zecookiez/LeetCoder

As a New Year's challenge, this is a repo for solutions done for problems on Leetcode using C++.

LeetCode Problems and Solutions

Last Updated Problem Set: January 9, 2018

Repo format made by MrMiaoMiao

Note:

This repo is made so that I can track my progress starting January 2019 with the goal being at least 1 question per day. Most problems will be solved using C++ with the exception of Shell and Database questions. I will also try to comment my code as much as possible to make it more readable for future reference.

As my goal for 2019, I am aiming to learn C++ throughout these challenges and get familiar using git when working with Github. Runtime is not my main focus, however I will try to solve as many problems in the optimal time and memory complexity as possible.

In order to sort the table below (since Github doesn't allow it as of now), install the following:

1. Tampermonkey
   • Chrome
   • Firefox
2. Github Sort Content (Tampermonkey script)

Legend

Symbol	Description
⭕	Question Complete
🕒	Question in Progress
🐌	Suboptimal Solution
🔒	Question Locked (Premium)

Summary

#	Title	Difficulty	Category	Completion	Runtime
1	Two Sum	Easy	Algorithm	⭕	8ms
2	Add Two Numbers	Medium	Algorithm	⭕	60ms
3	Longest Substring Without Repeating Characters	Medium	Algorithm	⭕	24ms
4	Median of Two Sorted Arrays	Hard	Algorithm	🐌	52ms
5	Longest Palindromic Substring	Medium	Algorithm	⭕	12ms
6	ZigZag Conversion	Medium	Algorithm	⭕	36ms
7	Reverse Integer	Easy	Algorithm	⭕	16ms
8	String to Integer (atoi)	Medium	Algorithm	⭕	24ms
9	Palindrome Number	Easy	Algorithm	⭕	248ms
10	Regular Expression Matching	Hard	Algorithm	🕒
11	Container With Most Water	Medium	Algorithm	⭕	20ms
12	Integer to Roman	Medium	Algorithm	⭕	68ms
13	Roman to Integer	Easy	Algorithm	⭕	88ms
14	Longest Common Prefix	Easy	Algorithm	⭕	8ms
15	3Sum	Medium	Algorithm	⭕	104ms
16	3Sum Closest	Medium	Algorithm	⭕	8ms
17	Letter Combinations of a Phone Number	Medium	Algorithm	⭕	0ms
18	4Sum	Medium	Algorithm	⭕	52ms
19	Remove Nth Node From End of List	Medium	Algorithm	⭕	8ms
20	Valid Parentheses	Easy	Algorithm	⭕	4ms
21	Merge Two Sorted Lists	Easy	Algorithm	⭕	8ms
22	Generate Parentheses	Medium	Algorithm	⭕	0ms
23	Merge k Sorted Lists	Hard	Algorithm	⭕	28ms
24	Swap Nodes in Pairs	Medium	Algorithm	🕒
25	Reverse Nodes in k-Group	Hard	Algorithm	🕒
26	Remove Duplicates from Sorted Array	Easy	Algorithm	⭕	28ms
27	Remove Element	Easy	Algorithm	⭕	4ms
28	Implement strStr()	Easy	Algorithm	⭕	4ms
29	Divide Two Integers	Medium	Algorithm	⭕	12ms
30	Substring with Concatenation of All Words	Hard	Algorithm
31	Next Permutation	Medium	Algorithm
32	Longest Valid Parentheses	Hard	Algorithm
33	Search in Rotated Sorted Array	Medium	Algorithm
34	Find First and Last Position of Element in Sorted Array	Medium	Algorithm
35	Search Insert Position	Easy	Algorithm
36	Valid Sudoku	Medium	Algorithm
37	Sudoku Solver	Hard	Algorithm
38	Count and Say	Easy	Algorithm
39	Combination Sum	Medium	Algorithm
40	Combination Sum II	Medium	Algorithm
41	First Missing Positive	Hard	Algorithm
42	Trapping Rain Water	Hard	Algorithm
43	Multiply Strings	Medium	Algorithm
44	Wildcard Matching	Hard	Algorithm
45	Jump Game II	Hard	Algorithm
46	Permutations	Medium	Algorithm
47	Permutations II	Medium	Algorithm
48	Rotate Image	Medium	Algorithm
49	Group Anagrams	Medium	Algorithm
50	Pow(x, n)	Medium	Algorithm
51	N-Queens	Hard	Algorithm
52	N-Queens II	Hard	Algorithm
53	Maximum Subarray	Easy	Algorithm
54	Spiral Matrix	Medium	Algorithm
55	Jump Game	Medium	Algorithm
56	Merge Intervals	Medium	Algorithm
57	Insert Interval	Hard	Algorithm
58	Length of Last Word	Easy	Algorithm
59	Spiral Matrix II	Medium	Algorithm
60	Permutation Sequence	Medium	Algorithm
61	Rotate List	Medium	Algorithm
62	Unique Paths	Medium	Algorithm
63	Unique Paths II	Medium	Algorithm
64	Minimum Path Sum	Medium	Algorithm
65	Valid Number	Hard	Algorithm
66	Plus One	Easy	Algorithm
67	Add Binary	Easy	Algorithm
68	Text Justification	Hard	Algorithm
69	Sqrt(x)	Easy	Algorithm
70	Climbing Stairs	Easy	Algorithm
71	Simplify Path	Medium	Algorithm
72	Edit Distance	Hard	Algorithm
73	Set Matrix Zeroes	Medium	Algorithm
74	Search a 2D Matrix	Medium	Algorithm
75	Sort Colors	Medium	Algorithm
76	Minimum Window Substring	Hard	Algorithm
77	Combinations	Medium	Algorithm
78	Subsets	Medium	Algorithm
79	Word Search	Medium	Algorithm
80	Remove Duplicates from Sorted Array II	Medium	Algorithm
81	Search in Rotated Sorted Array II	Medium	Algorithm
82	Remove Duplicates from Sorted List II	Medium	Algorithm
83	Remove Duplicates from Sorted List	Easy	Algorithm
84	Largest Rectangle in Histogram	Hard	Algorithm
85	Maximal Rectangle	Hard	Algorithm
86	Partition List	Medium	Algorithm
87	Scramble String	Hard	Algorithm
88	Merge Sorted Array	Easy	Algorithm
89	Gray Code	Medium	Algorithm
90	Subsets II	Medium	Algorithm
91	Decode Ways	Medium	Algorithm
92	Reverse Linked List II	Medium	Algorithm
93	Restore IP Addresses	Medium	Algorithm
94	Binary Tree Inorder Traversal	Medium	Algorithm
95	Unique Binary Search Trees II	Medium	Algorithm
96	Unique Binary Search Trees	Medium	Algorithm
97	Interleaving String	Hard	Algorithm
98	Validate Binary Search Tree	Medium	Algorithm
99	Recover Binary Search Tree	Hard	Algorithm
100	Same Tree	Easy	Algorithm
101	Symmetric Tree	Easy	Algorithm
102	Binary Tree Level Order Traversal	Medium	Algorithm
103	Binary Tree Zigzag Level Order Traversal	Medium	Algorithm
104	Maximum Depth of Binary Tree	Easy	Algorithm
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Algorithm
106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	Algorithm
107	Binary Tree Level Order Traversal II	Easy	Algorithm
108	Convert Sorted Array to Binary Search Tree	Easy	Algorithm
109	Convert Sorted List to Binary Search Tree	Medium	Algorithm
110	Balanced Binary Tree	Easy	Algorithm
111	Minimum Depth of Binary Tree	Easy	Algorithm
112	Path Sum	Easy	Algorithm
113	Path Sum II	Medium	Algorithm
114	Flatten Binary Tree to Linked List	Medium	Algorithm
115	Distinct Subsequences	Hard	Algorithm
116	Populating Next Right Pointers in Each Node	Medium	Algorithm
117	Populating Next Right Pointers in Each Node II	Medium	Algorithm
118	Pascal's Triangle	Easy	Algorithm
119	Pascal's Triangle II	Easy	Algorithm
120	Triangle	Medium	Algorithm
121	Best Time to Buy and Sell Stock	Easy	Algorithm
122	Best Time to Buy and Sell Stock II	Easy	Algorithm
123	Best Time to Buy and Sell Stock III	Hard	Algorithm
124	Binary Tree Maximum Path Sum	Hard	Algorithm
125	Valid Palindrome	Easy	Algorithm
126	Word Ladder II	Hard	Algorithm
127	Word Ladder	Medium	Algorithm
128	Longest Consecutive Sequence	Hard	Algorithm
129	Sum Root to Leaf Numbers	Medium	Algorithm
130	Surrounded Regions	Medium	Algorithm
131	Palindrome Partitioning	Medium	Algorithm
132	Palindrome Partitioning II	Hard	Algorithm
133	Clone Graph	Medium	Algorithm
134	Gas Station	Medium	Algorithm
135	Candy	Hard	Algorithm
136	Single Number	Easy	Algorithm
137	Single Number II	Medium	Algorithm
138	Copy List with Random Pointer	Medium	Algorithm
139	Word Break	Medium	Algorithm
140	Word Break II	Hard	Algorithm
141	Linked List Cycle	Easy	Algorithm
142	Linked List Cycle II	Medium	Algorithm
143	Reorder List	Medium	Algorithm
144	Binary Tree Preorder Traversal	Medium	Algorithm
145	Binary Tree Postorder Traversal	Hard	Algorithm
146	LRU Cache	Hard	Algorithm
147	Insertion Sort List	Medium	Algorithm
148	Sort List	Medium	Algorithm
149	Max Points on a Line	Hard	Algorithm
150	Evaluate Reverse Polish Notation	Medium	Algorithm
151	Reverse Words in a String	Medium	Algorithm
152	Maximum Product Subarray	Medium	Algorithm
153	Find Minimum in Rotated Sorted Array	Medium	Algorithm
154	Find Minimum in Rotated Sorted Array II	Hard	Algorithm
155	Min Stack	Easy	Algorithm
156	Binary Tree Upside Down	Medium	Algorithm	🔒
157	Read N Characters Given Read4	Easy	Algorithm	🔒
158	Read N Characters Given Read4 II - Call multiple times	Hard	Algorithm	🔒
159	Longest Substring with At Most Two Distinct Characters	Hard	Algorithm	🔒
160	Intersection of Two Linked Lists	Easy	Algorithm
161	One Edit Distance	Medium	Algorithm	🔒
162	Find Peak Element	Medium	Algorithm
163	Missing Ranges	Medium	Algorithm	🔒
164	Maximum Gap	Hard	Algorithm
165	Compare Version Numbers	Medium	Algorithm
166	Fraction to Recurring Decimal	Medium	Algorithm
167	Two Sum II - Input array is sorted	Easy	Algorithm
168	Excel Sheet Column Title	Easy	Algorithm
169	Majority Element	Easy	Algorithm
170	Two Sum III - Data structure design	Easy	Algorithm	🔒
171	Excel Sheet Column Number	Easy	Algorithm
172	Factorial Trailing Zeroes	Easy	Algorithm
173	Binary Search Tree Iterator	Medium	Algorithm
174	Dungeon Game	Hard	Algorithm
175	Combine Two Tables	Easy	Database
176	Second Highest Salary	Easy	Database
177	Nth Highest Salary	Medium	Database
178	Rank Scores	Medium	Database
179	Largest Number	Medium	Algorithm
180	Consecutive Numbers	Medium	Database
181	Employees Earning More Than Their Managers	Easy	Database
182	Duplicate Emails	Easy	Database
183	Customers Who Never Order	Easy	Database
184	Department Highest Salary	Medium	Database
185	Department Top Three Salaries	Hard	Database
186	Reverse Words in a String II	Medium	Algorithm	🔒
187	Repeated DNA Sequences	Medium	Algorithm
188	Best Time to Buy and Sell Stock IV	Hard	Algorithm
189	Rotate Array	Easy	Algorithm
190	Reverse Bits	Easy	Algorithm
191	Number of 1 Bits	Easy	Algorithm
192	Word Frequency	Medium	Shell
193	Valid Phone Numbers	Easy	Shell
194	Transpose File	Medium	Shell
195	Tenth Line	Easy	Shell
196	Delete Duplicate Emails	Easy	Database
197	Rising Temperature	Easy	Database
198	House Robber	Easy	Algorithm
199	Binary Tree Right Side View	Medium	Algorithm
200	Number of Islands	Medium	Algorithm
201	Bitwise AND of Numbers Range	Medium	Algorithm
202	Happy Number	Easy	Algorithm
203	Remove Linked List Elements	Easy	Algorithm
204	Count Primes	Easy	Algorithm
205	Isomorphic Strings	Easy	Algorithm
206	Reverse Linked List	Easy	Algorithm
207	Course Schedule	Medium	Algorithm
208	Implement Trie (Prefix Tree)	Medium	Algorithm
209	Minimum Size Subarray Sum	Medium	Algorithm
210	Course Schedule II	Medium	Algorithm
211	Add and Search Word - Data structure design	Medium	Algorithm
212	Word Search II	Hard	Algorithm
213	House Robber II	Medium	Algorithm
214	Shortest Palindrome	Hard	Algorithm
215	Kth Largest Element in an Array	Medium	Algorithm
216	Combination Sum III	Medium	Algorithm
217	Contains Duplicate	Easy	Algorithm
218	The Skyline Problem	Hard	Algorithm
219	Contains Duplicate II	Easy	Algorithm
220	Contains Duplicate III	Medium	Algorithm
221	Maximal Square	Medium	Algorithm
222	Count Complete Tree Nodes	Medium	Algorithm
223	Rectangle Area	Medium	Algorithm
224	Basic Calculator	Hard	Algorithm
225	Implement Stack using Queues	Easy	Algorithm
226	Invert Binary Tree	Easy	Algorithm
227	Basic Calculator II	Medium	Algorithm
228	Summary Ranges	Medium	Algorithm
229	Majority Element II	Medium	Algorithm
230	Kth Smallest Element in a BST	Medium	Algorithm
231	Power of Two	Easy	Algorithm
232	Implement Queue using Stacks	Easy	Algorithm
233	Number of Digit One	Hard	Algorithm
234	Palindrome Linked List	Easy	Algorithm
235	Lowest Common Ancestor of a Binary Search Tree	Easy	Algorithm
236	Lowest Common Ancestor of a Binary Tree	Medium	Algorithm
237	Delete Node in a Linked List	Easy	Algorithm
238	Product of Array Except Self	Medium	Algorithm
239	Sliding Window Maximum	Hard	Algorithm
240	Search a 2D Matrix II	Medium	Algorithm
241	Different Ways to Add Parentheses	Medium	Algorithm
242	Valid Anagram	Easy	Algorithm
243	Shortest Word Distance	Easy	Algorithm	🔒
244	Shortest Word Distance II	Medium	Algorithm	🔒
245	Shortest Word Distance III	Medium	Algorithm	🔒
246	Strobogrammatic Number	Easy	Algorithm	🔒
247	Strobogrammatic Number II	Medium	Algorithm	🔒
248	Strobogrammatic Number III	Hard	Algorithm	🔒
249	Group Shifted Strings	Medium	Algorithm	🔒
250	Count Univalue Subtrees	Medium	Algorithm	🔒
251	Flatten 2D Vector	Medium	Algorithm	🔒
252	Meeting Rooms	Easy	Algorithm	🔒
253	Meeting Rooms II	Medium	Algorithm	🔒
254	Factor Combinations	Medium	Algorithm	🔒
255	Verify Preorder Sequence in Binary Search Tree	Medium	Algorithm	🔒
256	Paint House	Easy	Algorithm	🔒
257	Binary Tree Paths	Easy	Algorithm
258	Add Digits	Easy	Algorithm
259	3Sum Smaller	Medium	Algorithm	🔒
260	Single Number III	Medium	Algorithm
261	Graph Valid Tree	Medium	Algorithm	🔒
262	Trips and Users	Hard	Database
263	Ugly Number	Easy	Algorithm
264	Ugly Number II	Medium	Algorithm
265	Paint House II	Hard	Algorithm	🔒
266	Palindrome Permutation	Easy	Algorithm	🔒
267	Palindrome Permutation II	Medium	Algorithm	🔒
268	Missing Number	Easy	Algorithm
269	Alien Dictionary	Hard	Algorithm	🔒
270	Closest Binary Search Tree Value	Easy	Algorithm	🔒
271	Encode and Decode Strings	Medium	Algorithm	🔒
272	Closest Binary Search Tree Value II	Hard	Algorithm	🔒
273	Integer to English Words	Hard	Algorithm
274	H-Index	Medium	Algorithm
275	H-Index II	Medium	Algorithm
276	Paint Fence	Easy	Algorithm	🔒
277	Find the Celebrity	Medium	Algorithm	🔒
278	First Bad Version	Easy	Algorithm
279	Perfect Squares	Medium	Algorithm
280	Wiggle Sort	Medium	Algorithm	🔒
281	Zigzag Iterator	Medium	Algorithm	🔒
282	Expression Add Operators	Hard	Algorithm
283	Move Zeroes	Easy	Algorithm
284	Peeking Iterator	Medium	Algorithm
285	Inorder Successor in BST	Medium	Algorithm	🔒
286	Walls and Gates	Medium	Algorithm	🔒
287	Find the Duplicate Number	Medium	Algorithm
288	Unique Word Abbreviation	Medium	Algorithm	🔒
289	Game of Life	Medium	Algorithm
290	Word Pattern	Easy	Algorithm
291	Word Pattern II	Hard	Algorithm	🔒
292	Nim Game	Easy	Algorithm
293	Flip Game	Easy	Algorithm	🔒
294	Flip Game II	Medium	Algorithm	🔒
295	Find Median from Data Stream	Hard	Algorithm
296	Best Meeting Point	Hard	Algorithm	🔒
297	Serialize and Deserialize Binary Tree	Hard	Algorithm
298	Binary Tree Longest Consecutive Sequence	Medium	Algorithm	🔒
299	Bulls and Cows	Medium	Algorithm
300	Longest Increasing Subsequence	Medium	Algorithm
301	Remove Invalid Parentheses	Hard	Algorithm
302	Smallest Rectangle Enclosing Black Pixels	Hard	Algorithm	🔒
303	Range Sum Query - Immutable	Easy	Algorithm
304	Range Sum Query 2D - Immutable	Medium	Algorithm
305	Number of Islands II	Hard	Algorithm	🔒
306	Additive Number	Medium	Algorithm
307	Range Sum Query - Mutable	Medium	Algorithm
308	Range Sum Query 2D - Mutable	Hard	Algorithm	🔒
309	Best Time to Buy and Sell Stock with Cooldown	Medium	Algorithm
310	Minimum Height Trees	Medium	Algorithm
311	Sparse Matrix Multiplication	Medium	Algorithm	🔒
312	Burst Balloons	Hard	Algorithm
313	Super Ugly Number	Medium	Algorithm
314	Binary Tree Vertical Order Traversal	Medium	Algorithm	🔒
315	Count of Smaller Numbers After Self	Hard	Algorithm
316	Remove Duplicate Letters	Hard	Algorithm
317	Shortest Distance from All Buildings	Hard	Algorithm	🔒
318	Maximum Product of Word Lengths	Medium	Algorithm
319	Bulb Switcher	Medium	Algorithm
320	Generalized Abbreviation	Medium	Algorithm	🔒
321	Create Maximum Number	Hard	Algorithm
322	Coin Change	Medium	Algorithm
323	Number of Connected Components in an Undirected Graph	Medium	Algorithm	🔒
324	Wiggle Sort II	Medium	Algorithm
325	Maximum Size Subarray Sum Equals k	Medium	Algorithm	🔒
326	Power of Three	Easy	Algorithm
327	Count of Range Sum	Hard	Algorithm
328	Odd Even Linked List	Medium	Algorithm
329	Longest Increasing Path in a Matrix	Hard	Algorithm
330	Patching Array	Hard	Algorithm
331	Verify Preorder Serialization of a Binary Tree	Medium	Algorithm
332	Reconstruct Itinerary	Medium	Algorithm
333	Largest BST Subtree	Medium	Algorithm	🔒
334	Increasing Triplet Subsequence	Medium	Algorithm
335	Self Crossing	Hard	Algorithm
336	Palindrome Pairs	Hard	Algorithm
337	House Robber III	Medium	Algorithm
338	Counting Bits	Medium	Algorithm
339	Nested List Weight Sum	Easy	Algorithm	🔒
340	Longest Substring with At Most K Distinct Characters	Hard	Algorithm	🔒
341	Flatten Nested List Iterator	Medium	Algorithm
342	Power of Four	Easy	Algorithm
343	Integer Break	Medium	Algorithm
344	Reverse String	Easy	Algorithm
345	Reverse Vowels of a String	Easy	Algorithm
346	Moving Average from Data Stream	Easy	Algorithm	🔒
347	Top K Frequent Elements	Medium	Algorithm
348	Design Tic-Tac-Toe	Medium	Algorithm	🔒
349	Intersection of Two Arrays	Easy	Algorithm
350	Intersection of Two Arrays II	Easy	Algorithm
351	Android Unlock Patterns	Medium	Algorithm	🔒
352	Data Stream as Disjoint Intervals	Hard	Algorithm
353	Design Snake Game	Medium	Algorithm	🔒
354	Russian Doll Envelopes	Hard	Algorithm
355	Design Twitter	Medium	Algorithm
356	Line Reflection	Medium	Algorithm	🔒
357	Count Numbers with Unique Digits	Medium	Algorithm
358	Rearrange String k Distance Apart	Hard	Algorithm	🔒
359	Logger Rate Limiter	Easy	Algorithm	🔒
360	Sort Transformed Array	Medium	Algorithm	🔒
361	Bomb Enemy	Medium	Algorithm	🔒
362	Design Hit Counter	Medium	Algorithm	🔒
363	Max Sum of Rectangle No Larger Than K	Hard	Algorithm
364	Nested List Weight Sum II	Medium	Algorithm	🔒
365	Water and Jug Problem	Medium	Algorithm
366	Find Leaves of Binary Tree	Medium	Algorithm	🔒
367	Valid Perfect Square	Easy	Algorithm
368	Largest Divisible Subset	Medium	Algorithm
369	Plus One Linked List	Medium	Algorithm	🔒
370	Range Addition	Medium	Algorithm	🔒
371	Sum of Two Integers	Easy	Algorithm
372	Super Pow	Medium	Algorithm
373	Find K Pairs with Smallest Sums	Medium	Algorithm
374	Guess Number Higher or Lower	Easy	Algorithm
375	Guess Number Higher or Lower II	Medium	Algorithm
376	Wiggle Subsequence	Medium	Algorithm
377	Combination Sum IV	Medium	Algorithm
378	Kth Smallest Element in a Sorted Matrix	Medium	Algorithm
379	Design Phone Directory	Medium	Algorithm	🔒
380	Insert Delete GetRandom O(1)	Medium	Algorithm
381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	Algorithm
382	Linked List Random Node	Medium	Algorithm
383	Ransom Note	Easy	Algorithm
384	Shuffle an Array	Medium	Algorithm
385	Mini Parser	Medium	Algorithm
386	Lexicographical Numbers	Medium	Algorithm
387	First Unique Character in a String	Easy	Algorithm
388	Longest Absolute File Path	Medium	Algorithm
389	Find the Difference	Easy	Algorithm
390	Elimination Game	Medium	Algorithm
391	Perfect Rectangle	Hard	Algorithm
392	Is Subsequence	Medium	Algorithm
393	UTF-8 Validation	Medium	Algorithm
394	Decode String	Medium	Algorithm
395	Longest Substring with At Least K Repeating Characters	Medium	Algorithm
396	Rotate Function	Medium	Algorithm
397	Integer Replacement	Medium	Algorithm
398	Random Pick Index	Medium	Algorithm
399	Evaluate Division	Medium	Algorithm
400	Nth Digit	Easy	Algorithm
401	Binary Watch	Easy	Algorithm
402	Remove K Digits	Medium	Algorithm
403	Frog Jump	Hard	Algorithm
404	Sum of Left Leaves	Easy	Algorithm
405	Convert a Number to Hexadecimal	Easy	Algorithm
406	Queue Reconstruction by Height	Medium	Algorithm
407	Trapping Rain Water II	Hard	Algorithm
408	Valid Word Abbreviation	Easy	Algorithm	🔒
409	Longest Palindrome	Easy	Algorithm
410	Split Array Largest Sum	Hard	Algorithm
411	Minimum Unique Word Abbreviation	Hard	Algorithm	🔒
412	Fizz Buzz	Easy	Algorithm
413	Arithmetic Slices	Medium	Algorithm
414	Third Maximum Number	Easy	Algorithm
415	Add Strings	Easy	Algorithm
416	Partition Equal Subset Sum	Medium	Algorithm
417	Pacific Atlantic Water Flow	Medium	Algorithm
418	Sentence Screen Fitting	Medium	Algorithm	🔒
419	Battleships in a Board	Medium	Algorithm
420	Strong Password Checker	Hard	Algorithm
421	Maximum XOR of Two Numbers in an Array	Medium	Algorithm
422	Valid Word Square	Easy	Algorithm	🔒
423	Reconstruct Original Digits from English	Medium	Algorithm
424	Longest Repeating Character Replacement	Medium	Algorithm
425	Word Squares	Hard	Algorithm	🔒
426	Convert Binary Search Tree to Sorted Doubly Linked List	Medium	Algorithm	🔒
427	Construct Quad Tree	Easy	Algorithm
428	Serialize and Deserialize N-ary Tree	Hard	Algorithm	🔒
429	N-ary Tree Level Order Traversal	Easy	Algorithm
430	Flatten a Multilevel Doubly Linked List	Medium	Algorithm
431	Encode N-ary Tree to Binary Tree	Hard	Algorithm	🔒
432	All O`one Data Structure	Hard	Algorithm
433	Minimum Genetic Mutation	Medium	Algorithm
434	Number of Segments in a String	Easy	Algorithm
435	Non-overlapping Intervals	Medium	Algorithm
436	Find Right Interval	Medium	Algorithm
437	Path Sum III	Easy	Algorithm
438	Find All Anagrams in a String	Easy	Algorithm
439	Ternary Expression Parser	Medium	Algorithm	🔒
440	K-th Smallest in Lexicographical Order	Hard	Algorithm
441	Arranging Coins	Easy	Algorithm
442	Find All Duplicates in an Array	Medium	Algorithm
443	String Compression	Easy	Algorithm
444	Sequence Reconstruction	Medium	Algorithm	🔒
445	Add Two Numbers II	Medium	Algorithm
446	Arithmetic Slices II - Subsequence	Hard	Algorithm
447	Number of Boomerangs	Easy	Algorithm
448	Find All Numbers Disappeared in an Array	Easy	Algorithm
449	Serialize and Deserialize BST	Medium	Algorithm
450	Delete Node in a BST	Medium	Algorithm
451	Sort Characters By Frequency	Medium	Algorithm
452	Minimum Number of Arrows to Burst Balloons	Medium	Algorithm
453	Minimum Moves to Equal Array Elements	Easy	Algorithm
454	4Sum II	Medium	Algorithm
455	Assign Cookies	Easy	Algorithm
456	132 Pattern	Medium	Algorithm
457	Circular Array Loop	Medium	Algorithm
458	Poor Pigs	Easy	Algorithm
459	Repeated Substring Pattern	Easy	Algorithm
460	LFU Cache	Hard	Algorithm
461	Hamming Distance	Easy	Algorithm
462	Minimum Moves to Equal Array Elements II	Medium	Algorithm
463	Island Perimeter	Easy	Algorithm
464	Can I Win	Medium	Algorithm
465	Optimal Account Balancing	Hard	Algorithm	🔒
466	Count The Repetitions	Hard	Algorithm
467	Unique Substrings in Wraparound String	Medium	Algorithm
468	Validate IP Address	Medium	Algorithm
469	Convex Polygon	Medium	Algorithm	🔒
470	Implement Rand10() Using Rand7()	Medium	Algorithm
471	Encode String with Shortest Length	Hard	Algorithm	🔒
472	Concatenated Words	Hard	Algorithm
473	Matchsticks to Square	Medium	Algorithm
474	Ones and Zeroes	Medium	Algorithm
475	Heaters	Easy	Algorithm
476	Number Complement	Easy	Algorithm
477	Total Hamming Distance	Medium	Algorithm
478	Generate Random Point in a Circle	Medium	Algorithm
479	Largest Palindrome Product	Easy	Algorithm
480	Sliding Window Median	Hard	Algorithm
481	Magical String	Medium	Algorithm
482	License Key Formatting	Easy	Algorithm
483	Smallest Good Base	Hard	Algorithm
484	Find Permutation	Medium	Algorithm	🔒
485	Max Consecutive Ones	Easy	Algorithm
486	Predict the Winner	Medium	Algorithm
487	Max Consecutive Ones II	Medium	Algorithm	🔒
488	Zuma Game	Hard	Algorithm
489	Robot Room Cleaner	Hard	Algorithm	🔒
490	The Maze	Medium	Algorithm	🔒
491	Increasing Subsequences	Medium	Algorithm
492	Construct the Rectangle	Easy	Algorithm
493	Reverse Pairs	Hard	Algorithm
494	Target Sum	Medium	Algorithm
495	Teemo Attacking	Medium	Algorithm
496	Next Greater Element I	Easy	Algorithm
497	Random Point in Non-overlapping Rectangles	Medium	Algorithm
498	Diagonal Traverse	Medium	Algorithm
499	The Maze III	Hard	Algorithm	🔒
500	Keyboard Row	Easy	Algorithm
501	Find Mode in Binary Search Tree	Easy	Algorithm
502	IPO	Hard	Algorithm
503	Next Greater Element II	Medium	Algorithm
504	Base 7	Easy	Algorithm
505	The Maze II	Medium	Algorithm	🔒
506	Relative Ranks	Easy	Algorithm
507	Perfect Number	Easy	Algorithm
508	Most Frequent Subtree Sum	Medium	Algorithm
509	Fibonacci Number	Easy	Algorithm
513	Find Bottom Left Tree Value	Medium	Algorithm
514	Freedom Trail	Hard	Algorithm
515	Find Largest Value in Each Tree Row	Medium	Algorithm
516	Longest Palindromic Subsequence	Medium	Algorithm
517	Super Washing Machines	Hard	Algorithm
518	Coin Change 2	Medium	Algorithm
519	Random Flip Matrix	Medium	Algorithm
520	Detect Capital	Easy	Algorithm
521	Longest Uncommon Subsequence I	Easy	Algorithm
522	Longest Uncommon Subsequence II	Medium	Algorithm
523	Continuous Subarray Sum	Medium	Algorithm
524	Longest Word in Dictionary through Deleting	Medium	Algorithm
525	Contiguous Array	Medium	Algorithm
526	Beautiful Arrangement	Medium	Algorithm
527	Word Abbreviation	Hard	Algorithm	🔒
528	Random Pick with Weight	Medium	Algorithm
529	Minesweeper	Medium	Algorithm
530	Minimum Absolute Difference in BST	Easy	Algorithm
531	Lonely Pixel I	Medium	Algorithm	🔒
532	K-diff Pairs in an Array	Easy	Algorithm
533	Lonely Pixel II	Medium	Algorithm	🔒
535	Encode and Decode TinyURL	Medium	Algorithm
536	Construct Binary Tree from String	Medium	Algorithm	🔒
537	Complex Number Multiplication	Medium	Algorithm
538	Convert BST to Greater Tree	Easy	Algorithm
539	Minimum Time Difference	Medium	Algorithm
540	Single Element in a Sorted Array	Medium	Algorithm
541	Reverse String II	Easy	Algorithm
542	01 Matrix	Medium	Algorithm
543	Diameter of Binary Tree	Easy	Algorithm
544	Output Contest Matches	Medium	Algorithm	🔒
545	Boundary of Binary Tree	Medium	Algorithm	🔒
546	Remove Boxes	Hard	Algorithm
547	Friend Circles	Medium	Algorithm
548	Split Array with Equal Sum	Medium	Algorithm	🔒
549	Binary Tree Longest Consecutive Sequence II	Medium	Algorithm	🔒
551	Student Attendance Record I	Easy	Algorithm
552	Student Attendance Record II	Hard	Algorithm
553	Optimal Division	Medium	Algorithm
554	Brick Wall	Medium	Algorithm
555	Split Concatenated Strings	Medium	Algorithm	🔒
556	Next Greater Element III	Medium	Algorithm
557	Reverse Words in a String III	Easy	Algorithm
558	Quad Tree Intersection	Easy	Algorithm
559	Maximum Depth of N-ary Tree	Easy	Algorithm
560	Subarray Sum Equals K	Medium	Algorithm
561	Array Partition I	Easy	Algorithm
562	Longest Line of Consecutive One in Matrix	Medium	Algorithm	🔒
563	Binary Tree Tilt	Easy	Algorithm
564	Find the Closest Palindrome	Hard	Algorithm
565	Array Nesting	Medium	Algorithm
566	Reshape the Matrix	Easy	Algorithm
567	Permutation in String	Medium	Algorithm
568	Maximum Vacation Days	Hard	Algorithm	🔒
569	Median Employee Salary	Hard	Database	🔒
570	Managers with at Least 5 Direct Reports	Medium	Database	🔒
571	Find Median Given Frequency of Numbers	Hard	Database	🔒
572	Subtree of Another Tree	Easy	Algorithm
573	Squirrel Simulation	Medium	Algorithm	🔒
574	Winning Candidate	Medium	Database	🔒
575	Distribute Candies	Easy	Algorithm
576	Out of Boundary Paths	Medium	Algorithm
577	Employee Bonus	Easy	Database	🔒
578	Get Highest Answer Rate Question	Medium	Database	🔒
579	Find Cumulative Salary of an Employee	Hard	Database	🔒
580	Count Student Number in Departments	Medium	Database	🔒
581	Shortest Unsorted Continuous Subarray	Easy	Algorithm
582	Kill Process	Medium	Algorithm	🔒
583	Delete Operation for Two Strings	Medium	Algorithm
584	Find Customer Referee	Easy	Database	🔒
585	Investments in 2016	Medium	Database	🔒
586	Customer Placing the Largest Number of Orders	Easy	Database	🔒
587	Erect the Fence	Hard	Algorithm
588	Design In-Memory File System	Hard	Algorithm	🔒
589	N-ary Tree Preorder Traversal	Easy	Algorithm
590	N-ary Tree Postorder Traversal	Easy	Algorithm
591	Tag Validator	Hard	Algorithm
592	Fraction Addition and Subtraction	Medium	Algorithm
593	Valid Square	Medium	Algorithm
594	Longest Harmonious Subsequence	Easy	Algorithm
595	Big Countries	Easy	Database
596	Classes More Than 5 Students	Easy	Database
597	Friend Requests I: Overall Acceptance Rate	Easy	Database	🔒
598	Range Addition II	Easy	Algorithm
599	Minimum Index Sum of Two Lists	Easy	Algorithm
600	Non-negative Integers without Consecutive Ones	Hard	Algorithm
601	Human Traffic of Stadium	Hard	Database
602	Friend Requests II: Who Has the Most Friends	Medium	Database	🔒
603	Consecutive Available Seats	Easy	Database	🔒
604	Design Compressed String Iterator	Easy	Algorithm	🔒
605	Can Place Flowers	Easy	Algorithm
606	Construct String from Binary Tree	Easy	Algorithm
607	Sales Person	Easy	Database	🔒
608	Tree Node	Medium	Database	🔒
609	Find Duplicate File in System	Medium	Algorithm
610	Triangle Judgement	Easy	Database	🔒
611	Valid Triangle Number	Medium	Algorithm
612	Shortest Distance in a Plane	Medium	Database	🔒
613	Shortest Distance in a Line	Easy	Database	🔒
614	Second Degree Follower	Medium	Database	🔒
615	Average Salary: Departments VS Company	Hard	Database	🔒
616	Add Bold Tag in String	Medium	Algorithm	🔒
617	Merge Two Binary Trees	Easy	Algorithm
618	Students Report By Geography	Hard	Database	🔒
619	Biggest Single Number	Easy	Database	🔒
620	Not Boring Movies	Easy	Database
621	Task Scheduler	Medium	Algorithm
622	Design Circular Queue	Medium	Algorithm
623	Add One Row to Tree	Medium	Algorithm
624	Maximum Distance in Arrays	Easy	Algorithm	🔒
625	Minimum Factorization	Medium	Algorithm	🔒
626	Exchange Seats	Medium	Database
627	Swap Salary	Easy	Database
628	Maximum Product of Three Numbers	Easy	Algorithm
629	K Inverse Pairs Array	Hard	Algorithm
630	Course Schedule III	Hard	Algorithm
631	Design Excel Sum Formula	Hard	Algorithm	🔒
632	Smallest Range	Hard	Algorithm
633	Sum of Square Numbers	Easy	Algorithm
634	Find the Derangement of An Array	Medium	Algorithm	🔒
635	Design Log Storage System	Medium	Algorithm	🔒
636	Exclusive Time of Functions	Medium	Algorithm
637	Average of Levels in Binary Tree	Easy	Algorithm
638	Shopping Offers	Medium	Algorithm
639	Decode Ways II	Hard	Algorithm
640	Solve the Equation	Medium	Algorithm
641	Design Circular Deque	Medium	Algorithm
642	Design Search Autocomplete System	Hard	Algorithm	🔒
643	Maximum Average Subarray I	Easy	Algorithm
644	Maximum Average Subarray II	Hard	Algorithm	🔒
645	Set Mismatch	Easy	Algorithm
646	Maximum Length of Pair Chain	Medium	Algorithm
647	Palindromic Substrings	Medium	Algorithm
648	Replace Words	Medium	Algorithm
649	Dota2 Senate	Medium	Algorithm
650	2 Keys Keyboard	Medium	Algorithm
651	4 Keys Keyboard	Medium	Algorithm	🔒
652	Find Duplicate Subtrees	Medium	Algorithm
653	Two Sum IV - Input is a BST	Easy	Algorithm
654	Maximum Binary Tree	Medium	Algorithm
655	Print Binary Tree	Medium	Algorithm
656	Coin Path	Hard	Algorithm	🔒
657	Robot Return to Origin	Easy	Algorithm
658	Find K Closest Elements	Medium	Algorithm
659	Split Array into Consecutive Subsequences	Medium	Algorithm
660	Remove 9	Hard	Algorithm	🔒
661	Image Smoother	Easy	Algorithm
662	Maximum Width of Binary Tree	Medium	Algorithm
663	Equal Tree Partition	Medium	Algorithm	🔒
664	Strange Printer	Hard	Algorithm
665	Non-decreasing Array	Easy	Algorithm
666	Path Sum IV	Medium	Algorithm	🔒
667	Beautiful Arrangement II	Medium	Algorithm
668	Kth Smallest Number in Multiplication Table	Hard	Algorithm
669	Trim a Binary Search Tree	Easy	Algorithm
670	Maximum Swap	Medium	Algorithm
671	Second Minimum Node In a Binary Tree	Easy	Algorithm
672	Bulb Switcher II	Medium	Algorithm
673	Number of Longest Increasing Subsequence	Medium	Algorithm
674	Longest Continuous Increasing Subsequence	Easy	Algorithm
675	Cut Off Trees for Golf Event	Hard	Algorithm
676	Implement Magic Dictionary	Medium	Algorithm
677	Map Sum Pairs	Medium	Algorithm
678	Valid Parenthesis String	Medium	Algorithm
679	24 Game	Hard	Algorithm
680	Valid Palindrome II	Easy	Algorithm
681	Next Closest Time	Medium	Algorithm	🔒
682	Baseball Game	Easy	Algorithm
683	K Empty Slots	Hard	Algorithm	🔒
684	Redundant Connection	Medium	Algorithm
685	Redundant Connection II	Hard	Algorithm
686	Repeated String Match	Easy	Algorithm
687	Longest Univalue Path	Easy	Algorithm
688	Knight Probability in Chessboard	Medium	Algorithm
689	Maximum Sum of 3 Non-Overlapping Subarrays	Hard	Algorithm
690	Employee Importance	Easy	Algorithm
691	Stickers to Spell Word	Hard	Algorithm
692	Top K Frequent Words	Medium	Algorithm
693	Binary Number with Alternating Bits	Easy	Algorithm
694	Number of Distinct Islands	Medium	Algorithm	🔒
695	Max Area of Island	Medium	Algorithm
696	Count Binary Substrings	Easy	Algorithm
697	Degree of an Array	Easy	Algorithm
698	Partition to K Equal Sum Subsets	Medium	Algorithm
699	Falling Squares	Hard	Algorithm
700	Search in a Binary Search Tree	Easy	Algorithm
701	Insert into a Binary Search Tree	Medium	Algorithm
702	Search in a Sorted Array of Unknown Size	Medium	Algorithm	🔒
703	Kth Largest Element in a Stream	Easy	Algorithm
704	Binary Search	Easy	Algorithm
705	Design HashSet	Easy	Algorithm
706	Design HashMap	Easy	Algorithm
707	Design Linked List	Easy	Algorithm
708	Insert into a Cyclic Sorted List	Medium	Algorithm	🔒
709	To Lower Case	Easy	Algorithm
710	Random Pick with Blacklist	Hard	Algorithm
711	Number of Distinct Islands II	Hard	Algorithm	🔒
712	Minimum ASCII Delete Sum for Two Strings	Medium	Algorithm
713	Subarray Product Less Than K	Medium	Algorithm
714	Best Time to Buy and Sell Stock with Transaction Fee	Medium	Algorithm
715	Range Module	Hard	Algorithm
716	Max Stack	Easy	Algorithm	🔒
717	1-bit and 2-bit Characters	Easy	Algorithm
718	Maximum Length of Repeated Subarray	Medium	Algorithm
719	Find K-th Smallest Pair Distance	Hard	Algorithm
720	Longest Word in Dictionary	Easy	Algorithm
721	Accounts Merge	Medium	Algorithm
722	Remove Comments	Medium	Algorithm
723	Candy Crush	Medium	Algorithm	🔒
724	Find Pivot Index	Easy	Algorithm
725	Split Linked List in Parts	Medium	Algorithm
726	Number of Atoms	Hard	Algorithm
727	Minimum Window Subsequence	Hard	Algorithm	🔒
728	Self Dividing Numbers	Easy	Algorithm
729	My Calendar I	Medium	Algorithm
730	Count Different Palindromic Subsequences	Hard	Algorithm
731	My Calendar II	Medium	Algorithm
732	My Calendar III	Hard	Algorithm
733	Flood Fill	Easy	Algorithm
734	Sentence Similarity	Easy	Algorithm	🔒
735	Asteroid Collision	Medium	Algorithm
736	Parse Lisp Expression	Hard	Algorithm
737	Sentence Similarity II	Medium	Algorithm	🔒
738	Monotone Increasing Digits	Medium	Algorithm
739	Daily Temperatures	Medium	Algorithm
740	Delete and Earn	Medium	Algorithm
741	Cherry Pickup	Hard	Algorithm
742	Closest Leaf in a Binary Tree	Medium	Algorithm	🔒
743	Network Delay Time	Easy	Algorithm
744	Find Smallest Letter Greater Than Target	Easy	Algorithm
745	Prefix and Suffix Search	Hard	Algorithm
746	Min Cost Climbing Stairs	Easy	Algorithm
747	Largest Number At Least Twice of Others	Easy	Algorithm
748	Shortest Completing Word	Easy	Algorithm
749	Contain Virus	Hard	Algorithm
750	Number Of Corner Rectangles	Medium	Algorithm	🔒
751	IP to CIDR	Easy	Algorithm	🔒
752	Open the Lock	Medium	Algorithm
753	Cracking the Safe	Hard	Algorithm
754	Reach a Number	Easy	Algorithm
755	Pour Water	Medium	Algorithm	🔒
756	Pyramid Transition Matrix	Medium	Algorithm
757	Set Intersection Size At Least Two	Hard	Algorithm
758	Bold Words in String	Easy	Algorithm	🔒
759	Employee Free Time	Hard	Algorithm	🔒
760	Find Anagram Mappings	Easy	Algorithm	🔒
761	Special Binary String	Hard	Algorithm
762	Prime Number of Set Bits in Binary Representation	Easy	Algorithm
763	Partition Labels	Medium	Algorithm
764	Largest Plus Sign	Medium	Algorithm
765	Couples Holding Hands	Hard	Algorithm
766	Toeplitz Matrix	Easy	Algorithm
767	Reorganize String	Medium	Algorithm
768	Max Chunks To Make Sorted II	Hard	Algorithm
769	Max Chunks To Make Sorted	Medium	Algorithm
770	Basic Calculator IV	Hard	Algorithm
771	Jewels and Stones	Easy	Algorithm
772	Basic Calculator III	Hard	Algorithm	🔒
773	Sliding Puzzle	Hard	Algorithm
774	Minimize Max Distance to Gas Station	Hard	Algorithm	🔒
775	Global and Local Inversions	Medium	Algorithm
776	Split BST	Medium	Algorithm	🔒
777	Swap Adjacent in LR String	Medium	Algorithm
778	Swim in Rising Water	Hard	Algorithm
779	K-th Symbol in Grammar	Medium	Algorithm
780	Reaching Points	Hard	Algorithm
781	Rabbits in Forest	Medium	Algorithm
782	Transform to Chessboard	Hard	Algorithm
783	Minimum Distance Between BST Nodes	Easy	Algorithm
784	Letter Case Permutation	Easy	Algorithm
785	Is Graph Bipartite?	Medium	Algorithm
786	K-th Smallest Prime Fraction	Hard	Algorithm
787	Cheapest Flights Within K Stops	Medium	Algorithm
788	Rotated Digits	Easy	Algorithm
789	Escape The Ghosts	Medium	Algorithm
790	Domino and Tromino Tiling	Medium	Algorithm
791	Custom Sort String	Medium	Algorithm
792	Number of Matching Subsequences	Medium	Algorithm
793	Preimage Size of Factorial Zeroes Function	Hard	Algorithm
794	Valid Tic-Tac-Toe State	Medium	Algorithm
795	Number of Subarrays with Bounded Maximum	Medium	Algorithm
796	Rotate String	Easy	Algorithm
797	All Paths From Source to Target	Medium	Algorithm
798	Smallest Rotation with Highest Score	Hard	Algorithm
799	Champagne Tower	Medium	Algorithm
800	Similar RGB Color	Easy	Algorithm	🔒
801	Minimum Swaps To Make Sequences Increasing	Medium	Algorithm
802	Find Eventual Safe States	Medium	Algorithm
803	Bricks Falling When Hit	Hard	Algorithm
804	Unique Morse Code Words	Easy	Algorithm
805	Split Array With Same Average	Hard	Algorithm
806	Number of Lines To Write String	Easy	Algorithm
807	Max Increase to Keep City Skyline	Medium	Algorithm
808	Soup Servings	Medium	Algorithm
809	Expressive Words	Medium	Algorithm
810	Chalkboard XOR Game	Hard	Algorithm
811	Subdomain Visit Count	Easy	Algorithm
812	Largest Triangle Area	Easy	Algorithm
813	Largest Sum of Averages	Medium	Algorithm
814	Binary Tree Pruning	Medium	Algorithm
815	Bus Routes	Hard	Algorithm
816	Ambiguous Coordinates	Medium	Algorithm
817	Linked List Components	Medium	Algorithm
818	Race Car	Hard	Algorithm
819	Most Common Word	Easy	Algorithm
820	Short Encoding of Words	Medium	Algorithm
821	Shortest Distance to a Character	Easy	Algorithm
822	Card Flipping Game	Medium	Algorithm
823	Binary Trees With Factors	Medium	Algorithm
824	Goat Latin	Easy	Algorithm
825	Friends Of Appropriate Ages	Medium	Algorithm
826	Most Profit Assigning Work	Medium	Algorithm
827	Making A Large Island	Hard	Algorithm
828	Unique Letter String	Hard	Algorithm
829	Consecutive Numbers Sum	Hard	Algorithm
830	Positions of Large Groups	Easy	Algorithm
831	Masking Personal Information	Medium	Algorithm
832	Flipping an Image	Easy	Algorithm
833	Find And Replace in String	Medium	Algorithm
834	Sum of Distances in Tree	Hard	Algorithm
835	Image Overlap	Medium	Algorithm
836	Rectangle Overlap	Easy	Algorithm
837	New 21 Game	Medium	Algorithm
838	Push Dominoes	Medium	Algorithm
839	Similar String Groups	Hard	Algorithm
840	Magic Squares In Grid	Easy	Algorithm
841	Keys and Rooms	Medium	Algorithm
842	Split Array into Fibonacci Sequence	Medium	Algorithm
843	Guess the Word	Hard	Algorithm
844	Backspace String Compare	Easy	Algorithm
845	Longest Mountain in Array	Medium	Algorithm
846	Hand of Straights	Medium	Algorithm
847	Shortest Path Visiting All Nodes	Hard	Algorithm
848	Shifting Letters	Medium	Algorithm
849	Maximize Distance to Closest Person	Easy	Algorithm
850	Rectangle Area II	Hard	Algorithm
851	Loud and Rich	Medium	Algorithm
852	Peak Index in a Mountain Array	Easy	Algorithm
853	Car Fleet	Medium	Algorithm
854	K-Similar Strings	Hard	Algorithm
855	Exam Room	Medium	Algorithm
856	Score of Parentheses	Medium	Algorithm
857	Minimum Cost to Hire K Workers	Hard	Algorithm
858	Mirror Reflection	Medium	Algorithm
859	Buddy Strings	Easy	Algorithm
860	Lemonade Change	Easy	Algorithm
861	Score After Flipping Matrix	Medium	Algorithm
862	Shortest Subarray with Sum at Least K	Hard	Algorithm
863	All Nodes Distance K in Binary Tree	Medium	Algorithm
864	Shortest Path to Get All Keys	Hard	Algorithm
865	Smallest Subtree with all the Deepest Nodes	Medium	Algorithm
866	Prime Palindrome	Medium	Algorithm
867	Transpose Matrix	Easy	Algorithm
868	Binary Gap	Easy	Algorithm
869	Reordered Power of 2	Medium	Algorithm
870	Advantage Shuffle	Medium	Algorithm
871	Minimum Number of Refueling Stops	Hard	Algorithm
872	Leaf-Similar Trees	Easy	Algorithm
873	Length of Longest Fibonacci Subsequence	Medium	Algorithm
874	Walking Robot Simulation	Easy	Algorithm
875	Koko Eating Bananas	Medium	Algorithm
876	Middle of the Linked List	Easy	Algorithm
877	Stone Game	Medium	Algorithm
878	Nth Magical Number	Hard	Algorithm
879	Profitable Schemes	Hard	Algorithm
880	Decoded String at Index	Medium	Algorithm
881	Boats to Save People	Medium	Algorithm
882	Reachable Nodes In Subdivided Graph	Hard	Algorithm
883	Projection Area of 3D Shapes	Easy	Algorithm
884	Uncommon Words from Two Sentences	Easy	Algorithm
885	Spiral Matrix III	Medium	Algorithm
886	Possible Bipartition	Medium	Algorithm
887	Super Egg Drop	Hard	Algorithm
888	Fair Candy Swap	Easy	Algorithm
889	Construct Binary Tree from Preorder and Postorder Traversal	Medium	Algorithm
890	Find and Replace Pattern	Medium	Algorithm
891	Sum of Subsequence Widths	Hard	Algorithm
892	Surface Area of 3D Shapes	Easy	Algorithm
893	Groups of Special-Equivalent Strings	Easy	Algorithm
894	All Possible Full Binary Trees	Medium	Algorithm
895	Maximum Frequency Stack	Hard	Algorithm
896	Monotonic Array	Easy	Algorithm
897	Increasing Order Search Tree	Easy	Algorithm
898	Bitwise ORs of Subarrays	Medium	Algorithm
899	Orderly Queue	Hard	Algorithm
900	RLE Iterator	Medium	Algorithm
901	Online Stock Span	Medium	Algorithm
902	Numbers At Most N Given Digit Set	Hard	Algorithm
903	Valid Permutations for DI Sequence	Hard	Algorithm
904	Fruit Into Baskets	Medium	Algorithm
905	Sort Array By Parity	Easy	Algorithm
906	Super Palindromes	Hard	Algorithm
907	Sum of Subarray Minimums	Medium	Algorithm
908	Smallest Range I	Easy	Algorithm
909	Snakes and Ladders	Medium	Algorithm
910	Smallest Range II	Medium	Algorithm
911	Online Election	Medium	Algorithm
913	Cat and Mouse	Hard	Algorithm
914	X of a Kind in a Deck of Cards	Easy	Algorithm
915	Partition Array into Disjoint Intervals	Medium	Algorithm
916	Word Subsets	Medium	Algorithm
917	Reverse Only Letters	Easy	Algorithm
918	Maximum Sum Circular Subarray	Medium	Algorithm
919	Complete Binary Tree Inserter	Medium	Algorithm
920	Number of Music Playlists	Hard	Algorithm
921	Minimum Add to Make Parentheses Valid	Medium	Algorithm
922	Sort Array By Parity II	Easy	Algorithm
923	3Sum With Multiplicity	Medium	Algorithm
924	Minimize Malware Spread	Hard	Algorithm
925	Long Pressed Name	Easy	Algorithm
926	Flip String to Monotone Increasing	Medium	Algorithm
927	Three Equal Parts	Hard	Algorithm
928	Minimize Malware Spread II	Hard	Algorithm
929	Unique Email Addresses	Easy	Algorithm
930	Binary Subarrays With Sum	Medium	Algorithm
931	Minimum Falling Path Sum	Medium	Algorithm
932	Beautiful Array	Medium	Algorithm
933	Number of Recent Calls	Easy	Algorithm
934	Shortest Bridge	Medium	Algorithm
935	Knight Dialer	Medium	Algorithm
936	Stamping The Sequence	Hard	Algorithm
937	Reorder Log Files	Easy	Algorithm
938	Range Sum of BST	Medium	Algorithm
939	Minimum Area Rectangle	Medium	Algorithm
940	Distinct Subsequences II	Hard	Algorithm
941	Valid Mountain Array	Easy	Algorithm
942	DI String Match	Easy	Algorithm
943	Find the Shortest Superstring	Hard	Algorithm
944	Delete Columns to Make Sorted	Easy	Algorithm
945	Minimum Increment to Make Array Unique	Medium	Algorithm
946	Validate Stack Sequences	Medium	Algorithm
947	Most Stones Removed with Same Row or Column	Medium	Algorithm
948	Bag of Tokens	Medium	Algorithm
949	Largest Time for Given Digits	Easy	Algorithm
950	Reveal Cards In Increasing Order	Medium	Algorithm
951	Flip Equivalent Binary Trees	Medium	Algorithm
952	Largest Component Size by Common Factor	Hard	Algorithm
953	Verifying an Alien Dictionary	Easy	Algorithm
954	Array of Doubled Pairs	Medium	Algorithm
955	Delete Columns to Make Sorted II	Medium	Algorithm
956	Tallest Billboard	Hard	Algorithm
957	Prison Cells After N Days	Medium	Algorithm
958	Check Completeness of a Binary Tree	Medium	Algorithm
959	Regions Cut By Slashes	Medium	Algorithm
960	Delete Columns to Make Sorted III	Hard	Algorithm
961	N-Repeated Element in Size 2N Array	Easy	Algorithm
962	Maximum Width Ramp	Medium	Algorithm
963	Minimum Area Rectangle II	Medium	Algorithm
964	Least Operators to Express Number	Hard	Algorithm
965	Univalued Binary Tree	Easy	Algorithm
966	Vowel Spellchecker	Medium	Algorithm
967	Numbers With Same Consecutive Differences	Medium	Algorithm
968	Binary Tree Cameras	Hard	Algorithm
969	Pancake Sorting	Medium	Algorithm
970	Powerful Integers	Easy	Algorithm
971	Flip Binary Tree To Match Preorder Traversal	Medium	Algorithm
972	Equal Rational Numbers	Hard	Algorithm

Missing Numbers (idk why but if anyone was wondering)

• 510
• 511
• 512
• 534
• 550
• 912