of-an-array	🔒	📝	Medium
635	design-log-storage-system	🔒	📝	Medium
636	exclusive-time-of-functions		📝	Medium
637	average-of-levels-in-binary-tree		📝	Easy
638	shopping-offers		📝	Medium
639	decode-ways-ii	Python3	📝	Hard
640	solve-the-equation		📝	Medium
642	design-search-autocomplete-system	🔒	📝	Hard
643	maximum-average-subarray-i		📝	Easy
644	maximum-average-subarray-ii	🔒	📝	Hard
645	set-mismatch		📝	Easy
646	maximum-length-of-pair-chain		📝	Medium
647	palindromic-substrings	Python3	📝	Medium
648	replace-words		📝	Medium
649	dota2-senate		📝	Medium
650	2-keys-keyboard		📝	Medium
651	4-keys-keyboard	🔒	📝	Medium
652	find-duplicate-subtrees		📝	Medium
653	two-sum-iv-input-is-a-bst		📝	Easy
654	maximum-binary-tree		📝	Medium
655	print-binary-tree		📝	Medium
656	coin-path	🔒	📝	Hard
657	robot-return-to-origin		📝	Easy
658	find-k-closest-elements		📝	Medium
659	split-array-into-consecutive-subsequences		📝	Medium
660	remove-9	🔒	📝	Hard
661	image-smoother		📝	Easy
662	maximum-width-of-binary-tree		📝	Medium
663	equal-tree-partition	🔒	📝	Medium
664	strange-printer		📝	Hard
665	non-decreasing-array	Python3	📝	Medium
666	path-sum-iv	🔒	📝	Medium
667	beautiful-arrangement-ii		📝	Medium
668	kth-smallest-number-in-multiplication-table	Python3	📝	Hard
669	trim-a-binary-search-tree	Python3	📝	Medium
670	maximum-swap		📝	Medium
671	second-minimum-node-in-a-binary-tree		📝	Easy
672	bulb-switcher-ii		📝	Medium
673	number-of-longest-increasing-subsequence		📝	Medium
674	longest-continuous-increasing-subsequence		📝	Easy
675	cut-off-trees-for-golf-event		📝	Hard
676	implement-magic-dictionary		📝	Medium
677	map-sum-pairs		📝	Medium
678	valid-parenthesis-string		📝	Medium
679	24-game		📝	Hard
680	valid-palindrome-ii		📝	Easy
681	next-closest-time	🔒	📝	Medium
682	baseball-game		📝	Easy
683	k-empty-slots	🔒	📝	Hard
684	redundant-connection		📝	Medium
685	redundant-connection-ii		📝	Hard
686	repeated-string-match		📝	Medium
687	longest-univalue-path		📝	Medium
688	knight-probability-in-chessboard		📝	Medium
689	maximum-sum-of-3-non-overlapping-subarrays		📝	Hard
690	employee-importance		📝	Medium
691	stickers-to-spell-word		📝	Hard
692	top-k-frequent-words		📝	Medium
693	binary-number-with-alternating-bits		📝	Easy
694	number-of-distinct-islands	🔒	📝	Medium
695	max-area-of-island	Python3	📝	Medium
696	count-binary-substrings		📝	Easy
697	degree-of-an-array		📝	Easy
698	partition-to-k-equal-sum-subsets	Python3	📝	Medium
699	falling-squares		📝	Hard
711	number-of-distinct-islands-ii	🔒	📝	Hard
712	minimum-ascii-delete-sum-for-two-strings		📝	Medium
713	subarray-product-less-than-k		📝	Medium
714	best-time-to-buy-and-sell-stock-with-transaction-fee		📝	Medium
715	range-module		📝	Hard
716	max-stack	🔒	📝	Hard
717	1-bit-and-2-bit-characters		📝	Easy
718	maximum-length-of-repeated-subarray	Python3	📝	Medium
719	find-k-th-smallest-pair-distance		📝	Hard
720	longest-word-in-dictionary		📝	Medium
721	accounts-merge	Python3	📝	Medium
722	remove-comments		📝	Medium
723	candy-crush	🔒	📝	Medium
724	find-pivot-index		📝	Easy
725	split-linked-list-in-parts	Python3	📝	Medium
726	number-of-atoms		📝	Hard
727	minimum-window-subsequence	🔒	📝	Hard
728	self-dividing-numbers		📝	Easy
729	my-calendar-i	Python3	📝	Medium
730	count-different-palindromic-subsequences		📝	Hard
731	my-calendar-ii		📝	Medium
732	my-calendar-iii		📝	Hard
733	flood-fill		📝	Easy
734	sentence-similarity	🔒	📝	Easy
735	asteroid-collision		📝	Medium
736	parse-lisp-expression		📝	Hard
737	sentence-similarity-ii	🔒	📝	Medium
738	monotone-increasing-digits		📝	Medium
739	daily-temperatures		📝	Medium
740	delete-and-earn	Python3	📝	Medium
741	cherry-pickup		📝	Hard
742	to-lower-case		📝	Easy
743	closest-leaf-in-a-binary-tree	🔒	📝	Medium
744	network-delay-time	Python3	📝	Medium
745	find-smallest-letter-greater-than-target		📝	Easy
746	prefix-and-suffix-search	Python3	📝	Hard
747	min-cost-climbing-stairs	Python3	📝	Easy
748	largest-number-at-least-twice-of-others		📝	Easy
749	shortest-completing-word		📝	Easy
750	contain-virus		📝	Hard
751	number-of-corner-rectangles	🔒	📝	Medium
752	ip-to-cidr	🔒	📝	Medium
753	open-the-lock		📝	Medium
754	cracking-the-safe		📝	Hard
755	reach-a-number		📝	Medium
756	pour-water	🔒	📝	Medium
757	pyramid-transition-matrix		📝	Medium
758	convert-binary-search-tree-to-sorted-doubly-linked-list	🔒	📝	Medium
759	set-intersection-size-at-least-two		📝	Hard
760	bold-words-in-string	🔒	📝	Medium
761	employee-free-time	🔒	📝	Hard
762	find-anagram-mappings	🔒	📝	Easy
763	special-binary-string		📝	Hard
764	n-ary-tree-level-order-traversal	Python3	📝	Medium
765	serialize-and-deserialize-n-ary-tree	🔒	📝	Hard
766	flatten-a-multilevel-doubly-linked-list	Python3	📝	Medium
767	prime-number-of-set-bits-in-binary-representation		📝	Easy
768	partition-labels		📝	Medium
769	largest-plus-sign	Python3	📝	Medium
770	couples-holding-hands		📝	Hard
771	encode-n-ary-tree-to-binary-tree	🔒	📝	Hard
772	construct-quad-tree			Medium
773	logical-or-of-two-binary-grids-represented-as-quad-trees			Medium
774	maximum-depth-of-n-ary-tree		📝	Easy
775	n-ary-tree-preorder-traversal	Python3	📝	Easy
776	n-ary-tree-postorder-traversal		📝	Easy
777	toeplitz-matrix		📝	Easy
778	reorganize-string		📝	Medium
779	max-chunks-to-make-sorted-ii		📝	Hard
780	max-chunks-to-make-sorted		📝	Medium
781	basic-calculator-iv		📝	Hard
782	jewels-and-stones		📝	Easy
783	search-in-a-binary-search-tree	Python3	📝	Easy
784	insert-into-a-binary-search-tree	Python3	📝	Medium
785	basic-calculator-iii	🔒		Hard
786	search-in-a-sorted-array-of-unknown-size	🔒	📝	Medium
787	sliding-puzzle		📝	Hard
788	minimize-max-distance-to-gas-station	🔒	📝	Hard
789	kth-largest-element-in-a-stream		📝	Easy
790	global-and-local-inversions		📝	Medium
791	split-bst	🔒	📝	Medium
792	binary-search	Python3	📝	Easy
793	swap-adjacent-in-lr-string		📝	Medium
794	swim-in-rising-water		📝	Hard
795	k-th-symbol-in-grammar		📝	Medium
796	reaching-points		📝	Hard
797	rabbits-in-forest		📝	Medium
798	transform-to-chessboard		📝	Hard
799	minimum-distance-between-bst-nodes		📝	Easy
800	letter-case-permutation	Python3	📝	Medium
801	is-graph-bipartite	Python3	📝	Medium
802	k-th-smallest-prime-fraction		📝	Medium
803	cheapest-flights-within-k-stops	Python3	📝	Medium
804	rotated-digits		📝	Medium
805	escape-the-ghosts		📝	Medium
806	domino-and-tromino-tiling		📝	Medium
807	custom-sort-string	Python3	📝	Medium
808	number-of-matching-subsequences		📝	Medium
809	preimage-size-of-factorial-zeroes-function		📝	Hard
810	valid-tic-tac-toe-state		📝	Medium
811	number-of-subarrays-with-bounded-maximum		📝	Medium
812	rotate-string		📝	Easy
813	all-paths-from-source-to-target	Python3	📝	Medium
814	smallest-rotation-with-highest-score		📝	Hard
815	champagne-tower		📝	Medium
816	design-hashset		📝	Easy
817	design-hashmap		📝	Easy
818	similar-rgb-color	🔒	📝	Easy
819	minimum-swaps-to-make-sequences-increasing		📝	Hard
820	find-eventual-safe-states		📝	Medium
821	bricks-falling-when-hit		📝	Hard
822	unique-morse-code-words		📝	Easy
823	split-array-with-same-average		📝	Hard
824	number-of-lines-to-write-string		📝	Easy
825	max-increase-to-keep-city-skyline		📝	Medium
826	soup-servings		📝	Medium
827	expressive-words		📝	Medium
828	chalkboard-xor-game		📝	Hard
829	subdomain-visit-count		📝	Medium
830	largest-triangle-area		📝	Easy
831	largest-sum-of-averages		📝	Medium
832	binary-tree-pruning		📝	Medium
833	bus-routes		📝	Hard
834	ambiguous-coordinates		📝	Medium
835	linked-list-components		📝	Medium
836	race-car		📝	Hard
837	most-common-word		📝	Easy
838	design-linked-list		📝	Medium
839	short-encoding-of-words	Python3	📝	Medium
841	shortest-distance-to-a-character	Python3	📝	Easy
842	card-flipping-game		📝	Medium
843	binary-trees-with-factors	Python3	📝	Medium
850	insert-into-a-sorted-circular-linked-list	🔒	📝	Medium
851	goat-latin		📝	Easy
852	friends-of-appropriate-ages		📝	Medium
853	most-profit-assigning-work		📝	Medium
854	making-a-large-island		📝	Hard
855	count-unique-characters-of-all-substrings-of-a-given-string		📝	Hard
856	consecutive-numbers-sum		📝	Hard
857	positions-of-large-groups		📝	Easy
858	masking-personal-information		📝	Medium
859	design-circular-deque			Medium
860	design-circular-queue		📝	Medium
861	flipping-an-image		📝	Easy
862	find-and-replace-in-string		📝	Medium
863	sum-of-distances-in-tree	Python3	📝	Hard
864	image-overlap		📝	Medium
865	robot-room-cleaner	🔒	📝	Hard
866	rectangle-overlap		📝	Easy
867	new-21-game		📝	Medium
868	push-dominoes		📝	Medium
869	similar-string-groups		📝	Hard
870	magic-squares-in-grid		📝	Medium
871	keys-and-rooms		📝	Medium
872	split-array-into-fibonacci-sequence		📝	Medium
873	guess-the-word			Hard
874	backspace-string-compare		📝	Easy
875	longest-mountain-in-array		📝	Medium
876	hand-of-straights		📝	Medium
877	shortest-path-visiting-all-nodes	Python3	📝	Hard
878	shifting-letters		📝	Medium
879	maximize-distance-to-closest-person		📝	Medium
880	rectangle-area-ii	Python3	📝	Hard
881	loud-and-rich		📝	Medium
882	peak-index-in-a-mountain-array		📝	Medium
883	car-fleet		📝	Medium
884	k-similar-strings		📝	Hard
885	exam-room		📝	Medium
886	score-of-parentheses	Python3	📝	Medium
887	minimum-cost-to-hire-k-workers		📝	Hard
888	mirror-reflection		📝	Medium
889	buddy-strings	Python3	📝	Easy
890	lemonade-change		📝	Easy
891	score-after-flipping-matrix		📝	Medium
892	shortest-subarray-with-sum-at-least-k		📝	Hard
893	all-nodes-distance-k-in-binary-tree		📝	Medium
894	random-pick-with-blacklist		📝	Hard
895	shortest-path-to-get-all-keys		📝	Hard
896	smallest-subtree-with-all-the-deepest-nodes		📝	Medium
897	prime-palindrome		📝	Medium
898	transpose-matrix		📝	Easy
899	binary-gap		📝	Easy
900	reordered-power-of-2		📝	Medium
901	advantage-shuffle		📝	Medium
902	minimum-number-of-refueling-stops		📝	Hard
903	implement-rand10-using-rand7		📝	Medium
904	leaf-similar-trees	Python3	📝	Easy
905	length-of-longest-fibonacci-subsequence		📝	Medium
906	walking-robot-simulation		📝	Medium
907	koko-eating-bananas	Python3	📝	Medium
908	middle-of-the-linked-list		📝	Easy
909	stone-game	Python3	📝	Medium
910	nth-magical-number	Python3	📝	Hard
911	profitable-schemes		📝	Hard
912	random-pick-with-weight	Python3	📝	Medium
913	random-flip-matrix		📝	Medium
914	random-point-in-non-overlapping-rectangles		📝	Medium
915	generate-random-point-in-a-circle		📝	Medium
916	decoded-string-at-index		📝	Medium
917	boats-to-save-people	Python3	📝	Medium
918	reachable-nodes-in-subdivided-graph		📝	Hard
919	projection-area-of-3d-shapes		📝	Easy
920	uncommon-words-from-two-sentences		📝	Easy
921	spiral-matrix-iii		📝	Medium
922	possible-bipartition		📝	Medium
923	super-egg-drop		📝	Hard
924	fair-candy-swap		📝	Easy
925	construct-binary-tree-from-preorder-and-postorder-traversal		📝	Medium
926	find-and-replace-pattern		📝	Medium
927	sum-of-subsequence-widths		📝	Hard
928	surface-area-of-3d-shapes		📝	Easy
929	groups-of-special-equivalent-strings		📝	Medium
930	all-possible-full-binary-trees		📝	Medium
931	maximum-frequency-stack		📝	Hard
932	monotonic-array		📝	Easy
933	increasing-order-search-tree		📝	Easy
934	bitwise-ors-of-subarrays		📝	Medium
935	orderly-queue		📝	Hard
936	rle-iterator		📝	Medium
937	online-stock-span		📝	Medium
938	numbers-at-most-n-given-digit-set	Python3	📝	Hard
939	valid-permutations-for-di-sequence		📝	Hard
940	fruit-into-baskets		📝	Medium
941	sort-array-by-parity		📝	Easy
942	super-palindromes		📝	Hard
943	sum-of-subarray-minimums		📝	Medium
944	smallest-range-i		📝	Easy
945	snakes-and-ladders		📝	Medium
946	smallest-range-ii		📝	Medium
947	online-election		📝	Medium
948	sort-an-array			Medium
949	cat-and-mouse		📝	Hard
950	x-of-a-kind-in-a-deck-of-cards		📝	Easy
951	partition-array-into-disjoint-intervals		📝	Medium
952	word-subsets	Python3	📝	Medium
953	reverse-only-letters	Python3	📝	Easy
954	maximum-sum-circular-subarray		📝	Medium
955	complete-binary-tree-inserter		📝	Medium
956	number-of-music-playlists		📝	Hard
957	minimum-add-to-make-parentheses-valid		📝	Medium
958	sort-array-by-parity-ii	Python3	📝	Easy
959	3sum-with-multiplicity		📝	Medium
960	minimize-malware-spread		📝	Hard
961	long-pressed-name		📝	Easy
962	flip-string-to-monotone-increasing		📝	Medium
963	three-equal-parts	Python3	📝	Hard
964	minimize-malware-spread-ii		📝	Hard
965	unique-email-addresses	Python3	📝	Easy
966	binary-subarrays-with-sum		📝	Medium
967	minimum-falling-path-sum		📝	Medium
968	beautiful-array		📝	Medium
969	number-of-recent-calls	Python3	📝	Easy
971	shortest-bridge		📝	Medium
972	knight-dialer		📝	Medium
973	stamping-the-sequence		📝	Hard
974	reorder-data-in-log-files		📝	Medium
975	range-sum-of-bst	Python3	📝	Easy
976	minimum-area-rectangle		📝	Medium
977	distinct-subsequences-ii		📝	Hard
978	valid-mountain-array		📝	Easy
979	di-string-match		📝	Easy
980	find-the-shortest-superstring		📝	Hard
981	delete-columns-to-make-sorted		📝	Easy
982	minimum-increment-to-make-array-unique		📝	Medium
983	validate-stack-sequences	Python3	📝	Medium
984	most-stones-removed-with-same-row-or-column		📝	Medium
985	bag-of-tokens		📝	Medium
986	largest-time-for-given-digits		📝	Medium
987	reveal-cards-in-increasing-order		📝	Medium
988	flip-equivalent-binary-trees		📝	Medium
989	largest-component-size-by-common-factor	Python3	📝	Hard
990	verifying-an-alien-dictionary		📝	Easy
991	array-of-doubled-pairs	Python3	📝	Medium
992	delete-columns-to-make-sorted-ii		📝	Medium
993	tallest-billboard		📝	Hard
994	prison-cells-after-n-days	Python3	📝	Medium
998	check-completeness-of-a-binary-tree		📝	Medium
999	regions-cut-by-slashes		📝	Medium
1000	delete-columns-to-make-sorted-iii		📝	Hard
1001	n-repeated-element-in-size-2n-array		📝	Easy
1002	maximum-width-ramp		📝	Medium
1003	minimum-area-rectangle-ii		📝	Medium
1004	least-operators-to-express-number		📝	Hard
1005	univalued-binary-tree		📝	Easy
1006	vowel-spellchecker		📝	Medium
1007	numbers-with-same-consecutive-differences	Python3	📝	Medium
1008	binary-tree-cameras		📝	Hard
1009	pancake-sorting		📝	Medium
1010	powerful-integers		📝	Medium
1011	flip-binary-tree-to-match-preorder-traversal		📝	Medium
1012	equal-rational-numbers		📝	Hard
1013	fibonacci-number	Python3	📝	Easy
1014	k-closest-points-to-origin		📝	Medium
1016	subarray-sums-divisible-by-k		📝	Medium
1017	odd-even-jump		📝	Hard
1018	largest-perimeter-triangle		📝	Easy
1019	squares-of-a-sorted-array	Python3	📝	Easy
1020	longest-turbulent-subarray	Python3	📝	Medium
1021	distribute-coins-in-binary-tree		📝	Medium
1022	unique-paths-iii	Python3	📝	Hard
1023	time-based-key-value-store		📝	Medium
1024	triples-with-bitwise-and-equal-to-zero			Hard
1025	minimum-cost-for-tickets		📝	Medium
1026	string-without-aaa-or-bbb		📝	Medium
1027	sum-of-even-numbers-after-queries		📝	Medium
1028	interval-list-intersections	Python3	📝	Medium
1029	vertical-order-traversal-of-a-binary-tree		📝	Hard
1030	smallest-string-starting-from-leaf		📝	Medium
1031	add-to-array-form-of-integer		📝	Easy
1032	satisfiability-of-equality-equations		📝	Medium
1033	broken-calculator	Python3	📝	Medium
1034	subarrays-with-k-different-integers		📝	Hard
1035	cousins-in-binary-tree	Python3	📝	Easy
1036	rotting-oranges	Python3	📝	Medium
1037	minimum-number-of-k-consecutive-bit-flips		📝	Hard
1038	number-of-squareful-arrays		📝	Hard
1039	find-the-town-judge		📝	Easy
1040	maximum-binary-tree-ii			Medium
1041	available-captures-for-rook			Easy
1042	minimum-cost-to-merge-stones			Hard
1043	grid-illumination			Hard
1044	find-common-characters			Easy
1045	check-if-word-is-valid-after-substitutions			Medium
1046	max-consecutive-ones-iii		📝	Medium
1047	maximize-sum-of-array-after-k-negations			Easy
1048	clumsy-factorial			Medium
1049	minimum-domino-rotations-for-equal-row	Python3	📝	Medium
1050	construct-binary-search-tree-from-preorder-traversal	Python3	📝	Medium
1051	shortest-way-to-form-string	🔒		Medium
1052	campus-bikes	🔒	📝	Medium
1053	minimize-rounding-error-to-meet-target	🔒		Medium
1054	complement-of-base-10-integer	Python3	📝	Easy
1055	pairs-of-songs-with-total-durations-divisible-by-60	Python3	📝	Medium
1056	capacity-to-ship-packages-within-d-days			Medium
1057	numbers-with-repeated-digits			Hard
1058	lexicographically-smallest-equivalent-string	🔒		Medium
1059	missing-element-in-sorted-array	🔒	📝	Medium
1060	longest-repeating-substring	🔒	📝	Medium
1061	number-of-valid-subarrays	🔒		Hard
1062	partition-array-into-three-parts-with-equal-sum			Easy
1063	best-sightseeing-pair			Medium
1064	smallest-integer-divisible-by-k		📝	Medium
1065	binary-string-with-substrings-representing-1-to-n			Medium
1066	fixed-point	🔒	📝	Easy
1067	campus-bikes-ii	🔒	📝	Medium
1068	digit-count-in-range	🔒		Hard
1069	confusing-number	🔒		Easy
1070	convert-to-base-2			Medium
1071	binary-prefix-divisible-by-5			Easy
1072	next-greater-node-in-linked-list			Medium
1073	number-of-enclaves			Medium
1074	high-five	🔒	📝	Easy
1075	index-pairs-of-a-string	🔒		Easy
1076	brace-expansion	🔒	📝	Medium
1077	confusing-number-ii	🔒		Hard
1078	remove-outermost-parentheses	Python3		Easy
1079	sum-of-root-to-leaf-binary-numbers	Python3	📝	Easy
1080	camelcase-matching			Medium
1081	video-stitching			Medium
1082	sum-of-digits-in-the-minimum-number	🔒		Easy
1083	two-sum-less-than-k	🔒	📝	Easy
1084	find-k-length-substrings-with-no-repeated-characters	🔒	📝	Medium
1085	the-earliest-moment-when-everyone-become-friends	🔒	📝	Medium
1086	divisor-game			Easy
1087	longest-arithmetic-subsequence			Medium
1088	number-of-days-in-a-month	🔒		Easy
1089	remove-vowels-from-a-string	🔒		Easy
1090	armstrong-number	🔒	📝	Easy
1091	maximum-average-subtree	🔒	📝	Medium
1092	maximum-difference-between-node-and-ancestor		📝	Medium
1093	recover-a-tree-from-preorder-traversal			Hard
1094	matrix-cells-in-distance-order			Easy
1095	two-city-scheduling	Python3	📝	Medium
1096	maximum-sum-of-two-non-overlapping-subarrays			Medium
1097	stream-of-characters	Python3	📝	Hard
1098	largest-unique-number	🔒	📝	Easy
1099	path-with-maximum-minimum-value	🔒	📝	Medium
1100	connecting-cities-with-minimum-cost	🔒	📝	Medium
1101	parallel-courses	🔒	📝	Medium
1102	check-if-a-number-is-majority-element-in-a-sorted-array	🔒		Easy
1103	moving-stones-until-consecutive			Medium
1104	coloring-a-border			Medium
1105	uncrossed-lines			Medium
1106	escape-a-large-maze			Hard
1107	minimum-swaps-to-group-all-1s-together	🔒	📝	Medium
1108	analyze-user-website-visit-pattern	🔒		Medium
1111	minimum-score-triangulation-of-polygon			Medium
1112	find-words-that-can-be-formed-by-characters			Easy
1113	moving-stones-until-consecutive-ii			Medium
1114	binary-search-tree-to-greater-sum-tree			Medium
1115	valid-boomerang			Easy
1116	maximum-level-sum-of-a-binary-tree		📝	Medium
1117	as-far-from-land-as-possible			Medium
1118	divide-array-into-increasing-sequences	🔒		Hard
1119	robot-bounded-in-circle		📝	Medium
1120	flower-planting-with-no-adjacent			Medium
1121	partition-array-for-maximum-sum			Medium
1122	longest-duplicate-substring	Python3	📝	Hard
1123	single-row-keyboard	🔒	📝	Easy
1124	string-transforms-into-another-string	🔒	📝	Hard
1125	design-file-system	🔒	📝	Medium
1126	minimum-cost-to-connect-sticks	🔒	📝	Medium
1127	last-stone-weight		📝	Easy
1128	remove-all-adjacent-duplicates-in-string		📝	Easy
1129	longest-string-chain		📝	Medium
1130	last-stone-weight-ii			Medium
1131	count-substrings-with-only-one-distinct-letter	🔒	📝	Easy
1132	before-and-after-puzzle	🔒		Medium
1133	last-substring-in-lexicographical-order			Hard
1134	shortest-distance-to-target-color	🔒	📝	Medium
1137	height-checker			Easy
1138	grumpy-bookstore-owner			Medium
1139	previous-permutation-with-one-swap			Medium
1140	distant-barcodes			Medium
1141	how-many-apples-can-you-put-into-the-basket	🔒	📝	Easy
1142	minimum-knight-moves	🔒	📝	Medium
1143	find-smallest-common-element-in-all-rows	🔒	📝	Medium
1144	optimize-water-distribution-in-a-village	🔒	📝	Hard
1145	number-of-submatrices-that-sum-to-target		📝	Hard
1146	greatest-common-divisor-of-strings			Easy
1147	flip-columns-for-maximum-number-of-equal-rows			Medium
1148	adding-two-negabinary-numbers			Medium
1149	intersection-of-three-sorted-arrays	🔒	📝	Easy
1150	two-sum-bsts	🔒	📝	Medium
1151	stepping-numbers	🔒		Medium
1152	maximum-number-of-ones	🔒		Hard
1156	occurrences-after-bigram			Easy
1157	insufficient-nodes-in-root-to-leaf-paths			Medium
1159	smallest-subsequence-of-distinct-characters			Medium
1160	letter-tile-possibilities			Medium
1164	missing-number-in-arithmetic-progression	🔒	📝	Easy
1165	meeting-scheduler	🔒	📝	Medium
1166	toss-strange-coins	🔒		Medium
1167	minimum-time-to-build-blocks	🔒		Hard
1168	duplicate-zeros		📝	Easy
1169	largest-values-from-labels			Medium
1170	shortest-common-supersequence			Hard
1171	shortest-path-in-binary-matrix	Python3	📝	Medium
1175	array-transformation	🔒		Easy
1176	design-a-leaderboard	🔒	📝	Medium
1177	tree-diameter	🔒	📝	Medium
1178	valid-palindrome-iii	🔒	📝	Hard
1183	statistics-from-a-large-sample			Medium
1184	car-pooling		📝	Medium
1185	find-in-mountain-array			Hard
1188	brace-expansion-ii			Hard
1189	encode-number	🔒		Medium
1190	smallest-common-region	🔒		Medium
1191	synonymous-sentences	🔒		Medium
1192	divide-chocolate	🔒	📝	Hard
1194	path-in-zigzag-labelled-binary-tree			Medium
1195	distribute-candies-to-people	Python3	📝	Easy
1196	filling-bookcase-shelves			Medium
1197	parsing-a-boolean-expression			Hard
1199	hexspeak	🔒		Easy
1200	remove-interval	🔒	📝	Medium
1201	delete-tree-nodes	🔒		Medium
1202	palindrome-removal	🔒		Hard
1205	defanging-an-ip-address			Easy
1206	corporate-flight-bookings			Medium
1207	delete-nodes-and-return-forest			Medium
1208	maximum-nesting-depth-of-two-valid-parentheses-strings			Medium
1210	mean-of-array-after-removing-some-elements			Easy
1211	iterator-for-combination	Python3	📝	Medium
1212	sequential-digits		📝	Medium
1213	handshakes-that-dont-cross	🔒		Hard
1217	relative-sort-array			Easy
1218	lowest-common-ancestor-of-deepest-leaves			Medium
1219	longest-well-performing-interval			Medium
1220	smallest-sufficient-team			Hard
1221	element-appearing-more-than-25-in-sorted-array			Easy
1222	remove-covered-intervals	Python3	📝	Medium
1223	graph-connectivity-with-threshold			Hard
1224	minimum-falling-path-sum-ii			Hard
1227	number-of-equivalent-domino-pairs			Easy
1228	minimum-cost-tree-from-leaf-values			Medium
1229	shortest-path-with-alternating-colors			Medium
1230	maximum-of-absolute-value-expression			Medium
1231	replace-elements-with-greatest-element-on-right-side			Easy
1232	sum-of-mutated-array-closest-to-target			Medium
1233	number-of-ships-in-a-rectangle	🔒	📝	Hard
1234	number-of-paths-with-max-score			Hard
1236	n-th-tribonacci-number	Python3	📝	Easy
1238	alphabet-board-path			Medium
1239	largest-1-bordered-square			Medium
1240	stone-game-ii	Python3		Medium
1241	decompress-run-length-encoded-list			Easy
1242	matrix-block-sum			Medium
1243	sum-of-nodes-with-even-valued-grandparent			Medium
1244	distinct-echo-substrings			Hard
1247	decrease-elements-to-make-array-zigzag			Medium
1248	binary-tree-coloring-game			Medium
1249	snapshot-array			Medium
1250	longest-common-subsequence	Python3	📝	Medium
1251	longest-chunked-palindrome-decomposition			Hard
1252	break-a-palindrome	Python3	📝	Medium
1253	sort-the-matrix-diagonally		📝	Medium
1254	deepest-leaves-sum	Python3	📝	Medium
1255	reverse-subarray-to-maximize-array-value			Hard
1256	rank-transform-of-an-array			Easy
1257	rank-transform-of-a-matrix	Python3	📝	Hard
1260	day-of-the-year			Easy
1261	swap-for-longest-repeated-character-substring			Medium
1262	online-majority-element-in-subarray			Hard
1263	number-of-dice-rolls-with-target-sum		📝	Medium
1264	maximum-number-of-words-you-can-type	Python3		Easy
1267	remove-zero-sum-consecutive-nodes-from-linked-list			Medium
1270	dinner-plate-stacks			Hard
1271	web-crawler	🔒		Medium
1272	invalid-transactions			Medium
1273	compare-strings-by-frequency-of-the-smallest-character			Medium
1274	number-of-days-between-two-dates			Easy
1275	validate-binary-tree-nodes			Medium
1276	closest-divisors			Medium
1277	largest-multiple-of-three			Hard
1279	prime-arrangements			Easy
1280	diet-plan-performance	🔒		Easy
1281	can-make-palindrome-from-substring			Medium
1282	number-of-valid-words-for-each-puzzle	Python3	📝	Hard
1283	reformat-date			Easy
1284	four-divisors			Medium
1285	balance-a-binary-search-tree			Medium
1286	constrained-subsequence-sum			Hard
1287	distance-between-bus-stops			Easy
1288	maximum-subarray-sum-with-one-deletion			Medium
1289	day-of-the-week			Easy
1290	make-array-strictly-increasing			Hard
1293	three-consecutive-odds			Easy
1294	range-frequency-queries	Python3		Medium
1295	minimum-garden-perimeter-to-collect-enough-apples			Medium
1296	kth-ancestor-of-a-tree-node			Hard
1297	maximum-number-of-balloons	Python3	📝	Easy
1298	reverse-substrings-between-each-pair-of-parentheses			Medium
1299	k-concatenation-maximum-sum			Medium
1300	critical-connections-in-a-network		📝	Hard
1302	delete-characters-to-make-fancy-string			Easy
1303	minimum-moves-to-reach-target-score			Medium
1304	longest-happy-string			Medium
1305	number-of-visible-people-in-a-queue			Hard
1306	minimum-absolute-difference		📝	Easy
1307	ugly-number-iii			Medium
1308	smallest-string-with-swaps		📝	Medium
1309	sort-items-by-groups-respecting-dependencies			Hard
1310	watering-plants	Python3		Medium
1311	largest-magic-square			Medium
1312	count-artifacts-that-can-be-extracted			Medium
1313	count-ways-to-build-rooms-in-an-ant-colony			Hard
1319	unique-number-of-occurrences			Easy
1320	remove-all-adjacent-duplicates-in-string-ii		📝	Medium
1321	get-equal-substrings-within-budget			Medium
1322	minimum-moves-to-reach-target-with-rotations			Hard
1324	where-will-the-ball-fall			Medium
1325	path-with-maximum-probability			Medium
1326	sum-of-floored-pairs			Hard
1329	minimum-cost-to-move-chips-to-the-same-position		📝	Easy
1330	longest-arithmetic-subsequence-of-given-difference			Medium
1331	path-with-maximum-gold			Medium
1332	count-vowels-permutation		📝	Hard
1333	sort-the-jumbled-numbers			Medium
1334	sum-of-numbers-with-units-digit-k			Medium
1335	maximum-candies-allocated-to-k-children			Medium
1336	maximum-product-of-the-length-of-two-palindromic-substrings			Hard
1337	design-skiplist			Hard
1341	split-a-string-in-balanced-strings			Easy
1342	queens-that-can-attack-the-king			Medium
1343	dice-roll-simulation			Hard
1344	maximum-equal-frequency			Hard
1345	perform-string-shifts	🔒	📝	Easy
1346	maximize-the-topmost-element-after-k-moves			Medium
1347	distance-to-a-cycle-in-undirected-graph	🔒		Hard
1348	maximum-score-of-spliced-array			Hard
1349	check-if-it-is-a-straight-line			Easy
1350	remove-sub-folders-from-the-filesystem			Medium
1351	replace-the-substring-for-balanced-string			Medium
1352	maximum-profit-in-job-scheduling		📝	Hard
1353	find-resultant-array-after-removing-anagrams			Easy
1354	find-players-with-zero-or-one-losses			Medium
1355	minimum-deletions-to-make-array-beautiful			Medium
1356	minimum-number-of-moves-to-make-palindrome			Hard
1358	find-positive-integer-solution-for-a-given-equation			Medium
1359	circular-permutation-in-binary-representation			Medium
1360	maximum-length-of-a-concatenated-string-with-unique-characters	Python3	📝	Medium
1361	tiling-a-rectangle-with-the-fewest-squares			Hard
1362	airplane-seat-assignment-probability			Medium
1363	greatest-english-letter-in-upper-and-lower-case			Easy
1364	tuple-with-same-product			Medium
1366	first-unique-number	🔒	📝	Medium
1367	maximum-height-by-stacking-cuboids			Hard
1369	minimum-swaps-to-make-strings-equal			Medium
1370	count-number-of-nice-subarrays			Medium
1371	minimum-remove-to-make-valid-parentheses		📝	Medium
1372	check-if-it-is-a-good-array			Hard
1374	leftmost-column-with-at-least-a-one	🔒	📝	Medium
1375	find-palindrome-with-fixed-length			Medium
1376	selling-pieces-of-wood			Hard
1378	cells-with-odd-values-in-a-matrix			Easy
1379	reconstruct-a-2-row-binary-matrix			Medium
1380	number-of-closed-islands			Medium
1381	maximum-score-words-formed-by-letters			Hard
1382	calculate-amount-paid-in-taxes			Easy
1383	number-of-single-divisor-triplets	🔒		Medium
1384	maximum-font-to-fit-a-sentence-in-a-screen	🔒		Medium
1385	number-of-ways-to-build-house-of-cards	🔒		Medium
1386	shift-2d-grid		📝	Easy
1387	find-elements-in-a-contaminated-binary-tree			Medium
1388	greatest-sum-divisible-by-three			Medium
1389	minimum-moves-to-move-a-box-to-their-target-location			Hard
1391	counting-elements	🔒	📝	Easy
1392	find-the-difference-of-two-arrays			Easy
1393	maximum-value-of-k-coins-from-piles			Hard
1394	minimum-path-cost-in-a-grid			Medium
1395	minimum-time-visiting-all-points			Easy
1396	count-servers-that-communicate			Medium
1397	search-suggestions-system	Python3	📝	Medium
1398	number-of-ways-to-stay-in-the-same-place-after-some-steps			Hard
1400	find-winner-on-a-tic-tac-toe-game	Python3	📝	Easy
1401	number-of-burgers-with-no-waste-of-ingredients			Medium
1402	count-square-submatrices-with-all-ones			Medium
1403	palindrome-partitioning-iii			Hard
1404	print-immutable-linked-list-in-reverse	🔒		Medium
1406	subtract-the-product-and-sum-of-digits-of-an-integer	Python3		Easy
1407	group-the-people-given-the-group-size-they-belong-to	Python3		Medium
1408	find-the-smallest-divisor-given-a-threshold	Python3	📝	Medium
1409	minimum-number-of-flips-to-convert-binary-matrix-to-zero-matrix			Hard
1411	convert-binary-number-in-a-linked-list-to-integer	Python3	📝	Easy
1413	maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold			Medium
1414	shortest-path-in-a-grid-with-obstacles-elimination	Python3	📝	Hard
1416	check-if-an-array-is-consecutive	🔒		Easy
1418	fair-distribution-of-cookies			Medium
1419	make-array-non-decreasing-or-non-increasing	🔒		Hard
1421	find-numbers-with-even-number-of-digits			Easy
1422	divide-array-in-sets-of-k-consecutive-numbers			Medium
1423	maximum-number-of-occurrences-of-a-substring			Medium
1424	maximum-candies-you-can-get-from-boxes			Hard
1426	find-n-unique-integers-sum-up-to-zero	Python3		Easy
1427	all-elements-in-two-binary-search-trees	Python3	📝	Medium
1428	jump-game-iii	Python3	📝	Medium
1429	verbal-arithmetic-puzzle			Hard
1430	find-the-k-beauty-of-a-number			Easy
1431	all-ancestors-of-a-node-in-a-directed-acyclic-graph			Medium
1432	check-if-a-string-is-a-valid-sequence-from-root-to-leaves-path-in-a-binary-tree	🔒		Medium
1433	encrypt-and-decrypt-strings			Hard
1434	decrypt-string-from-alphabet-to-integer-mapping			Easy
1435	xor-queries-of-a-subarray			Medium
1436	get-watched-videos-by-your-friends			Medium
1437	minimum-insertion-steps-to-make-a-string-palindrome			Hard
1440	convert-integer-to-the-sum-of-two-no-zero-integers			Easy
1441	minimum-flips-to-make-a-or-b-equal-to-c			Medium
1442	number-of-operations-to-make-network-connected			Medium
1443	minimum-distance-to-type-a-word-using-two-fingers			Hard
1444	number-of-steps-to-reduce-a-number-to-zero		📝	Easy
1445	number-of-sub-arrays-of-size-k-and-average-greater-than-or-equal-to-threshold			Medium
1446	angle-between-hands-of-a-clock		📝	Medium
1447	jump-game-iv		📝	Hard
1448	maximum-69-number			Easy
1449	print-words-vertically			Medium
1450	delete-leaves-with-a-given-value			Medium
1451	minimum-number-of-taps-to-open-to-water-a-garden			Hard
1454	remove-palindromic-subsequences		📝	Easy
1455	filter-restaurants-by-vegan-friendly-price-and-distance			Medium
1456	find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance			Medium
1457	minimum-difficulty-of-a-job-schedule		📝	Hard
1458	sort-integers-by-the-number-of-1-bits			Easy
1459	apply-discount-every-n-orders			Medium
1460	number-of-substrings-containing-all-three-characters			Medium
1461	count-all-valid-pickup-and-delivery-options		📝	Hard
1463	the-k-weakest-rows-in-a-matrix	Python3	📝	Easy
1464	reduce-array-size-to-the-half	Python3	📝	Medium
1465	maximum-product-of-splitted-binary-tree	Python3	📝	Medium
1466	jump-game-v			Hard
1468	check-if-n-and-its-double-exist			Easy
1469	minimum-number-of-steps-to-make-two-strings-anagram			Medium
1470	tweet-counts-per-frequency			Medium
1471	maximum-students-taking-exam			Hard
1472	increasing-decreasing-string			Easy
1473	find-the-longest-substring-containing-vowels-in-even-counts			Medium
1474	longest-zigzag-path-in-a-binary-tree			Medium
1475	maximum-sum-bst-in-binary-tree			Hard
1476	count-negative-numbers-in-a-sorted-matrix			Easy
1477	product-of-the-last-k-numbers			Medium
1478	maximum-number-of-events-that-can-be-attended			Medium
1479	construct-target-array-with-multiple-sums		📝	Hard
1482	how-many-numbers-are-smaller-than-the-current-number			Easy
1483	rank-teams-by-votes			Medium
1484	linked-list-in-binary-tree			Medium
1485	minimum-cost-to-make-at-least-one-valid-path-in-a-grid			Hard
1486	find-the-distance-value-between-two-arrays			Easy
1487	cinema-seat-allocation			Medium
1488	sort-integers-by-the-power-value			Medium
1489	pizza-with-3n-slices			Hard
1490	generate-a-string-with-characters-that-have-odd-counts			Easy
1491	number-of-times-binary-string-is-prefix-aligned			Medium
1492	time-needed-to-inform-all-employees			Medium
1493	frog-position-after-t-seconds			Hard
1496	lucky-numbers-in-a-matrix			Easy
1497	design-a-stack-with-increment-operation			Medium
1498	find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree	Python3	📝	Easy
1499	maximum-performance-of-a-team		📝	Hard
1500	count-largest-group			Easy
1501	circle-and-rectangle-overlapping			Medium
1502	construct-k-palindrome-strings			Medium
1503	reducing-dishes			Hard
1505	create-target-array-in-the-given-order			Easy
1507	check-if-there-is-a-valid-path-in-a-grid			Medium
1508	longest-happy-prefix			Hard
1510	find-lucky-integer-in-an-array		📝	Easy
1511	count-number-of-teams			Medium
1512	design-underground-system		📝	Medium
1513	find-all-good-strings			Hard
1514	minimum-value-to-get-positive-step-by-step-sum	Python3	📝	Easy
1515	find-the-minimum-number-of-fibonacci-numbers-whose-sum-is-k			Medium
1516	the-k-th-lexicographical-string-of-all-happy-strings-of-length-n			Medium
1517	restore-the-array			Hard
1519	minimum-subsequence-in-non-increasing-order			Easy
1520	number-of-steps-to-reduce-a-number-in-binary-representation-to-one			Medium
1522	stone-game-iii			Hard
1524	string-matching-in-an-array			Easy
1525	queries-on-a-permutation-with-key			Medium
1526	html-entity-parser			Medium
1527	number-of-ways-to-paint-n-3-grid			Hard
1528	kids-with-the-greatest-number-of-candies			Easy
1529	max-difference-you-can-get-from-changing-an-integer			Medium
1530	check-if-a-string-can-break-another-string			Medium
1531	number-of-ways-to-wear-different-hats-to-each-other			Hard
1532	reformat-the-string			Easy
1533	display-table-of-food-orders-in-a-restaurant			Medium
1534	minimum-number-of-frogs-croaking			Medium
1535	build-array-where-you-can-find-the-maximum-exactly-k-comparisons			Hard
1537	maximum-score-after-splitting-a-string			Easy
1538	maximum-points-you-can-obtain-from-cards	Python3	📝	Medium
1539	diagonal-traverse-ii			Medium
1542	consecutive-characters	Python3	📝	Easy
1543	simplified-fractions			Medium
1544	count-good-nodes-in-binary-tree	Python3	📝	Medium
1545	form-largest-integer-with-digits-that-add-up-to-target			Hard
1547	destination-city			Easy
1548	check-if-all-1s-are-at-least-length-k-places-away		📝	Easy
1549	longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit			Medium
1550	find-the-kth-smallest-sum-of-a-matrix-with-sorted-rows			Hard
1552	build-an-array-with-stack-operations			Medium
1553	count-triplets-that-can-form-two-arrays-of-equal-xor			Medium
1554	minimum-time-to-collect-all-apples-in-a-tree			Medium
1555	number-of-ways-of-cutting-a-pizza			Hard
1556	make-two-arrays-equal-by-reversing-sub-arrays			Easy
1557	check-if-a-string-contains-all-binary-codes-of-size-k	Python3	📝	Medium
1558	course-schedule-iv			Medium
1559	cherry-pickup-ii		📝	Hard
1560	number-of-students-doing-homework-at-a-given-time			Easy
1561	rearrange-words-in-a-sentence	Python3		Medium
1562	people-whose-list-of-favorite-companies-is-not-a-subset-of-another-list			Medium
1563	maximum-number-of-darts-inside-of-a-circular-dartboard			Hard
1566	check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence	Python3		Easy
1567	maximum-number-of-vowels-in-a-substring-of-given-length			Medium
1568	pseudo-palindromic-paths-in-a-binary-tree		📝	Medium
1569	max-dot-product-of-two-subsequences			Hard
1570	final-prices-with-a-special-discount-in-a-shop			Easy
1571	allocate-mailboxes			Hard
1572	subrectangle-queries	Python3		Medium
1573	find-two-non-overlapping-sub-arrays-each-with-target-sum			Medium
1574	maximum-product-of-two-elements-in-an-array	Python3		Easy
1575	maximum-area-of-a-piece-of-cake-after-horizontal-and-vertical-cuts	Python3	📝	Medium
1576	reorder-routes-to-make-all-paths-lead-to-the-city-zero	Python3		Medium
1577	probability-of-a-two-boxes-having-the-same-number-of-distinct-balls			Hard
1580	shuffle-the-array			Easy
1581	the-k-strongest-values-in-an-array			Medium
1582	design-browser-history			Medium
1583	paint-house-iii		📝	Hard
1584	average-salary-excluding-the-minimum-and-maximum-salary			Easy
1585	the-kth-factor-of-n		📝	Medium
1586	longest-subarray-of-1s-after-deleting-one-element			Medium
1587	parallel-courses-ii			Hard
1603	running-sum-of-1d-array	Python3	📝	Easy
1604	least-number-of-unique-integers-after-k-removals	Python3		Medium
1605	minimum-number-of-days-to-make-m-bouquets			Medium
1609	find-all-the-lonely-nodes	🔒		Easy
1610	xor-operation-in-an-array			Easy
1611	making-file-names-unique			Medium
1612	avoid-flood-in-the-city			Medium
1613	find-critical-and-pseudo-critical-edges-in-minimum-spanning-tree			Hard
1615	range-sum-of-sorted-subarray-sums			Medium
1616	minimum-difference-between-largest-and-smallest-value-in-three-moves			Medium
1617	stone-game-iv	Python3	📝	Hard
1618	delete-n-nodes-after-m-nodes-of-a-linked-list	🔒	📝	Easy
1619	path-crossing			Easy
1620	check-if-array-pairs-are-divisible-by-k			Medium
1621	number-of-subsequences-that-satisfy-the-given-sum-condition			Medium
1622	max-value-of-equation			Hard
1624	clone-binary-tree-with-random-pointer	🔒	📝	Medium
1626	can-make-arithmetic-progression-from-sequence			Easy
1627	last-moment-before-all-ants-fall-out-of-a-plank			Medium
1628	count-submatrices-with-all-ones			Medium
1629	minimum-possible-integer-after-at-most-k-adjacent-swaps-on-digits			Hard
1630	count-odd-numbers-in-an-interval-range			Easy
1631	number-of-sub-arrays-with-odd-sum			Medium
1632	number-of-good-ways-to-split-a-string			Medium
1633	minimum-number-of-increments-on-subarrays-to-form-a-target-array			Hard
1634	clone-n-ary-tree	🔒	📝	Medium
1635	number-of-good-pairs			Easy
1636	number-of-substrings-with-only-1s			Medium
1637	string-compression-ii		📝	Hard
1638	best-position-for-a-service-centre			Hard
1640	design-a-file-sharing-system	🔒		Medium
1642	water-bottles			Easy
1643	number-of-nodes-in-the-sub-tree-with-the-same-label			Medium
1644	maximum-number-of-non-overlapping-substrings			Hard
1645	find-a-value-of-a-mysterious-function-closest-to-target			Hard
1646	kth-missing-positive-number		📝	Easy
1647	can-convert-string-in-k-moves			Medium
1648	minimum-insertions-to-balance-a-parentheses-string			Medium
1649	maximum-number-of-non-overlapping-subarrays-with-sum-equals-target			Medium
1650	find-root-of-n-ary-tree	🔒	📝	Medium
1651	shuffle-string			Easy
1652	minimum-suffix-flips			Medium
1653	number-of-good-leaf-nodes-pairs			Medium
1655	move-sub-tree-of-n-ary-tree	🔒		Hard
1656	count-good-triplets			Easy
1657	find-the-winner-of-an-array-game			Medium
1658	minimum-swaps-to-arrange-a-binary-grid			Medium
1659	get-the-maximum-score			Hard
1660	thousand-separator			Easy
1661	minimum-number-of-vertices-to-reach-all-nodes			Medium
1662	minimum-numbers-of-function-calls-to-make-target-array			Medium
1663	detect-cycles-in-2d-grid			Medium
1665	diameter-of-n-ary-tree	🔒	📝	Medium
1666	make-the-string-great			Easy
1667	find-kth-bit-in-nth-binary-string	Python3		Medium
1668	find-longest-awesome-substring			Hard
1669	minimum-cost-to-cut-a-stick			Hard
1672	find-the-index-of-the-large-integer	🔒		Medium
1674	minimum-operations-to-make-array-equal		📝	Medium
1675	magnetic-force-between-two-balls			Medium
1676	minimum-number-of-days-to-eat-n-oranges			Hard
1677	matrix-diagonal-sum			Easy
1678	number-of-ways-to-split-a-string			Medium
1679	shortest-subarray-to-be-removed-to-make-array-sorted			Medium
1680	count-all-possible-routes			Hard
1681	guess-the-majority-in-a-hidden-array	🔒		Medium
1682	most-visited-sector-in-a-circular-track			Easy
1683	maximum-number-of-coins-you-can-get			Medium
1684	find-latest-group-of-size-m			Medium
1685	stone-game-v			Hard
1687	the-most-similar-path-in-a-graph	🔒		Hard
1689	detect-pattern-of-length-m-repeated-k-or-more-times	Python3		Easy
1690	maximum-length-of-subarray-with-positive-product			Medium
1691	minimum-number-of-days-to-disconnect-island			Hard
1692	number-of-ways-to-reorder-array-to-get-same-bst			Hard
1693	sum-of-all-odd-length-subarrays			Easy
1694	make-sum-divisible-by-p			Medium
1695	maximum-sum-obtained-of-any-permutation			Medium
1696	strange-printer-ii			Hard
1697	strings-differ-by-one-character	🔒		Medium
1698	replace-all-s-to-avoid-consecutive-repeating-characters			Easy
1699	number-of-ways-where-square-of-number-is-equal-to-product-of-two-numbers			Medium
1700	minimum-time-to-make-rope-colorful			Medium
1701	remove-max-number-of-edges-to-keep-graph-fully-traversable			Hard
1703	put-boxes-into-the-warehouse-i	🔒	📝	Medium
1704	special-positions-in-a-binary-matrix			Easy
1705	count-unhappy-friends			Medium
1706	min-cost-to-connect-all-points		📝	Medium
1707	check-if-string-is-transformable-with-substring-sort-operations			Hard
1708	design-parking-system			Easy
1709	alert-using-same-key-card-three-or-more-times-in-a-one-hour-period			Medium
1710	find-servers-that-handled-most-number-of-requests			Hard
1711	find-valid-matrix-given-row-and-column-sums			Medium
1713	dot-product-of-two-sparse-vectors	🔒	📝	Medium
1714	rearrange-spaces-between-words			Easy
1715	split-a-string-into-the-max-number-of-unique-substrings			Medium
1716	maximum-non-negative-product-in-a-matrix			Medium
1717	minimum-cost-to-connect-two-groups-of-points			Hard
1719	put-boxes-into-the-warehouse-ii	🔒		Medium
1720	crawler-log-folder			Easy
1721	maximum-profit-of-operating-a-centennial-wheel			Medium
1722	throne-inheritance			Medium
1723	maximum-number-of-achievable-transfer-requests			Hard
1725	number-of-sets-of-k-non-overlapping-line-segments			Medium
1726	coordinate-with-maximum-network-quality			Medium
1727	cat-and-mouse-ii			Hard
1728	fancy-sequence			Hard
1729	binary-search-tree-iterator-ii	🔒	📝	Medium
1730	special-array-with-x-elements-greater-than-or-equal-x			Easy
1731	even-odd-tree			Medium
1732	minimum-one-bit-operations-to-make-integers-zero			Hard
1733	maximum-number-of-visible-points			Hard
1736	build-binary-expression-tree-from-infix-expression	🔒		Hard
1737	maximum-nesting-depth-of-the-parentheses	Python3		Easy
1738	maximal-network-rank			Medium
1739	split-two-strings-to-make-palindrome	Python3		Medium
1740	count-subtrees-with-max-distance-between-cities			Hard
1741	sort-array-by-increasing-frequency			Easy
1742	widest-vertical-area-between-two-points-containing-no-points			Medium
1743	count-substrings-that-differ-by-one-character			Medium
1744	number-of-ways-to-form-a-target-string-given-a-dictionary			Hard
1745	find-nearest-right-node-in-binary-tree	🔒	📝	Medium
1746	largest-substring-between-two-equal-characters			Easy
1747	lexicographically-smallest-string-after-applying-operations			Medium
1748	best-team-with-no-conflicts			Medium
1750	check-if-two-expression-trees-are-equivalent	🔒		Medium
1751	slowest-key	Python3	📝	Easy
1752	arithmetic-subarrays	Python3		Medium
1753	path-with-minimum-effort		📝	Medium
1755	defuse-the-bomb			Easy
1756	minimum-deletions-to-make-string-balanced			Medium
1757	minimum-jumps-to-reach-home			Medium
1758	distribute-repeating-integers			Hard
1760	check-array-formation-through-concatenation	Python3	📝	Easy
1761	count-sorted-vowel-strings	Python3	📝	Medium
1762	furthest-building-you-can-reach	Python3	📝	Medium
1764	maximum-repeating-substring			Easy
1765	merge-in-between-linked-lists			Medium
1766	minimum-number-of-removals-to-make-mountain-array			Hard
1767	design-front-middle-back-queue			Medium
1768	design-an-expression-tree-with-evaluate-function	🔒		Medium
1769	get-maximum-in-generated-array		📝	Easy
1770	minimum-deletions-to-make-character-frequencies-unique	Python3	📝	Medium
1771	sell-diminishing-valued-colored-balls			Medium
1772	create-sorted-array-through-instructions		📝	Hard
1774	add-two-polynomials-represented-as-linked-lists	🔒		Medium
1775	design-an-ordered-stream	Python3		Easy
1776	minimum-operations-to-reduce-x-to-zero	Python3	📝	Medium
1777	determine-if-two-strings-are-close	Python3	📝	Medium
1778	maximize-grid-happiness			Hard
1780	lowest-common-ancestor-of-a-binary-tree-ii	🔒		Medium
1781	check-if-two-string-arrays-are-equivalent		📝	Easy
1782	smallest-string-with-a-given-numeric-value		📝	Medium
1783	ways-to-make-a-fair-array			Medium
1784	minimum-initial-energy-to-finish-tasks			Hard
1786	count-the-number-of-consistent-strings			Easy
1787	sum-of-absolute-differences-in-a-sorted-array			Medium
1788	stone-game-vi			Medium
1789	delivering-boxes-from-storage-to-ports			Hard
1790	lowest-common-ancestor-of-a-binary-tree-iii	🔒		Medium
1791	richest-customer-wealth		📝	Easy
1792	find-the-most-competitive-subsequence		📝	Medium
1793	minimum-moves-to-make-array-complementary			Medium
1794	minimize-deviation-in-array		📝	Hard
1796	correct-a-binary-tree	🔒		Medium
1797	goal-parser-interpretation			Easy
1798	max-number-of-k-sum-pairs		📝	Medium
1799	minimum-incompatibility			Hard
1800	concatenation-of-consecutive-binary-numbers		📝	Medium
1802	number-of-students-unable-to-eat-lunch			Easy
1803	average-waiting-time			Medium
1804	maximum-binary-string-after-change			Medium
1805	minimum-adjacent-swaps-for-k-consecutive-ones			Hard
1806	count-of-matches-in-tournament			Easy
1807	partitioning-into-minimum-number-of-deci-binary-numbers	Python3	📝	Medium
1808	stone-game-vii		📝	Medium
1809	sum-of-special-evenly-spaced-elements-in-array	🔒		Hard
1810	change-the-root-of-a-binary-tree	🔒		Medium
1812	reformat-phone-number			Easy
1813	maximum-erasure-value		📝	Medium
1814	jump-game-vi	Python3	📝	Medium
1815	checking-existence-of-edge-length-limited-paths			Hard
1816	lowest-common-ancestor-of-a-binary-tree-iv	🔒		Medium
1817	calculate-money-in-leetcode-bank	Python3		Easy
1818	maximum-score-from-removing-substrings	Python3		Medium
1819	construct-the-lexicographically-largest-valid-sequence			Medium
1820	number-of-ways-to-reconstruct-a-tree			Hard
1822	longest-palindromic-subsequence-ii	🔒		Medium
1823	determine-if-string-halves-are-alike		📝	Easy
1824	maximum-number-of-eaten-apples		📝	Medium
1825	find-minimum-time-to-finish-all-jobs			Hard
1826	maximum-xor-with-an-element-from-array			Hard
1828	count-ways-to-distribute-candies	🔒		Hard
1829	maximum-units-on-a-truck	Python3	📝	Easy
1830	count-good-meals			Medium
1831	ways-to-split-array-into-three-subarrays		📝	Medium
1832	minimum-operations-to-make-a-subsequence			Hard
1833	find-the-highest-altitude			Easy
1834	minimum-number-of-people-to-teach			Medium
1835	decode-xored-permutation			Medium
1836	count-ways-to-make-array-with-product			Hard
1838	number-of-distinct-substrings-in-a-string	🔒		Medium
1839	decode-xored-array			Easy
1840	minimize-hamming-distance-after-swap-operations			Medium
1843	number-of-rectangles-that-can-form-the-largest-square			Easy
1844	maximum-number-of-balls-in-a-box			Easy
1845	largest-submatrix-with-rearrangements			Medium
1847	largest-subarray-length-k	🔒		Easy
1848	sum-of-unique-elements			Easy
1849	maximum-absolute-sum-of-any-subarray			Medium
1850	minimum-length-of-string-after-deleting-similar-ends			Medium
1851	maximum-number-of-events-that-can-be-attended-ii			Hard
1858	latest-time-by-replacing-hidden-digits			Easy
1859	change-minimum-characters-to-satisfy-one-of-three-conditions			Medium
1860	find-kth-largest-xor-coordinate-value			Medium
1861	building-boxes			Hard
1865	checking-existence-of-edge-length-limited-paths-ii	🔒		Hard
1866	restore-the-array-from-adjacent-pairs			Medium
1871	palindrome-partitioning-iv			Hard
1872	can-you-eat-your-favorite-candy-on-your-favorite-day			Medium
1873	longest-nice-substring			Easy
1874	form-array-by-concatenating-subarrays-of-another-array			Medium
1875	tree-of-coprimes			Hard
1876	map-of-highest-peak			Medium
1878	check-if-array-is-sorted-and-rotated			Easy
1879	maximum-score-from-removing-stones			Medium
1880	largest-merge-of-two-strings			Medium
1881	closest-subsequence-sum			Hard
1883	find-distance-in-a-binary-tree	🔒		Medium
1884	minimum-changes-to-make-alternating-binary-string			Easy
1885	count-number-of-homogenous-substrings			Medium
1886	minimum-limit-of-balls-in-a-bag			Medium
1887	minimum-degree-of-a-connected-trio-in-a-graph			Hard
1888	find-nearest-point-that-has-the-same-x-or-y-coordinate			Easy
1889	check-if-number-is-a-sum-of-powers-of-three			Medium
1890	sum-of-beauty-of-all-substrings			Medium
1891	count-pairs-of-nodes			Hard
1893	maximum-subarray-sum-after-one-operation	🔒		Medium
1894	merge-strings-alternately			Easy
1895	minimum-number-of-operations-to-move-all-balls-to-each-box			Medium
1896	maximum-score-from-performing-multiplication-operations		📝	Medium
1897	maximize-palindrome-length-from-subsequences			Hard
1899	count-items-matching-a-rule	Python3		Easy
1900	closest-dessert-cost			Medium
1901	equal-sum-arrays-with-minimum-number-of-operations			Medium
1902	car-fleet-ii			Hard
1903	design-most-recently-used-queue	🔒		Medium
1904	second-largest-digit-in-a-string			Easy
1905	design-authentication-manager			Medium
1906	maximize-score-after-n-operations			Hard
1907	count-pairs-with-xor-in-a-range			Hard
1909	buildings-with-an-ocean-view	🔒	📝	Medium
1910	check-if-binary-string-has-at-most-one-segment-of-ones	Python3		Easy
1911	minimum-elements-to-add-to-form-a-given-sum			Medium
1912	number-of-restricted-paths-from-first-to-last-node			Medium
1913	make-the-xor-of-all-segments-equal-to-zero			Hard
1915	check-if-one-string-swap-can-make-strings-equal			Easy
1916	find-center-of-star-graph			Easy
1917	maximum-average-pass-ratio			Medium
1918	maximum-score-of-a-good-subarray			Hard
1919	sort-features-by-popularity	🔒		Medium
1920	determine-color-of-a-chessboard-square			Easy
1923	sentence-similarity-iii			Medium
1924	maximum-number-of-groups-getting-fresh-donuts			Hard
1925	count-nice-pairs-in-an-array			Medium
1927	maximum-ascending-subarray-sum			Easy
1928	number-of-orders-in-the-backlog			Medium
1929	maximum-value-at-a-given-index-in-a-bounded-array			Medium
1930	maximum-number-of-consecutive-values-you-can-make			Medium
1931	shortest-path-in-a-hidden-grid	🔒		Medium
1933	number-of-different-integers-in-a-string			Easy
1934	evaluate-the-bracket-pairs-of-a-string			Medium
1935	minimum-number-of-operations-to-reinitialize-a-permutation			Medium
1936	maximize-number-of-nice-divisors			Hard
1937	maximize-the-beauty-of-the-garden	🔒		Hard
1938	minimum-operations-to-make-the-array-increasing			Easy
1939	queries-on-number-of-points-inside-a-circle	Python3		Medium
1940	maximum-xor-for-each-query			Medium
1941	minimum-number-of-operations-to-make-string-sorted			Hard
1943	count-pairs-of-equal-substrings-with-minimum-difference	🔒		Medium
1944	truncate-sentence			Easy
1945	finding-the-users-active-minutes			Medium
1946	minimum-absolute-sum-difference			Medium
1947	number-of-different-subsequences-gcds			Hard
1949	implement-trie-ii-prefix-tree	🔒		Medium
1950	sign-of-the-product-of-an-array			Easy
1951	find-the-winner-of-the-circular-game			Medium
1952	minimum-sideway-jumps			Medium
1953	finding-mk-average			Hard
1954	replace-all-digits-with-characters			Easy
1955	seat-reservation-manager			Medium
1956	maximum-element-after-decreasing-and-rearranging			Medium
1957	closest-room			Hard
1959	minimum-path-cost-in-a-hidden-grid	🔒		Medium
1960	check-if-the-sentence-is-pangram			Easy
1961	maximum-ice-cream-bars			Medium
1962	single-threaded-cpu		📝	Medium
1963	find-xor-sum-of-all-pairs-bitwise-and			Hard
1965	sum-of-digits-in-base-k			Easy
1966	frequency-of-the-most-frequent-element			Medium
1967	longest-substring-of-all-vowels-in-order			Medium
1968	maximum-building-height			Hard
1969	maximum-number-of-accepted-invitations	🔒		Medium
1970	sorting-the-sentence			Easy
1971	incremental-memory-leak			Medium
1972	rotating-the-box			Medium
1975	minimum-distance-to-the-target-element			Easy
1976	splitting-a-string-into-descending-consecutive-values			Medium
1977	minimum-interval-to-include-each-query			Hard
1978	minimum-adjacent-swaps-to-reach-the-kth-smallest-number			Medium
1979	maximum-number-of-people-that-can-be-caught-in-tag	🔒		Medium
1980	faulty-sensor	🔒		Easy
1982	remove-duplicates-from-an-unsorted-linked-list	🔒		Medium
1983	maximum-population-year			Easy
1984	maximum-distance-between-a-pair-of-values			Medium
1985	maximum-subarray-min-product			Medium
1986	largest-color-value-in-a-directed-graph			Hard
1987	substrings-of-size-three-with-distinct-characters			Easy
1988	minimize-maximum-pair-sum-in-array			Medium
1989	minimum-xor-sum-of-two-arrays			Hard
1990	get-biggest-three-rhombus-sums-in-a-grid			Medium
1992	sort-linked-list-already-sorted-using-absolute-values	🔒		Medium
1993	sum-of-all-subset-xor-totals			Easy
1994	minimum-number-of-swaps-to-make-the-binary-string-alternating			Medium
1995	finding-pairs-with-a-certain-sum			Medium
1996	number-of-ways-to-rearrange-sticks-with-k-sticks-visible			Hard
1997	next-palindrome-using-same-digits	🔒		Hard
1999	longer-contiguous-segments-of-ones-than-zeros			Easy
2000	minimum-speed-to-arrive-on-time			Medium
2001	jump-game-vii			Medium
2002	stone-game-viii			Hard
2003	distinct-numbers-in-each-subarray	🔒		Medium
2005	check-if-all-the-integers-in-a-range-are-covered			Easy
2006	find-the-student-that-will-replace-the-chalk			Medium
2007	maximum-cost-of-trip-with-k-highways	🔒		Hard
2008	minimum-cost-to-change-the-final-value-of-expression			Hard
2009	longest-word-with-all-prefixes	🔒		Medium
2010	check-if-word-equals-summation-of-two-words			Easy
2011	maximum-value-after-insertion			Medium
2012	process-tasks-using-servers			Medium
2013	minimum-skips-to-arrive-at-meeting-on-time			Hard
2015	determine-whether-matrix-can-be-obtained-by-rotation			Easy
2016	reduction-operations-to-make-the-array-elements-equal			Medium
2017	minimum-number-of-flips-to-make-the-binary-string-alternating			Medium
2018	minimum-space-wasted-from-packaging			Hard
2019	product-of-two-run-length-encoded-arrays	🔒		Medium
2020	remove-one-element-to-make-the-array-strictly-increasing			Easy
2021	remove-all-occurrences-of-a-substring			Medium
2022	maximum-alternating-subsequence-sum			Medium
2023	design-movie-rental-system			Hard
2025	redistribute-characters-to-make-all-strings-equal			Easy
2026	merge-triplets-to-form-target-triplet			Medium
2027	maximum-number-of-removable-characters			Medium
2028	the-earliest-and-latest-rounds-where-players-compete			Hard
2029	minimize-product-sum-of-two-arrays	🔒	📝	Medium
2031	egg-drop-with-2-eggs-and-n-floors			Medium
2032	largest-odd-number-in-string			Easy
2033	the-number-of-full-rounds-you-have-played			Medium
2034	minimum-absolute-difference-queries			Medium
2035	count-sub-islands			Medium
2036	count-pairs-in-two-arrays	🔒		Medium
2037	count-square-sum-triples			Easy
2038	nearest-exit-from-entrance-in-maze			Medium
2039	sum-game			Medium
2040	minimum-cost-to-reach-destination-in-time			Hard
2042	maximum-product-difference-between-two-pairs			Easy
2043	cyclically-rotating-a-grid			Medium
2044	number-of-wonderful-substrings			Medium
2045	cutting-ribbons	🔒		Medium
2047	find-a-peak-element-ii			Medium
2048	build-array-from-permutation			Easy
2049	eliminate-maximum-number-of-monsters			Medium
2050	count-good-numbers			Medium
2051	longest-common-subpath			Hard
2052	depth-of-bst-given-insertion-order	🔒		Medium
2053	check-if-all-characters-have-equal-number-of-occurrences			Easy
2054	the-number-of-the-smallest-unoccupied-chair			Medium
2055	describe-the-painting			Medium
2056	jump-game-viii	🔒		Medium
2058	concatenation-of-array			Easy
2059	unique-length-3-palindromic-subsequences			Medium
2060	merge-bsts-to-create-single-bst			Hard
2061	painting-a-grid-with-three-different-colors			Hard
2062	game-of-nim	🔒		Medium
2065	check-for-contradictions-in-equations	🔒		Hard
2066	add-minimum-number-of-rungs	Python3		Medium
2067	maximum-number-of-points-with-cost			Medium
2068	maximum-genetic-difference-query			Hard
2069	kth-smallest-subarray-sum	🔒		Medium
2070	check-if-string-is-decomposable-into-value-equal-substrings	🔒		Easy
2071	longest-common-subsequence-between-sorted-arrays	🔒		Medium
2072	maximum-of-minimum-values-in-all-subarrays	🔒		Medium
2073	minimum-time-for-k-virus-variants-to-spread	🔒		Hard
2074	erect-the-fence-ii	🔒		Hard
2075	brightest-position-on-street	🔒		Medium
2076	sum-of-digits-of-string-after-convert	Python3		Easy
2077	largest-number-after-mutating-substring			Medium
2078	maximum-compatibility-score-sum			Medium
2079	delete-duplicate-folders-in-system			Hard
2080	check-if-move-is-legal			Medium
2081	minimum-total-space-wasted-with-k-resizing-operations			Medium
2082	minimum-cost-to-separate-sentence-into-rows	🔒		Medium
2083	three-divisors	Python3		Easy
2084	maximum-number-of-weeks-for-which-you-can-work			Medium
2085	array-with-elements-not-equal-to-average-of-neighbors	Python3		Medium
2086	count-number-of-special-subsequences			Hard
2088	minimum-time-to-type-word-using-special-typewriter			Easy
2089	maximum-matrix-sum			Medium
2090	number-of-ways-to-arrive-at-destination			Medium
2091	number-of-ways-to-separate-numbers			Hard
2093	check-if-string-is-a-prefix-of-array	Python3		Easy
2094	remove-stones-to-minimize-the-total			Medium
2095	minimum-number-of-swaps-to-make-the-string-balanced			Medium
2096	find-the-longest-valid-obstacle-course-at-each-position			Hard
2099	number-of-strings-that-appear-as-substrings-in-word	Python3		Easy
2100	minimum-non-zero-product-of-the-array-elements			Medium
2101	last-day-where-you-can-still-cross			Hard
2102	find-the-middle-index-in-array			Easy
2103	find-all-groups-of-farmland			Medium
2104	operations-on-tree			Medium
2105	the-number-of-good-subsets			Hard
2106	find-greatest-common-divisor-of-array	Python3		Easy
2107	find-unique-binary-string	Python3		Medium
2108	minimize-the-difference-between-target-and-chosen-elements	Python3		Medium
2109	find-array-given-subset-sums			Hard
2111	binary-searchable-numbers-in-an-unsorted-array	🔒		Medium
2112	minimum-difference-between-highest-and-lowest-of-k-scores			Easy
2113	find-the-kth-largest-integer-in-the-array			Medium
2114	minimum-number-of-work-sessions-to-finish-the-tasks			Medium
2115	number-of-unique-good-subsequences			Hard
2116	count-number-of-pairs-with-absolute-difference-k			Easy
2117	find-original-array-from-doubled-array		📝	Medium
2118	maximum-earnings-from-taxi			Medium
2119	minimum-number-of-operations-to-make-array-continuous			Hard
2121	find-if-path-exists-in-graph			Easy
2122	count-special-quadruplets	Python3		Easy
2123	the-number-of-weak-characters-in-the-game	Python3	📝	Medium
2124	first-day-where-you-have-been-in-all-the-rooms			Medium
2125	gcd-sort-of-an-array			Hard
2126	count-nodes-equal-to-sum-of-descendants	🔒		Medium
2128	reverse-prefix-of-word	Python3		Easy
2129	number-of-pairs-of-interchangeable-rectangles	Python3		Medium
2130	maximum-product-of-the-length-of-two-palindromic-subsequences			Medium
2131	smallest-missing-genetic-value-in-each-subtree			Hard
2132	convert-1d-array-into-2d-array			Easy
2133	number-of-pairs-of-strings-with-concatenation-equal-to-target			Medium
2134	maximize-the-confusion-of-an-exam			Medium
2135	maximum-number-of-ways-to-partition-an-array			Hard
2137	final-value-of-variable-after-performing-operations	Python3		Easy
2138	sum-of-beauty-in-the-array			Medium
2139	detect-squares			Medium
2140	longest-subsequence-repeated-k-times			Hard
2141	smallest-greater-multiple-made-of-two-digits	🔒		Medium
2142	average-height-of-buildings-in-each-segment	🔒		Medium
2144	maximum-difference-between-increasing-elements			Easy
2145	grid-game			Medium
2146	check-if-word-can-be-placed-in-crossword			Medium
2147	the-score-of-students-solving-math-expression			Hard
2148	minimum-number-of-moves-to-seat-everyone			Easy
2149	remove-colored-pieces-if-both-neighbors-are-the-same-color			Medium
2150	kth-smallest-product-of-two-sorted-arrays			Hard
2151	the-time-when-the-network-becomes-idle			Medium
2153	subtree-removal-game-with-fibonacci-tree	🔒		Hard
2154	minimum-moves-to-convert-string	Python3		Easy
2155	find-missing-observations			Medium
2156	stone-game-ix	Python3		Medium
2157	smallest-k-length-subsequence-with-occurrences-of-a-letter			Hard
2159	two-out-of-three			Easy
2160	minimum-operations-to-make-a-uni-value-grid			Medium
2161	stock-price-fluctuation		📝	Medium
2162	partition-array-into-two-arrays-to-minimize-sum-difference			Hard
2163	kth-distinct-string-in-an-array			Easy
2164	two-best-non-overlapping-events			Medium
2165	plates-between-candles			Medium
2166	number-of-valid-move-combinations-on-chessboard			Hard
2168	check-if-numbers-are-ascending-in-a-sentence	Python3		Easy
2169	simple-bank-system	Python3		Medium
2170	count-number-of-maximum-bitwise-or-subsets	Python3		Medium
2171	second-minimum-time-to-reach-destination			Hard
2173	number-of-valid-words-in-a-sentence			Easy
2174	next-greater-numerically-balanced-number			Medium
2175	count-nodes-with-the-highest-score			Medium
2176	parallel-courses-iii			Hard
2177	check-whether-two-strings-are-almost-equivalent			Easy
2178	walking-robot-simulation-ii			Medium
2179	most-beautiful-item-for-each-query			Medium
2180	maximum-number-of-tasks-you-can-assign			Hard
2181	smallest-index-with-equal-value	Python3		Easy
2182	find-the-minimum-and-maximum-number-of-nodes-between-critical-points			Medium
2183	minimum-operations-to-convert-number			Medium
2184	check-if-an-original-string-exists-given-two-encoded-strings			Hard
2186	count-vowel-substrings-of-a-string	Python3		Easy
2187	vowels-of-all-substrings	Python3		Medium
2188	minimized-maximum-of-products-distributed-to-any-store			Medium
2189	maximum-path-quality-of-a-graph			Hard
2190	count-common-words-with-one-occurrence			Easy
2191	minimum-number-of-buckets-required-to-collect-rainwater-from-houses			Medium
2192	minimum-cost-homecoming-of-a-robot-in-a-grid			Medium
2193	count-fertile-pyramids-in-a-land			Hard
2195	time-needed-to-buy-tickets			Easy
2196	reverse-nodes-in-even-length-groups			Medium
2197	decode-the-slanted-ciphertext			Medium
2198	process-restricted-friend-requests			Hard
2199	two-furthest-houses-with-different-colors	Python3		Easy
2200	stamping-the-grid			Hard
2201	valid-arrangement-of-pairs			Hard
2202	sum-of-k-mirror-numbers			Hard
2203	number-of-spaces-cleaning-robot-cleaned	🔒		Medium
2204	find-subsequence-of-length-k-with-the-largest-sum			Easy
2205	find-good-days-to-rob-the-bank	Python3		Medium
2206	detonate-the-maximum-bombs			Medium
2207	sequentially-ordinal-rank-tracker			Hard
2209	number-of-equal-count-substrings	🔒		Medium
2210	find-target-indices-after-sorting-array			Easy
2211	k-radius-subarray-averages			Medium
2212	removing-minimum-and-maximum-from-array			Medium
2213	find-all-people-with-secret			Hard
2215	finding-3-digit-even-numbers	Python3		Easy
2216	delete-the-middle-node-of-a-linked-list	Python3		Medium
2217	step-by-step-directions-from-a-binary-tree-node-to-another	Python3		Medium
2218	paths-in-maze-that-lead-to-same-room	🔒		Medium
2219	maximum-number-of-words-found-in-sentences			Easy
2220	find-all-possible-recipes-from-given-supplies			Medium
2221	check-if-a-parentheses-string-can-be-valid			Medium
2222	abbreviating-the-product-of-a-range			Hard
2225	substrings-that-begin-and-end-with-the-same-letter	🔒		Medium
2226	rings-and-rods			Easy
2227	sum-of-subarray-ranges			Medium
2228	watering-plants-ii			Medium
2229	maximum-fruits-harvested-after-at-most-k-steps			Hard
2230	minimum-cost-to-reach-city-with-discounts	🔒		Medium
2231	find-first-palindromic-string-in-the-array			Easy
2232	adding-spaces-to-a-string			Medium
2233	number-of-smooth-descent-periods-of-a-stock			Medium
2234	minimum-operations-to-make-the-array-k-increasing			Hard
2235	capitalize-the-title			Easy
2236	maximum-twin-sum-of-a-linked-list			Medium
2237	longest-palindrome-by-concatenating-two-letter-words			Medium
2238	a-number-after-a-double-reversal			Easy
2239	execution-of-all-suffix-instructions-staying-in-a-grid			Medium
2240	intervals-between-identical-elements			Medium
2241	recover-the-original-array			Hard
2242	subsequence-of-size-k-with-the-largest-even-sum	🔒		Medium
2243	check-if-all-as-appears-before-all-bs	Python3		Easy
2244	number-of-laser-beams-in-a-bank	Python3		Medium
2245	destroying-asteroids	Python3		Medium
2246	maximum-employees-to-be-invited-to-a-meeting			Hard
2247	number-of-unique-flavors-after-sharing-k-candies	🔒		Medium
2248	minimum-cost-of-buying-candies-with-discount			Easy
2249	count-the-hidden-sequences			Medium
2250	k-highest-ranked-items-within-a-price-range			Medium
2251	number-of-ways-to-divide-a-long-corridor			Hard
2254	check-if-every-row-and-column-contains-all-numbers			Easy
2255	minimum-swaps-to-group-all-1s-together-ii			Medium
2256	count-words-obtained-after-adding-a-letter			Medium
2257	earliest-possible-day-of-full-bloom			Hard
2258	elements-in-array-after-removing-and-replacing-elements	🔒		Medium
2259	minimum-operations-to-remove-adjacent-ones-in-matrix	🔒		Hard
2260	divide-a-string-into-groups-of-size-k			Easy
2261	all-divisions-with-the-highest-score-of-a-binary-array			Medium
2262	solving-questions-with-brainpower			Medium
2263	maximum-running-time-of-n-computers			Hard
2264	minimum-sum-of-four-digit-number-after-splitting-digits			Easy
2265	partition-array-according-to-given-pivot			Medium
2266	minimum-cost-to-set-cooking-time			Medium
2267	minimum-difference-in-sums-after-removal-of-elements			Hard
2268	remove-all-ones-with-row-and-column-flips	🔒		Medium
2269	count-elements-with-strictly-smaller-and-greater-elements			Easy
2270	find-all-lonely-numbers-in-the-array			Medium
2271	rearrange-array-elements-by-sign			Medium
2272	maximum-good-people-based-on-statements			Hard
2273	pour-water-between-buckets-to-make-water-levels-equal	🔒		Medium
2274	keep-multiplying-found-values-by-two			Easy
2275	find-substring-with-given-hash-value			Hard
2276	groups-of-strings			Hard
2277	count-equal-and-divisible-pairs-in-an-array			Easy
2278	find-three-consecutive-integers-that-sum-to-a-given-number			Medium
2279	maximum-split-of-positive-even-integers			Medium
2280	count-good-triplets-in-an-array			Hard
2282	choose-numbers-from-two-arrays-in-range	🔒		Hard
2283	sort-even-and-odd-indices-independently			Easy
2284	smallest-value-of-the-rearranged-number			Medium
2285	design-bitset			Medium
2286	minimum-time-to-remove-all-cars-containing-illegal-goods			Hard
2287	minimum-number-of-lines-to-cover-points	🔒		Medium
2288	count-operations-to-obtain-zero			Easy
2289	minimum-operations-to-make-the-array-alternating			Medium
2290	removing-minimum-number-of-magic-beans			Medium
2291	maximum-and-sum-of-array			Hard
2292	counting-words-with-a-given-prefix			Easy
2293	minimum-number-of-steps-to-make-two-strings-anagram-ii			Medium
2294	minimum-time-to-complete-trips			Medium
2295	minimum-time-to-finish-the-race			Hard
2297	amount-of-new-area-painted-each-day	🔒		Hard
2298	count-integers-with-even-digit-sum			Easy
2299	merge-nodes-in-between-zeros			Medium
2300	construct-string-with-repeat-limit			Medium
2301	count-array-pairs-divisible-by-k			Hard
2303	unique-substrings-with-equal-digit-frequency	🔒		Medium
2304	cells-in-a-range-on-an-excel-sheet			Easy
2305	append-k-integers-with-minimal-sum			Medium
2306	create-binary-tree-from-descriptions			Medium
2307	replace-non-coprime-numbers-in-array			Hard
2308	divide-array-into-equal-pairs			Easy
2309	maximize-number-of-subsequences-in-a-string			Medium
2310	minimum-operations-to-halve-array-sum			Medium
2311	minimum-white-tiles-after-covering-with-carpets			Hard
2312	most-frequent-number-following-key-in-an-array			Easy
2314	remove-all-ones-with-row-and-column-flips-ii	🔒		Medium
2316	count-hills-and-valleys-in-an-array			Easy
2317	count-collisions-on-a-road			Medium
2318	maximum-points-in-an-archery-competition			Medium
2319	longest-substring-of-one-repeating-character			Hard
2320	find-all-k-distant-indices-in-an-array			Easy
2321	minimum-weighted-subgraph-with-the-required-paths			Hard
2322	number-of-ways-to-build-sturdy-brick-wall	🔒		Medium
2323	minimum-bit-flips-to-convert-number			Easy
2324	find-triangular-sum-of-an-array			Medium
2325	number-of-ways-to-select-buildings			Medium
2326	sum-of-scores-of-built-strings			Hard
2327	largest-number-after-digit-swaps-by-parity			Easy
2328	minimize-result-by-adding-parentheses-to-expression			Medium
2329	maximum-product-after-k-increments			Medium
2330	maximum-total-beauty-of-the-gardens			Hard
2331	intersection-of-multiple-arrays			Easy
2332	count-lattice-points-inside-a-circle			Medium
2333	count-number-of-rectangles-containing-each-point			Medium
2334	number-of-flowers-in-full-bloom			Hard
2337	remove-digit-from-number-to-maximize-result			Easy
2338	minimum-consecutive-cards-to-pick-up			Medium
2339	k-divisible-elements-subarrays			Medium
2340	total-appeal-of-a-string			Hard
2341	count-prefixes-of-a-given-string			Easy
2342	minimum-average-difference			Medium
2343	count-unguarded-cells-in-the-grid			Medium
2344	escape-the-spreading-fire			Hard
2345	minimum-number-of-operations-to-convert-time			Easy
2346	largest-3-same-digit-number-in-string			Easy
2347	count-nodes-equal-to-average-of-subtree			Medium
2348	count-number-of-texts			Medium
2349	check-if-there-is-a-valid-parentheses-string-path			Hard
2350	find-closest-number-to-zero			Easy
2351	number-of-ways-to-buy-pens-and-pencils			Medium
2352	design-an-atm-machine			Medium
2353	maximum-score-of-a-node-sequence			Hard
2354	minimum-health-to-beat-game	🔒		Medium
2355	maximum-consecutive-floors-without-special-floors			Medium
2356	largest-combination-with-bitwise-and-greater-than-zero			Medium
2357	count-integers-in-intervals			Hard
2358	number-of-ways-to-split-array			Medium
2359	maximum-white-tiles-covered-by-a-carpet			Medium
2360	substring-with-largest-variance			Hard
2361	calculate-digit-sum-of-a-string			Easy
2362	minimum-rounds-to-complete-all-tasks			Medium
2363	maximum-trailing-zeros-in-a-cornered-path			Medium
2364	longest-path-with-different-adjacent-characters			Hard
2365	percentage-of-letter-in-string	Python3		Easy
2366	maximum-bags-with-full-capacity-of-rocks	Python3		Medium
2367	minimum-lines-to-represent-a-line-chart			Medium
2368	sum-of-total-strength-of-wizards			Hard
2369	maximum-sum-score-of-array	🔒		Medium
2372	rearrange-characters-to-make-target-string			Easy
2373	apply-discount-to-prices			Medium
2374	steps-to-make-array-non-decreasing			Medium
2375	minimum-obstacle-removal-to-reach-corner			Hard
2377	check-if-number-has-equal-digit-count-and-digit-value			Easy
2378	sender-with-largest-word-count			Medium
2379	maximum-total-importance-of-roads			Medium
2380	booking-concert-tickets-in-groups			Hard
2383	add-two-integers			Easy
2384	root-equals-sum-of-children			Easy
2385	count-positions-on-street-with-required-brightness	🔒		Medium
2386	min-max-game	Python3		Easy
2387	partition-array-such-that-maximum-difference-is-k			Medium
2388	replace-elements-in-an-array			Medium
2389	design-a-text-editor			Hard
2390	naming-a-company			Hard
2391	strong-password-checker-ii			Easy
2392	successful-pairs-of-spells-and-potions			Medium
2393	match-substring-after-replacement			Hard
2394	count-subarrays-with-score-less-than-k			Hard
2395	longest-binary-subsequence-less-than-or-equal-to-k			Medium
2396	design-video-sharing-platform	🔒		Hard
2397	count-number-of-ways-to-place-houses			Medium
2398	check-if-matrix-is-x-matrix			Easy
2399	minimum-flips-in-binary-tree-to-get-result	🔒		Hard
2400	minimum-score-after-removals-on-a-tree			Hard
2401	count-asterisks			Easy
2402	maximum-xor-after-operations			Medium
2403	count-unreachable-pairs-of-nodes-in-an-undirected-graph			Medium
2404	number-of-distinct-roll-sequences			Hard
2405	minimum-number-of-keypresses	🔒		Medium
2406	decode-the-message			Easy
2408	number-of-people-aware-of-a-secret			Medium
2409	number-of-increasing-paths-in-a-grid			Hard
2411	spiral-matrix-iv			Medium
2412	minimum-amount-of-time-to-fill-cups			Easy
2413	smallest-number-in-infinite-set			Medium
2414	move-pieces-to-obtain-a-string			Medium
2415	count-the-number-of-ideal-arrays			Hard
2416	evaluate-boolean-binary-tree			Easy
2417	the-latest-time-to-catch-a-bus			Medium
2418	minimum-sum-of-squared-difference			Medium
2419	subarray-with-elements-greater-than-varying-threshold			Hard
2420	closest-node-to-path-in-tree	🔒		Hard
2421	maximum-number-of-pairs-in-array			Easy
2422	query-kth-smallest-trimmed-number			Medium
2423	minimum-deletions-to-make-array-divisible			Hard
2425	number-of-people-that-can-be-seen-in-a-grid	🔒		Medium
2426	maximum-profit-from-trading-stocks	🔒		Medium
2427	first-letter-to-appear-twice			Easy
2428	equal-row-and-column-pairs			Medium
2429	design-a-food-rating-system			Medium
2430	number-of-excellent-pairs			Hard
2432	number-of-zero-filled-subarrays			Medium
2433	best-poker-hand			Easy
2434	design-a-number-container-system			Medium
2435	shortest-impossible-sequence-of-rolls			Hard
2436	make-array-zero-by-subtracting-equal-amounts			Easy
2437	maximum-number-of-groups-entering-a-competition			Medium
2438	find-closest-node-to-given-two-nodes			Medium
2439	longest-cycle-in-a-graph			Hard
2442	number-of-arithmetic-triplets			Easy
2443	check-if-there-is-a-valid-partition-for-the-array			Medium
2444	longest-ideal-subsequence			Medium
2445	reachable-nodes-with-restrictions			Medium
2447	merge-similar-items			Easy
2448	count-number-of-bad-pairs			Medium
2449	maximum-number-of-robots-within-budget			Hard
2450	minimum-replacements-to-sort-the-array			Hard
2454	largest-local-values-in-a-matrix	Python3		Easy
2455	node-with-highest-edge-score	Python3		Medium
2456	construct-smallest-number-from-di-string	Python3		Medium
2457	count-special-integers			Hard
2458	find-minimum-time-to-finish-all-jobs-ii	🔒		Medium
2459	minimum-hours-of-training-to-win-a-competition	Python3		Easy
2461	amount-of-time-for-binary-tree-to-be-infected	Python3		Medium
2462	find-the-k-sum-of-an-array			Hard
2463	minimum-recolors-to-get-k-consecutive-black-blocks			Easy
2464	time-needed-to-rearrange-a-binary-string			Medium
2465	shifting-letters-ii			Medium
2466	maximum-segment-sum-after-removals			Hard
2468	valid-palindrome-iv	🔒		Medium
2469	longest-subsequence-with-limited-sum	Python3		Easy
2470	removing-stars-from-a-string	Python3		Medium
2471	minimum-amount-of-time-to-collect-garbage	Python3		Medium
2472	build-a-matrix-with-conditions			Hard
2473	max-sum-of-a-pair-with-equal-sum-of-digits			Medium
2474	minimum-adjacent-swaps-to-make-a-valid-array	🔒		Medium
2475	largest-palindromic-number	Python3		Medium
2476	check-distances-between-same-letters	Python3		Easy
2477	number-of-ways-to-reach-a-position-after-exactly-k-steps	Python3		Medium
2478	longest-nice-subarray	Python3		Medium
2479	meeting-rooms-iii			Hard
2480	find-subarrays-with-equal-sum			Easy
2481	strictly-palindromic-number			Medium
2482	maximum-rows-covered-by-columns			Medium
2483	task-scheduler-ii			Medium
2485	finding-the-number-of-visible-mountains	🔒		Medium
2490	maximum-number-of-books-you-can-take	🔒		Hard
2500	minimum-costs-using-the-train-line	🔒		Hard
2506	minimize-maximum-value-in-a-grid	🔒		Hard
2517	choose-edges-to-maximize-score-in-a-tree	🔒		Medium
2522	median-of-a-row-wise-sorted-matrix	🔒		Medium
2535	count-strictly-increasing-subarrays	🔒		Medium