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My LeetCode Problems' Solutions.

Primary LanguageJavaScript

✏️ Leetcode Solutions with Cpp,Javascript,Python

Update time: 2018-09-12 22:01:06

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# Title Source Code Article Difficulty
1 two-sum Javascript 📝 Easy
2 add-two-numbers Javascript 📝 Medium
3 longest-substring-without-repeating-characters Javascript 📝 Medium
4 median-of-two-sorted-arrays Javascript 📝 Hard
5 longest-palindromic-substring Javascript 📝 Medium
6 zigzag-conversion Javascript 📝 Medium
7 reverse-integer Javascript 📝 Easy
8 string-to-integer-atoi Javascript Medium
9 palindrome-number Javascript 📝 Easy
10 regular-expression-matching Javascript 📝 Hard
11 container-with-most-water Javascript 📝 Medium
12 integer-to-roman Javascript Medium
13 roman-to-integer Javascript Easy
14 longest-common-prefix Javascript 📝 Easy
15 3sum Javascript Medium
16 3sum-closest Javascript Medium
17 letter-combinations-of-a-phone-number Javascript Medium
18 4sum Javascript Medium
19 remove-nth-node-from-end-of-list Javascript 📝 Medium
20 valid-parentheses Javascript Easy
21 merge-two-sorted-lists Javascript 📝 Easy
22 generate-parentheses Javascript 📝 Medium
23 merge-k-sorted-lists Javascript 📝 Hard
24 swap-nodes-in-pairs Javascript Medium
25 reverse-nodes-in-k-group Javascript Hard
26 remove-duplicates-from-sorted-array Javascript 📝 Easy
27 remove-element Javascript 📝 Easy
28 implement-strstr Javascript Cpp Easy
29 divide-two-integers Javascript Medium
30 substring-with-concatenation-of-all-words Javascript Hard
31 next-permutation Javascript 📝 Medium
32 longest-valid-parentheses Javascript 📝 Hard
33 search-in-rotated-sorted-array Javascript Medium
34 find-first-and-last-position-of-element-in-sorted-array Javascript 📝 Medium
35 search-insert-position Javascript Easy
36 valid-sudoku Javascript Medium
37 sudoku-solver Javascript Hard
38 count-and-say Javascript Easy
39 combination-sum Javascript Medium
40 combination-sum-ii Javascript Medium
41 first-missing-positive Javascript Hard
42 trapping-rain-water Javascript 📝 Hard
43 multiply-strings Javascript Medium
44 wildcard-matching Javascript Hard
45 jump-game-ii Javascript Hard
46 permutations Javascript Medium
47 permutations-ii Javascript Medium
48 rotate-image Python Javascript Medium
49 group-anagrams Javascript 📝 Medium
50 powx-n Javascript 📝 Medium
51 n-queens Javascript Hard
52 n-queens-ii Javascript Hard
53 maximum-subarray Javascript Easy
54 spiral-matrix Javascript 📝 Medium
55 jump-game Javascript 📝 Medium
56 merge-intervals Javascript 📝 Medium
57 insert-interval Javascript Hard
58 length-of-last-word Javascript Easy
59 spiral-matrix-ii Javascript Medium
60 permutation-sequence Javascript Medium
61 rotate-list Javascript Medium
62 unique-paths Javascript Medium
63 unique-paths-ii Javascript Medium
64 minimum-path-sum Javascript 📝 Medium
65 valid-number Javascript Hard
66 plus-one Javascript Easy
67 add-binary Javascript Easy
68 text-justification Javascript Hard
69 sqrtx Javascript Easy
70 climbing-stairs Javascript 📝 Easy
71 simplify-path Javascript Medium
72 edit-distance Javascript Hard
73 set-matrix-zeroes Javascript Medium
74 search-a-2d-matrix Javascript Medium
75 sort-colors Javascript Medium
76 minimum-window-substring Javascript 📝 Hard
77 combinations Javascript Medium
78 subsets Javascript Medium
79 word-search Javascript Medium
80 remove-duplicates-from-sorted-array-ii Javascript Medium
81 search-in-rotated-sorted-array-ii Javascript Medium
82 remove-duplicates-from-sorted-list-ii Javascript Medium
83 remove-duplicates-from-sorted-list Javascript 📝 Easy
84 largest-rectangle-in-histogram Javascript 📝 Hard
85 maximal-rectangle Javascript Hard
86 partition-list Javascript Medium
87 scramble-string Javascript Hard
88 merge-sorted-array Javascript Easy
89 gray-code Javascript Medium
90 subsets-ii Javascript Medium
91 decode-ways Javascript Medium
92 reverse-linked-list-ii Javascript Medium
93 restore-ip-addresses Javascript Medium
94 binary-tree-inorder-traversal Javascript 📝 Medium
95 unique-binary-search-trees-ii Javascript Medium
96 unique-binary-search-trees Javascript 📝 Medium
97 interleaving-string Javascript 📝 Hard
98 validate-binary-search-tree Javascript Medium
99 recover-binary-search-tree Javascript Hard
100 same-tree Javascript Easy
101 symmetric-tree Javascript 📝 Easy
102 binary-tree-level-order-traversal Javascript Medium
103 binary-tree-zigzag-level-order-traversal Javascript Medium
104 maximum-depth-of-binary-tree Javascript Easy
105 construct-binary-tree-from-preorder-and-inorder-traversal Javascript Medium
106 construct-binary-tree-from-inorder-and-postorder-traversal Javascript Medium
107 binary-tree-level-order-traversal-ii Javascript Easy
108 convert-sorted-array-to-binary-search-tree Javascript Easy
109 convert-sorted-list-to-binary-search-tree Javascript Medium
110 balanced-binary-tree Javascript Easy
111 minimum-depth-of-binary-tree Javascript Easy
112 path-sum Javascript Easy
113 path-sum-ii Javascript Medium
114 flatten-binary-tree-to-linked-list Javascript Medium
115 distinct-subsequences Cpp Hard
116 populating-next-right-pointers-in-each-node Cpp Medium
117 populating-next-right-pointers-in-each-node-ii Cpp Medium
118 pascals-triangle Cpp 📝 Easy
119 pascals-triangle-ii Cpp Easy
120 triangle Cpp Medium
121 best-time-to-buy-and-sell-stock Javascript Cpp 📝 Easy
122 best-time-to-buy-and-sell-stock-ii Cpp 📝 Easy
123 best-time-to-buy-and-sell-stock-iii Cpp Hard
124 binary-tree-maximum-path-sum Cpp Hard
125 valid-palindrome Cpp Easy
126 word-ladder-ii Cpp Hard
127 word-ladder Cpp Medium
128 longest-consecutive-sequence Cpp 📝 Hard
129 sum-root-to-leaf-numbers Cpp Medium
130 surrounded-regions Cpp Medium
131 palindrome-partitioning Cpp Medium
132 palindrome-partitioning-ii Cpp Hard
133 clone-graph Cpp Medium
134 gas-station Cpp Medium
135 candy Cpp 📝 Hard
136 single-number Cpp 📝 Easy
137 single-number-ii Cpp Medium
138 copy-list-with-random-pointer Cpp 📝 Medium
139 word-break Cpp 📝 Medium
140 word-break-ii Cpp 📝 Hard
141 linked-list-cycle Cpp 📝 Easy
142 linked-list-cycle-ii Cpp 📝 Medium
143 reorder-list Cpp Medium
144 binary-tree-preorder-traversal Cpp Medium
145 binary-tree-postorder-traversal Cpp Hard
146 lru-cache Cpp Hard
147 insertion-sort-list Cpp Medium
148 sort-list Cpp Medium
149 max-points-on-a-line Cpp Hard
150 evaluate-reverse-polish-notation Cpp Medium
151 reverse-words-in-a-string Cpp Medium
152 maximum-product-subarray Cpp Medium
153 find-minimum-in-rotated-sorted-array Cpp 📝 Medium
154 find-minimum-in-rotated-sorted-array-ii Cpp Hard
155 min-stack Cpp Easy
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 🔒 Hard
160 intersection-of-two-linked-lists Cpp 📝 Easy
161 one-edit-distance 🔒 Medium
162 find-peak-element Cpp 📝 Medium
163 missing-ranges 🔒 Medium
164 maximum-gap Cpp 📝 Hard
165 compare-version-numbers Javascript Cpp Medium
166 fraction-to-recurring-decimal Cpp 📝 Medium
167 two-sum-ii-input-array-is-sorted Cpp 📝 Easy
168 excel-sheet-column-title Cpp Easy
169 majority-element Javascript Cpp 📝 Easy
170 two-sum-iii-data-structure-design 🔒 Easy
171 excel-sheet-column-number Cpp Easy
172 factorial-trailing-zeroes Cpp Easy
173 binary-search-tree-iterator Cpp Medium
174 dungeon-game Cpp Hard
179 largest-number Cpp 📝 Medium
186 reverse-words-in-a-string-ii 🔒 Medium
187 repeated-dna-sequences Cpp Medium
188 best-time-to-buy-and-sell-stock-iv Cpp Hard
189 rotate-array Javascript Cpp 📝 Easy
190 reverse-bits Javascript Cpp Easy
191 number-of-1-bits Javascript Cpp 📝 Easy
198 house-robber Cpp 📝 Easy
199 binary-tree-right-side-view Cpp 📝 Medium
200 number-of-islands Cpp 📝 Medium
201 bitwise-and-of-numbers-range Cpp Medium
202 happy-number Cpp Easy
203 remove-linked-list-elements Cpp Easy
204 count-primes Cpp Easy
205 isomorphic-strings Javascript Cpp Easy
206 reverse-linked-list Cpp 📝 Easy
207 course-schedule Cpp Medium
208 implement-trie-prefix-tree Cpp 📝 Medium
209 minimum-size-subarray-sum Cpp 📝 Medium
210 course-schedule-ii Cpp Medium
211 add-and-search-word-data-structure-design Cpp Medium
212 word-search-ii Cpp Hard
213 house-robber-ii Cpp Medium
214 shortest-palindrome Cpp 📝 Hard
215 kth-largest-element-in-an-array Cpp Medium
216 combination-sum-iii Cpp Medium
217 contains-duplicate Javascript Cpp 📝 Easy
218 the-skyline-problem Cpp Hard
219 contains-duplicate-ii Javascript Cpp 📝 Easy
220 contains-duplicate-iii Cpp 📝 Medium
221 maximal-square Cpp 📝 Medium
222 count-complete-tree-nodes Cpp Medium
223 rectangle-area Cpp Medium
224 basic-calculator Cpp Hard
225 implement-stack-using-queues Javascript 📝 Easy
226 invert-binary-tree 📝 Easy
227 basic-calculator-ii Medium
228 summary-ranges 📝 Medium
229 majority-element-ii Medium
230 kth-smallest-element-in-a-bst Medium
231 power-of-two Easy
232 implement-queue-using-stacks 📝 Easy
233 number-of-digit-one 📝 Hard
234 palindrome-linked-list Easy
235 lowest-common-ancestor-of-a-binary-search-tree Easy
236 lowest-common-ancestor-of-a-binary-tree Medium
237 delete-node-in-a-linked-list 📝 Easy
238 product-of-array-except-self Medium
239 sliding-window-maximum Hard
240 search-a-2d-matrix-ii 📝 Medium
241 different-ways-to-add-parentheses Medium
242 valid-anagram 📝 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 🔒 Easy
257 binary-tree-paths Easy
258 add-digits 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 📝 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 🔒 Easy
277 find-the-celebrity 🔒 Medium
278 first-bad-version 📝 Easy
279 perfect-squares Medium
280 wiggle-sort 🔒 📝 Medium
281 zigzag-iterator 🔒 Medium
282 expression-add-operators 📝 Hard
283 move-zeroes 📝 Easy
284 peeking-iterator Medium
285 inorder-successor-in-bst 🔒 Medium
286 walls-and-gates 🔒 📝 Medium
287 find-the-duplicate-number 📝 Medium
288 unique-word-abbreviation 🔒 📝 Medium
289 game-of-life Medium
290 word-pattern Easy
291 word-pattern-ii 🔒 Hard
292 nim-game 📝 Easy
293 flip-game 🔒 Easy
294 flip-game-ii 🔒 Medium
295 find-median-from-data-stream 📝 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 📝 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 📝 Medium
308 range-sum-query-2d-mutable 🔒 Hard
309 best-time-to-buy-and-sell-stock-with-cooldown 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 Hard
317 shortest-distance-from-all-buildings 🔒 Hard
318 maximum-product-of-word-lengths 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 📝 Easy
327 count-of-range-sum Hard
328 odd-even-linked-list 📝 Medium
329 longest-increasing-path-in-a-matrix 📝 Hard
330 patching-array 📝 Hard
331 verify-preorder-serialization-of-a-binary-tree Medium
332 reconstruct-itinerary Medium
333 largest-bst-subtree 🔒 Medium
334 increasing-triplet-subsequence Medium
335 self-crossing Hard
336 palindrome-pairs Hard
337 house-robber-iii Medium
338 counting-bits 📝 Medium
339 nested-list-weight-sum 🔒 📝 Easy
340 longest-substring-with-at-most-k-distinct-characters 🔒 Hard
341 flatten-nested-list-iterator Medium
342 power-of-four Easy
343 integer-break Medium
344 reverse-string 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 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 Medium
369 plus-one-linked-list 🔒 Medium
370 range-addition 🔒 📝 Medium
371 sum-of-two-integers Cpp Easy
372 super-pow Medium
373 find-k-pairs-with-smallest-sums Medium
374 guess-number-higher-or-lower Cpp 📝 Easy
375 guess-number-higher-or-lower-ii 📝 Medium
376 wiggle-subsequence 📝 Medium
377 combination-sum-iv Medium
378 kth-smallest-element-in-a-sorted-matrix Medium
379 design-phone-directory 🔒 Medium
380 insert-delete-getrandom-o1 Medium
381 insert-delete-getrandom-o1-duplicates-allowed Hard
382 linked-list-random-node Medium
383 ransom-note Easy
384 shuffle-an-array 📝 Medium
385 mini-parser Medium
386 lexicographical-numbers Medium
387 first-unique-character-in-a-string Easy
388 longest-absolute-file-path Medium
389 find-the-difference Easy
390 elimination-game Medium
391 perfect-rectangle Hard
392 is-subsequence Medium
393 utf-8-validation Medium
394 decode-string 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 Easy
401 binary-watch Easy
402 remove-k-digits Medium
403 frog-jump 📝 Hard
404 sum-of-left-leaves Easy
405 convert-a-number-to-hexadecimal Easy
406 queue-reconstruction-by-height 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 📝 Medium
414 third-maximum-number Easy
415 add-strings Easy
416 partition-equal-subset-sum Medium
417 pacific-atlantic-water-flow 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 Easy
438 find-all-anagrams-in-a-string Easy
439 ternary-expression-parser 🔒 Medium
440 k-th-smallest-in-lexicographical-order Hard
441 arranging-coins Easy
442 find-all-duplicates-in-an-array Medium
443 string-compression 📝 Easy
444 sequence-reconstruction 🔒 Medium
445 add-two-numbers-ii Medium
446 arithmetic-slices-ii-subsequence 📝 Hard
447 number-of-boomerangs Easy
448 find-all-numbers-disappeared-in-an-array Easy
449 serialize-and-deserialize-bst Medium
450 delete-node-in-a-bst Medium
451 sort-characters-by-frequency Medium
452 minimum-number-of-arrows-to-burst-balloons Medium
453 minimum-moves-to-equal-array-elements 📝 Easy
454 4sum-ii Medium
455 assign-cookies Easy
456 132-pattern 📝 Medium
457 circular-array-loop Medium
458 poor-pigs Easy
459 repeated-substring-pattern Easy
460 lfu-cache Hard
461 hamming-distance Easy
462 minimum-moves-to-equal-array-elements-ii 📝 Medium
463 island-perimeter 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 Medium
469 convex-polygon 🔒 Medium
471 encode-string-with-shortest-length 🔒 Hard
472 concatenated-words Hard
473 matchsticks-to-square 📝 Medium
474 ones-and-zeroes 📝 Medium
475 heaters Easy
476 number-complement Easy
477 total-hamming-distance 📝 Medium
479 largest-palindrome-product Easy
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 Easy
486 predict-the-winner 📝 Medium
487 max-consecutive-ones-ii 🔒 Medium
488 zuma-game 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 Medium
496 next-greater-element-i 📝 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
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 Medium
520 detect-capital Easy
521 longest-uncommon-subsequence-i 📝 Easy
522 longest-uncommon-subsequence-ii 📝 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
529 minesweeper Medium
530 minimum-absolute-difference-in-bst Easy
531 lonely-pixel-i 🔒 Medium
532 k-diff-pairs-in-an-array Easy
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 📝 Easy
539 minimum-time-difference Medium
540 single-element-in-a-sorted-array Medium
541 reverse-string-ii 📝 Easy
542 01-matrix 📝 Medium
543 diameter-of-binary-tree 📝 Easy
544 output-contest-matches 🔒 📝 Medium
545 boundary-of-binary-tree 🔒 📝 Medium
546 remove-boxes 📝 Hard
547 friend-circles 📝 Medium
548 split-array-with-equal-sum 🔒 📝 Medium
549 binary-tree-longest-consecutive-sequence-ii 🔒 📝 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 📝 Easy
560 subarray-sum-equals-k 📝 Medium
561 array-partition-i 📝 Easy
562 longest-line-of-consecutive-one-in-matrix 🔒 📝 Medium
563 binary-tree-tilt 📝 Easy
564 find-the-closest-palindrome 📝 Hard
565 array-nesting 📝 Medium
566 reshape-the-matrix 📝 Easy
567 permutation-in-string 📝 Medium
568 maximum-vacation-days 🔒 📝 Hard
572 subtree-of-another-tree 📝 Easy
573 squirrel-simulation 🔒 📝 Medium
575 distribute-candies 📝 Easy
576 out-of-boundary-paths 📝 Medium
581 shortest-unsorted-continuous-subarray 📝 Easy
582 kill-process 🔒 📝 Medium
583 delete-operation-for-two-strings 📝 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 📝 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 🔒 📝 Easy
625 minimum-factorization 🔒 📝 Medium
628 maximum-product-of-three-numbers 📝 Easy
629 k-inverse-pairs-array 📝 Hard
630 course-schedule-iii 📝 Hard
631 design-excel-sum-formula 🔒 📝 Hard
632 smallest-range 📝 Hard
633 sum-of-square-numbers 📝 Easy
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 📝 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 📝 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 📝 Easy
666 path-sum-iv 🔒 📝 Medium
667 beautiful-arrangement-ii 📝 Medium
668 kth-smallest-number-in-multiplication-table 📝 Hard
669 trim-a-binary-search-tree 📝 Easy
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 📝 Easy
687 longest-univalue-path 📝 Easy
688 knight-probability-in-chessboard 📝 Medium
689 maximum-sum-of-3-non-overlapping-subarrays 📝 Hard
690 employee-importance 📝 Easy
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 📝 Easy
696 count-binary-substrings 📝 Easy
697 degree-of-an-array 📝 Easy
698 partition-to-k-equal-sum-subsets 📝 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 📝 Medium
719 find-k-th-smallest-pair-distance 📝 Hard
720 longest-word-in-dictionary 📝 Easy
721 accounts-merge 📝 Medium
722 remove-comments 📝 Medium
723 candy-crush 🔒 📝 Medium
724 find-pivot-index 📝 Easy
725 split-linked-list-in-parts 📝 Medium
726 number-of-atoms 📝 Hard
727 minimum-window-subsequence 🔒 📝 Hard
728 self-dividing-numbers 📝 Easy
729 my-calendar-i 📝 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 📝 Medium
741 cherry-pickup 📝 Hard
742 to-lower-case Easy
743 closest-leaf-in-a-binary-tree 🔒 📝 Medium
744 network-delay-time 📝 Medium
745 find-smallest-letter-greater-than-target 📝 Easy
746 prefix-and-suffix-search 📝 Hard
747 min-cost-climbing-stairs 📝 Easy
748 largest-number-at-least-twice-of-others 📝 Easy
749 shortest-completing-word 📝 Medium
750 contain-virus 📝 Hard
751 number-of-corner-rectangles 🔒 📝 Medium
752 ip-to-cidr 🔒 📝 Easy
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 🔒 📝 Easy
761 employee-free-time 🔒 📝 Hard
762 find-anagram-mappings 🔒 📝 Easy
763 special-binary-string 📝 Hard
764 n-ary-tree-level-order-traversal Easy
765 serialize-and-deserialize-n-ary-tree 🔒 Hard
766 flatten-a-multilevel-doubly-linked-list Medium
767 prime-number-of-set-bits-in-binary-representation 📝 Easy
768 partition-labels 📝 Medium
769 largest-plus-sign 📝 Medium
770 couples-holding-hands 📝 Hard
771 encode-n-ary-tree-to-binary-tree 🔒 Hard
772 construct-quad-tree Easy
773 quad-tree-intersection Easy
774 maximum-depth-of-n-ary-tree Easy
775 n-ary-tree-preorder-traversal 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 Easy
784 insert-into-a-binary-search-tree 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 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 📝 Easy
801 is-graph-bipartite 📝 Medium
802 k-th-smallest-prime-fraction 📝 Hard
803 cheapest-flights-within-k-stops 📝 Medium
804 rotated-digits 📝 Easy
805 escape-the-ghosts 📝 Medium
806 domino-and-tromino-tiling 📝 Medium
807 custom-sort-string 📝 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 📝 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 📝 Medium
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 📝 Easy
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 Easy
839 short-encoding-of-words 📝 Medium
841 shortest-distance-to-a-character 📝 Easy
842 card-flipping-game 📝 Medium
843 binary-trees-with-factors 📝 Medium
850 insert-into-a-cyclic-sorted-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 unique-letter-string 📝 Hard
856 consecutive-numbers-sum 📝 Medium
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 📝 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 📝 Easy
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 📝 Hard
878 shifting-letters 📝 Medium
879 maximize-distance-to-closest-person 📝 Easy
880 rectangle-area-ii 📝 Hard
881 loud-and-rich 📝 Medium
882 peak-index-in-a-mountain-array 📝 Easy
883 car-fleet 📝 Medium
884 k-similar-strings 📝 Hard
885 exam-room 📝 Medium
886 score-of-parentheses 📝 Medium
887 minimum-cost-to-hire-k-workers 📝 Hard
888 mirror-reflection 📝 Medium
889 buddy-strings 📝 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 📝 Easy
905 length-of-longest-fibonacci-subsequence 📝 Medium
906 walking-robot-simulation 📝 Easy
907 koko-eating-bananas 📝 Medium
908 middle-of-the-linked-list 📝 Easy
909 stone-game 📝 Medium
910 nth-magical-number 📝 Hard
911 profitable-schemes 📝 Hard
912 random-pick-with-weight 📝 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 📝 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 📝 Easy
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 📝 Hard
939 valid-permutations-for-di-sequence 📝 Hard