LeetCode Solutions

LeetCode problems and solutions.

My profile on LeetCode: https://leetcode.com/u/SuxrobGM

#	Title	Solution	Difficulty
1	Two Sum	C#	Easy
2	Add Two Numbers	C#	Medium
3	Longest Substring Without Repeating Characters	C#	Medium
4	Median of Two Sorted Arrays	C#	Hard
4	Median of Two Sorted Arrays	Java	Hard
5	Longest Palindromic Substring	C#	Medium
6	Zigzag Conversion	C#	Medium
7	Reverse Integer	C#	Medium
8	String to Integer (atoi)	C#	Medium
9	Palindrome Number	C#	Easy
10	Regular Expression Matching	C#	Hard
11	Container With Most Water	C#	Medium
12	Integer to Roman	C#	Medium
13	Roman to Integer	C#	Easy
14	Longest Common Prefix	C#	Easy
15	3Sum	C#	Medium
16	3Sum Closest	C#	Medium
17	Letter Combinations of a Phone Number	C#	Medium
18	4Sum	C#	Medium
19	Remove Nth Node From End of List	C#	Medium
20	Valid Parentheses	C#	Easy
21	Merge Two Sorted Lists	C#	Easy
22	Generate Parentheses	C#	Medium
23	Merge k Sorted Lists	C#	Hard
24	Swap Nodes in Pairs	C#	Medium
25	Reverse Nodes in k-Group	C#	Hard
26	Remove Duplicates from Sorted Array	C#	Easy
27	Remove Element	C#	Easy
28	Find the Index of the First Occurrence in a String	C#	Easy
29	Divide Two Integers	C#	Medium
30	Substring with Concatenation of All Words	C#	Hard
31	Next Permutation	C#	Medium
32	Longest Valid Parentheses	C#	Hard
33	Search in Rotated Sorted Array	C#	Medium
34	Find First and Last Position of Element in Sorted Array	C#	Medium
35	Search Insert Position	C#	Easy
36	Valid Sudoku	C#	Medium
37	Sudoku Solver	C#	Hard
38	Count and Say	C#	Easy
39	Combination Sum	C#	Medium
40	Combination Sum II	C#	Medium
41	First Missing Positive	C#	Hard
42	Trapping Rain Water	C#	Hard
43	Multiply Strings	C#	Medium
44	Wildcard Matching	C#	Hard
45	Jump Game II	C#	Medium
46	Permutations	C#	Medium
47	Permutations II	C#	Medium
48	Rotate Image	C#	Medium
49	Group Anagrams	C#	Medium
50	Pow(x, n)	C#	Medium
51	N-Queens	C#	Hard
52	N-Queens II	C#	Hard
53	Maximum Subarray	C#	Easy
54	Spiral Matrix	C#	Medium
55	Jump Game	C#	Medium
56	Merge Intervals	C#	Medium
57	Insert Interval	C#	Medium
58	Length of Last Word	C#	Easy
59	Spiral Matrix II	C#	Medium
60	Permutation Sequence	C#	Hard
61	Rotate List	C#	Medium
62	Unique Paths	C#	Medium
63	Unique Paths II	C#	Medium
64	Minimum Path Sum	C#	Medium
65	Valid Number	C#	Hard
66	Plus One	C#	Easy
67	Add Binary	C#	Easy
68	Text Justification	C#	Hard
69	Sqrt(x)	C#	Easy
70	Climbing Stairs	Java	Easy
71	Simplify Path	C#	Medium
72	Edit Distance	C#	Medium
73	Set Matrix Zeroes	C#	Medium
74	Search a 2D Matrix	C#	Medium
75	Sort Colors	C#	Medium
76	Minimum Window Substring	C#	Hard
77	Combinations	C#	Medium
78	Subsets	C#	Medium
79	Word Search	C#	Medium
80	Remove Duplicates from Sorted Array II	C#	Medium
81	Search in Rotated Sorted Array II	C#	Medium
82	Remove Duplicates from Sorted List II	C#	Medium
83	Remove Duplicates from Sorted List	Java	Easy
84	Largest Rectangle in Histogram	C#	Hard
85	Maximal Rectangle	C#	Hard
86	Partition List	C#	Medium
87	Scramble String	C#	Hard
88	Merge Sorted Array	Java	Easy
88	Merge Sorted Array	C#	Easy
89	Gray Code	C#	Medium
90	Subsets II	C#	Medium
91	Decode Ways	C#	Medium
92	Reverse Linked List II	C#	Medium
93	Restore IP Addresses	C#	Medium
94	Binary Tree Inorder Traversal	Java	Easy
95	Unique Binary Search Trees II	C#	Medium
96	Unique Binary Search Trees	C#	Medium
97	Interleaving String	C#	Medium
98	Validate Binary Search Tree	C#	Medium
99	Recover Binary Search Tree	C#	Medium
100	Same Tree	Java	Easy
101	Symmetric Tree	Java	Easy
102	Binary Tree Level Order Traversal	C#	Medium
103	Binary Tree Zigzag Level Order Traversal	C#	Medium
104	Maximum Depth of Binary Tree	Java	Easy
105	Construct Binary Tree from Preorder and Inorder Traversal	C#	Medium
106	Construct Binary Tree from Inorder and Postorder Traversal	C#	Medium
107	Binary Tree Level Order Traversal II	C#	Medium
108	Convert Sorted Array to Binary Search Tree	Java	Easy
109	Convert Sorted List to Binary Search Tree	C#	Medium
110	Balanced Binary Tree	C#	Easy
111	Minimum Depth of Binary Tree	C#	Easy
112	Path Sum	C#	Easy
113	Path Sum II	C#	Medium
114	Flatten Binary Tree to Linked List	C#	Medium
115	Distinct Subsequences	C#	Hard
116	Populating Next Right Pointers in Each Node	C#	Medium
117	Populating Next Right Pointers in Each Node II	C#	Medium
118	Pascal's Triangle	C#	Easy
119	Pascal's Triangle II	C#	Easy
120	Triangle	C#	Medium
121	Best Time to Buy and Sell Stock	C#	Easy
122	Best Time to Buy and Sell Stock II	C#	Medium
123	Best Time to Buy and Sell Stock III	C#	Hard
125	Valid Palindrome	C#	Easy
127	Word Ladder	C#	Hard
128	Longest Consecutive Sequence	C#	Medium
129	Sum Root to Leaf Numbers	C#	Medium
130	Surrounded Regions	C#	Medium
131	Palindrome Partitioning	C#	Medium
132	Palindrome Partitioning II	C#	Hard
133	Clone Graph	C#	Medium
134	Gas Station	C#	Medium
135	Candy	C#	Hard
136	Single Number	C#	Easy
137	Single Number II	C#	Medium
138	Copy List with Random Pointer	C#	Medium
139	Word Break	C#	Medium
140	Word Break II	C#	Hard
141	Linked List Cycle	C#	Easy
142	Linked List Cycle II	C#	Medium
143	Reorder List	C#	Medium
144	Binary Tree Preorder Traversal	C#	Easy
145	Binary Tree Postorder Traversal	C#	Easy
146	LRU Cache	C#	Medium
147	Insertion Sort List	C#	Medium
148	Sort List	C#	Medium
149	Max Points on a Line	C#	Hard
150	Evaluate Reverse Polish Notation	C#	Medium
151	Reverse Words in a String	C#	Medium
152	Maximum Product Subarray	C#	Medium
153	Find Minimum in Rotated Sorted Array	C#	Medium
154	Find Minimum in Rotated Sorted Array II	C#	Hard
155	Min Stack	C#	Medium
160	Intersection of Two Linked Lists	C#	Easy
162	Find Peak Element	C#	Medium
164	Maximum Gap	C#	Medium
165	Compare Version Numbers	C#	Medium
166	Fraction to Recurring Decimal	C#	Medium
167	Two Sum II - Input Array Is Sorted	C#	Medium
168	Excel Sheet Column Title	C#	Easy
169	Majority Element	C#	Easy
171	Excel Sheet Column Number	C#	Easy
172	Factorial Trailing Zeroes	C#	Medium
173	Binary Search Tree Iterator	C#	Medium
174	Dungeon Game	C#	Hard
175	Combine Two Tables	SQL	Easy
176	Second Highest Salary	SQL	Medium
177	Nth Highest Salary	SQL	Medium
178	Rank Scores	SQL	Medium
179	Largest Number	C#	Medium
181	Employees Earning More Than Their Managers	SQL	Easy
187	Repeated DNA Sequences	C#	Medium
188	Best Time to Buy and Sell Stock IV	C#	Hard
189	Rotate Array	C#	Medium
190	Reverse Bits	C#	Easy
191	Number of 1 Bits	C#	Easy
192	Word Frequency	Shell	Medium
193	Valid Phone Numbers	Shell	Easy
194	Transpose File	Shell	Medium
195	Tenth Line	Shell	Easy
196	Delete Duplicate Emails	SQL	Easy
197	Rising Temperature	SQL	Easy
198	House Robber	C#	Medium
199	Binary Tree Right Side View	C#	Medium
200	Number of Islands	C#	Medium
201	Bitwise AND of Numbers Range	C#	Medium
202	Happy Number	C#	Easy
203	Remove Linked List Elements	C#	Easy
204	Count Primes	C#	Easy
205	Isomorphic Strings	C#	Easy
206	Reverse Linked List	C#	Easy
207	Course Schedule	C#	Medium
208	Implement Trie (Prefix Tree)	C#	Medium
209	Minimum Size Subarray Sum	C#	Medium
210	Course Schedule II	C#	Medium
211	Design Add and Search Words Data Structure	C#	Medium
212	Word Search II	C#	Hard
213	House Robber II	C#	Medium
214	Shortest Palindrome	C#	Hard
215	Kth Largest Element in an Array	C#	Medium
216	Combination Sum III	C#	Medium
217	Contains Duplicate	C#	Easy
218	The Skyline Problem	C#	Hard
219	Contains Duplicate II	C#	Medium
220	Contains Duplicate III	C#	Hard
221	Maximal Square	C#	Medium
222	Count Complete Tree Nodes	C#	Medium
223	Rectangle Area	C#	Medium
224	Basic Calculator	C#	Hard
225	Implement Stack using Queues	C#	Easy
226	Invert Binary Tree	C#	Easy
227	Basic Calculator II	C#	Medium
228	Summary Ranges	C#	Easy
229	Majority Element II	C#	Medium
230	Kth Smallest Element in a BST	C#	Medium
231	Power of Two	C#	Easy
232	Implement Queue using Stacks	C#	Easy
233	Number of Digit One	C#	Hard
234	Palindrome Linked List	C#	Easy
235	Lowest Common Ancestor of a Binary Search Tree	C#	Easy
236	Lowest Common Ancestor of a Binary Tree	C#	Medium
237	Delete Node in a Linked List	C#	Easy
238	Product of Array Except Self	C#	Medium
239	Sliding Window Maximum	C#	Hard
240	Search a 2D Matrix II	C#	Medium
241	Different Ways to Add Parentheses	C#	Medium
242	Valid Anagram	C#	Easy
257	Binary Tree Paths	C#	Easy
258	Add Digits	C#	Easy
260	Single Number III	C#	Medium
263	Ugly Number	C#	Easy
264	Ugly Number II	C#	Medium
268	Missing Number	C#	Easy
273	Integer to English Words	C#	Hard
274	H-Index	C#	Medium
275	H-Index II	C#	Medium
278	First Bad Version	C#	Easy
279	Perfect Squares	C#	Medium
282	Expression Add Operators	C#	Hard
283	Move Zeroes	C#	Easy
284	Peeking Iterator	C#	Medium
287	Find the Duplicate Number	C#	Medium
289	Game of Life	C#	Medium
290	Word Pattern	C#	Easy
292	Nim Game	C#	Easy
295	Find Median from Data Stream	C#	Hard
297	Serialize and Deserialize Binary Tree	C#	Hard
299	Bulls and Cows	C#	Medium
300	Longest Increasing Subsequence	C#	Medium
301	Remove Invalid Parentheses	C#	Hard
303	Range Sum Query - Immutable	C#	Easy
304	Range Sum Query 2D - Immutable	C#	Medium
306	Additive Number	C#	Medium
307	Range Sum Query - Mutable	C#	Medium
308	Range Sum Query 2D - Mutable	C#	Hard
309	Best Time to Buy and Sell Stock with Cooldown	C#	Medium
310	Minimum Height Trees	C#	Medium
312	Burst Balloons	C#	Hard
315	Count of Smaller Numbers After Self	C#	Hard
316	Remove Duplicate Letters	C#	Medium
318	Maximum Product of Word Lengths	C#	Medium
319	Bulb Switcher	C#	Medium
321	Create Maximum Number	C#	Hard
322	Coin Change	C#	Medium
324	Wiggle Sort II	C#	Medium
327	Count of Range Sum	C#	Hard
328	Odd Even Linked List	C#	Medium
329	Longest Increasing Path in a Matrix	C#	Hard
330	Patching Array	C#	Hard
331	Verify Preorder Serialization of a Binary Tree	C#	Medium
332	Reconstruct Itinerary	C#	Medium
334	Increasing Triplet Subsequence	C#	Medium
335	Self Crossing	C#	Hard
337	House Robber III	C#	Medium
338	Counting Bits	C#	Medium
341	Flatten Nested List Iterator	C#	Medium
342	Power of Four	C#	Easy
343	Integer Break	C#	Medium
344	Reverse String	C#	Easy
345	Reverse Vowels of a String	C#	Easy
347	Top K Frequent Elements	C#	Medium
349	Intersection of Two Arrays	C#	Easy
350	Intersection of Two Arrays II	C#	Easy
352	Data Stream as Disjoint Intervals	C#	Hard
355	Design Twitter	C#	Medium
357	Count Numbers with Unique Digits	C#	Medium
365	Water and Jug Problem	C#	Medium
367	Valid Perfect Square	C#	Easy
368	Largest Divisible Subset	C#	Medium
371	Sum of Two Integers	C#	Easy
372	Super Pow	C#	Medium
373	Find K Pairs with Smallest Sums	C#	Medium
374	Guess Number Higher or Lower	C#	Easy
375	Guess Number Higher or Lower II	C#	Medium
376	Wiggle Subsequence	C#	Medium
377	Combination Sum IV	C#	Medium
378	Kth Smallest Element in a Sorted Matrix	C#	Medium
380	Insert Delete GetRandom O(1)	C#	Medium
381	Insert Delete GetRandom O(1) - Duplicates allowed	C#	Hard
382	Linked List Random Node	C#	Medium
383	Ransom Note	C#	Easy
384	Shuffle an Array	C#	Medium
385	Mini Parser	C#	Medium
386	Lexicographical Numbers	C#	Medium
387	First Unique Character in a String	C#	Easy
388	Longest Absolute File Path	C#	Medium
389	Find the Difference	C#	Easy
390	Elimination Game	C#	Medium
391	Perfect Rectangle	C#	Hard
392	Is Subsequence	C#	Easy
393	UTF-8 Validation	C#	Medium
394	Decode String	C#	Medium
395	Longest Substring with At Least K Repeating Characters	C#	Medium
396	Rotate Function	C#	Medium
397	Integer Replacement	C#	Medium
398	Random Pick Index	C#	Medium
399	Evaluate Division	C#	Medium
400	Nth Digit	C#	Easy
401	Binary Watch	C#	Easy
402	Remove K Digits	C#	Medium
403	Frog Jump	C#	Hard
404	Sum of Left Leaves	C#	Easy
405	Convert a Number to Hexadecimal	C#	Easy
406	Queue Reconstruction by Height	C#	Medium
407	Trapping Rain Water II	C#	Hard
409	Longest Palindrome	C#	Easy
410	Split Array Largest Sum	C#	Hard
412	Fizz Buzz	C#	Easy
413	Arithmetic Slices	C#	Medium
414	Third Maximum Number	C#	Easy
415	Add Strings	C#	Easy
416	Partition Equal Subset Sum	C#	Medium
417	Pacific Atlantic Water Flow	C#	Medium
419	Battleships in a Board	C#	Medium
420	Strong Password Checker	C#	Hard
421	Maximum XOR of Two Numbers in an Array	C#	Medium
423	Reconstruct Original Digits from English	C#	Medium
424	Longest Repeating Character Replacement	C#	Medium
427	Construct Quad Tree	C#	Medium
429	N-ary Tree Level Order Traversal	C#	Medium
430	Flatten a Multilevel Doubly Linked List	C#	Medium
432	All O`one Data Structure	C#	Hard
433	Minimum Genetic Mutation	C#	Medium
434	Number of Segments in a String	C#	Easy
435	Non-overlapping Intervals	C#	Medium
436	Find Right Interval	C#	Medium
437	Path Sum III	C#	Easy
438	Find All Anagrams in a String	C#	Medium
440	K-th Smallest in Lexicographical Order	C#	Hard
441	Arranging Coins	C#	Easy
442	Find All Duplicates in an Array	C#	Medium
443	String Compression	C#	Easy
445	Add Two Numbers II	C#	Medium
446	Arithmetic Slices II - Subsequence	C#	Hard
447	Number of Boomerangs	C#	Easy
448	Find All Numbers Disappeared in an Array	C#	Easy
449	Serialize and Deserialize BST	C#	Medium
450	Delete Node in a BST	C#	Medium
451	Sort Characters By Frequency	C#	Medium
452	Minimum Number of Arrows to Burst Balloons	C#	Medium
453	Minimum Moves to Equal Array Elements	C#	Medium
454	4Sum II	C#	Medium
455	Assign Cookies	C#	Easy
456	132 Pattern	C#	Medium
458	Poor Pigs	C#	Hard
459	Repeated Substring Pattern	C#	Easy
460	LFU Cache	C#	Hard
461	Hamming Distance	C#	Easy
462	Minimum Moves to Equal Array Elements II	C#	Medium
463	Island Perimeter	C#	Easy
464	Can I Win	C#	Medium
466	Count The Repetitions	C#	Hard
467	Unique Substrings in Wraparound String	C#	Medium
468	Validate IP Address	C#	Medium
470	Implement Rand10() Using Rand7()	C#	Medium
472	Concatenated Words	C#	Hard
473	Matchsticks to Square	C#	Medium
474	Ones and Zeroes	C#	Medium
475	Heaters	C#	Medium
476	Number Complement	C#	Easy
477	Total Hamming Distance	C#	Medium
478	Generate Random Point in a Circle	C#	Medium
481	Magical String	C#	Medium
482	License Key Formatting	C#	Easy
483	Smallest Good Base	C#	Hard
485	Max Consecutive Ones	C#	Easy
486	Predict the Winner	C#	Medium
491	Increasing Subsequences	C#	Medium
492	Construct the Rectangle	C#	Easy
493	Reverse Pairs	C#	Hard
494	Target Sum	C#	Medium
495	Teemo Attacking	C#	Medium
496	Next Greater Element I	C#	Easy
497	Random Point in Non-overlapping Rectangles	C#	Medium
498	Diagonal Traverse	C#	Medium
500	Keyboard Row	C#	Easy
501	Find Mode in Binary Search Tree	C#	Easy
502	IPO	C#	Hard
503	Next Greater Element II	C#	Medium
504	Base 7	C#	Easy
506	Relative Ranks	C#	Easy
507	Perfect Number	C#	Easy
508	Most Frequent Subtree Sum	C#	Medium
509	Fibonacci Number	C#	Easy
511	Game Play Analysis I	SQL	Easy
513	Find Bottom Left Tree Value	C#	Medium
514	Freedom Trail	C#	Hard
515	Find Largest Value in Each Tree Row	C#	Medium
516	Longest Palindromic Subsequence	C#	Medium
517	Super Washing Machines	C#	Hard
518	Coin Change 2	C#	Medium
519	Random Flip Matrix	C#	Medium
520	Detect Capital	C#	Easy
521	Longest Uncommon Subsequence I	C#	Easy
522	Longest Uncommon Subsequence II	C#	Medium
523	Continuous Subarray Sum	C#	Medium
524	Longest Word in Dictionary through Deleting	C#	Medium
525	Contiguous Array	C#	Medium
526	Beautiful Arrangement	C#	Medium
528	Random Pick with Weight	C#	Medium
529	Minesweeper	C#	Medium
530	Minimum Absolute Difference in BST	C#	Easy
532	K-diff Pairs in an Array	C#	Medium
535	Encode and Decode TinyURL	C#	Medium
537	Complex Number Multiplication	C#	Medium
538	Convert BST to Greater Tree	C#	Easy
539	Minimum Time Difference	C#	Medium
540	Single Element in a Sorted Array	C#	Medium
541	Reverse String II	C#	Easy
542	01 Matrix	C#	Medium
543	Diameter of Binary Tree	C#	Easy
546	Remove Boxes	C#	Hard
547	Number of Provinces	C#	Medium
550	Game Play Analysis IV	SQL	Easy
551	Student Attendance Record I	C#	Easy
552	Student Attendance Record II	C#	Hard
553	Optimal Division	C#	Medium
554	Brick Wall	C#	Medium
556	Next Greater Element III	C#	Medium
557	Reverse Words in a String III	C#	Easy
558	Logical OR of Two Binary Grids Represented as Quad-Trees	C#	Medium
559	Maximum Depth of N-ary Tree	C#	Easy
560	Subarray Sum Equals K	C#	Medium
561	Array Partition I	C#	Easy
563	Binary Tree Tilt	C#	Easy
565	Array Nesting	C#	Medium
566	Reshape the Matrix	C#	Easy
567	Permutation in String	C#	Medium
570	Managers with at Least 5 Direct Reports	SQL	Medium
572	Subtree of Another Tree	C#	Easy
575	Distribute Candies	C#	Easy
576	Out of Boundary Paths	C#	Medium
577	Employee Bonus	SQL	Easy
581	Shortest Unsorted Continuous Subarray	C#	Medium
583	Delete Operation for Two Strings	C#	Medium
584	Find Customer Referee	SQL	Easy
585	Investments in 2016	SQL	Medium
586	Customer Placing the Largest Number of Orders	SQL	Easy
587	Erect the Fence	C#	Hard
589	N-ary Tree Preorder Traversal	C#	Easy
590	N-ary Tree Postorder Traversal	C#	Easy
591	Tag Validator	C#	Hard
592	Fraction Addition and Subtraction	C#	Medium
593	Valid Square	C#	Medium
594	Longest Harmonious Subsequence	C#	Easy
595	Big Countries	SQL	Easy
596	Classes More Than 5 Students	SQL	Easy
598	Range Addition II	C#	Easy
599	Minimum Index Sum of Two Lists	C#	Easy
600	Non-negative Integers without Consecutive Ones	C#	Hard
601	Human Traffic of Stadium	SQL	Hard
602	Friend Requests I: Overall Acceptance Rate	SQL	Medium
605	Can Place Flowers	C#	Easy
606	Construct String from Binary Tree	C#	Easy
607	Sales Person	SQL	Easy
608	Tree Node	SQL	Easy
609	Find Duplicate File in System	C#	Medium
610	Triangle Judgement	SQL	Easy
611	Valid Triangle Number	C#	Medium
617	Merge Two Binary Trees	C#	Easy
619	Biggest Single Number	SQL	Easy
620	Not Boring Movies	SQL	Easy
621	Task Scheduler	C#	Medium
622	Design Circular Queue	C#	Medium
623	Add One Row to Tree	C#	Medium
624	Maximum Distance in Arrays	C#	Medium
626	Exchange Seats	SQL	Medium
627	Swap Salary	SQL	Easy
628	Maximum Product of Three Numbers	C#	Easy
629	K Inverse Pairs Array	C#	Hard
630	Course Schedule III	C#	Hard
633	Sum of Square Numbers	C#	Medium
636	Exclusive Time of Functions	C#	Medium
637	Average of Levels in Binary Tree	C#	Easy
638	Shopping Offers	C#	Medium
639	Decode Ways II	C#	Hard
640	Solve the Equation	C#	Medium
641	Design Circular Deque	C#	Medium
643	Maximum Average Subarray I	C#	Easy
645	Set Mismatch	C#	Easy
646	Maximum Length of Pair Chain	C#	Medium
647	Palindromic Substrings	C#	Medium
648	Replace Words	C#	Medium
649	Dota2 Senate	C#	Medium
650	2 Keys Keyboard	C#	Medium
652	Find Duplicate Subtrees	C#	Medium
653	Two Sum IV - Input is a BST	C#	Easy
654	Maximum Binary Tree	C#	Medium
655	Print Binary Tree	C#	Medium
657	Robot Return to Origin	C#	Easy
658	Find K Closest Elements	C#	Medium
659	Split Array into Consecutive Subsequences	C#	Medium
661	Image Smoother	C#	Easy
662	Maximum Width of Binary Tree	C#	Medium
664	Strange Printer	C#	Hard
665	Non-decreasing Array	C#	Easy
667	Beautiful Arrangement II	C#	Medium
668	Kth Smallest Number in Multiplication Table	C#	Hard
669	Trim a Binary Search Tree	C#	Medium
670	Maximum Swap	C#	Medium
671	Second Minimum Node In a Binary Tree	C#	Easy
672	Bulb Switcher II	C#	Medium
673	Number of Longest Increasing Subsequence	C#	Medium
674	Longest Continuous Increasing Subsequence	C#	Easy
675	Cut Off Trees for Golf Event	C#	Hard
676	Implement Magic Dictionary	C#	Medium
677	Map Sum Pairs	C#	Medium
678	Valid Parenthesis String	C#	Medium
679	24 Game	C#	Hard
680	Valid Palindrome II	C#	Easy
682	Baseball Game	C#	Easy
684	Redundant Connection	C#	Medium
685	Redundant Connection II	C#	Hard
686	Repeated String Match	C#	Easy
687	Longest Univalue Path	C#	Easy
688	Knight Probability in Chessboard	C#	Medium
689	Maximum Sum of 3 Non-Overlapping Subarrays	C#	Hard
690	Employee Importance	C#	Easy
691	Stickers to Spell Word	C#	Hard
692	Top K Frequent Words	C#	Medium
693	Binary Number with Alternating Bits	C#	Easy
695	Max Area of Island	C#	Medium
696	Count Binary Substrings	C#	Easy
697	Degree of an Array	C#	Easy
698	Partition to K Equal Sum Subsets	C#	Medium
699	Falling Squares	C#	Hard
700	Search in a Binary Search Tree	C#	Easy
701	Insert into a Binary Search Tree	C#	Medium
703	Kth Largest Element in a Stream	C#	Easy
704	Binary Search	C#	Easy
705	Design HashSet	C#	Easy
706	Design HashMap	C#	Easy
707	Design Linked List	C#	Medium
709	To Lower Case	C#	Easy
710	Random Pick with Blacklist	C#	Hard
712	Minimum ASCII Delete Sum for Two Strings	C#	Medium
713	Subarray Product Less Than K	C#	Medium
714	Best Time to Buy and Sell Stock with Transaction Fee	C#	Medium
717	1-bit and 2-bit Characters	C#	Easy
718	Maximum Length of Repeated Subarray	C#	Medium
719	Find K-th Smallest Pair Distance	C#	Hard
720	Longest Word in Dictionary	C#	Easy
722	Remove Comments	C#	Medium
724	Find Pivot Index	C#	Easy
725	Split Linked List in Parts	C#	Medium
728	Self Dividing Numbers	C#	Easy
729	My Calendar I	C#	Medium
731	My Calendar II	C#	Medium
732	My Calendar III	C#	Hard
733	Flood Fill	C#	Easy
735	Asteroid Collision	C#	Medium
736	Parse Lisp Expression	C#	Hard
738	Monotone Increasing Digits	C#	Medium
739	Daily Temperatures	C#	Medium
740	Delete and Earn	C#	Medium
741	Cherry Pickup	C#	Hard
743	Network Delay Time	C#	Medium
744	Find Smallest Letter Greater Than Target	C#	Easy
746	Min Cost Climbing Stairs	C#	Easy
747	Largest Number At Least Twice of Others	C#	Easy
748	Shortest Completing Word	C#	Easy
749	Contain Virus	C#	Hard
752	Open the Lock	C#	Medium
753	Cracking the Safe	C#	Hard
754	Reach a Number	C#	Medium
756	Pyramid Transition Matrix	C#	Medium
761	Special Binary String	C#	Hard
762	Prime Number of Set Bits in Binary Representation	C#	Easy
763	Partition Labels	C#	Medium
764	Largest Plus Sign	C#	Medium
765	Couples Holding Hands	C#	Hard
766	Toeplitz Matrix	C#	Easy
767	Reorganize String	C#	Medium
768	Max Chunks To Make Sorted II	C#	Hard
769	Max Chunks To Make Sorted	C#	Medium
771	Jewels and Stones	C#	Easy
773	Sliding Puzzle	C#	Hard
775	Global and Local Inversions	C#	Medium
777	Swap Adjacent in LR String	C#	Medium
778	Swim in Rising Water	C#	Hard
779	K-th Symbol in Grammar	C#	Medium
780	Reaching Points	C#	Hard
781	Rabbits in Forest	C#	Medium
782	Transform to Chessboard	C#	Hard
783	Minimum Distance Between BST Nodes	C#	Easy
785	Is Graph Bipartite?	C#	Medium
786	K-th Smallest Prime Fraction	C#	Hard
787	Cheapest Flights Within K Stops	C#	Medium
788	Rotated Digits	C#	Easy
789	Escape The Ghosts	C#	Medium
790	Domino and Tromino Tiling	C#	Medium
791	Custom Sort String	C#	Medium
792	Number of Matching Subsequences	C#	Medium
793	Preimage Size of Factorial Zeroes Function	C#	Hard
794	Valid Tic-Tac-Toe State	C#	Medium
795	Number of Subarrays with Bounded Maximum	C#	Medium
796	Rotate String	C#	Easy
797	All Paths From Source to Target	C#	Medium
798	Smallest Rotation with Highest Score	C#	Hard
799	Champagne Tower	C#	Medium
801	Minimum Swaps To Make Sequences Increasing	C#	Hard
802	Find Eventual Safe States	C#	Medium
804	Unique Morse Code Words	C#	Easy
805	Split Array With Same Average	C#	Hard
806	Number of Lines To Write String	C#	Easy
807	Max Increase to Keep City Skyline	C#	Medium
808	Soup Servings	C#	Medium
809	Expressive Words	C#	Medium
810	Chalkboard XOR Game	C#	Hard
811	Subdomain Visit Count	C#	Easy
812	Largest Triangle Area	C#	Easy
813	Largest Sum of Averages	C#	Medium
814	Binary Tree Pruning	C#	Medium
815	Bus Routes	C#	Hard
816	Ambiguous Coordinates	C#	Medium
817	Linked List Components	C#	Medium
818	Race Car	C#	Hard
819	Most Common Word	C#	Easy
820	Short Encoding of Words	C#	Medium
821	Shortest Distance to a Character	C#	Easy
822	Card Flipping Game	C#	Medium
823	Binary Trees With Factors	C#	Medium
824	Goat Latin	C#	Easy
825	Friends Of Appropriate Ages	C#	Medium
826	Most Profit Assigning Work	C#	Medium
827	Making A Large Island	C#	Hard
828	Unique Letter String	C#	Hard
829	Consecutive Numbers Sum	C#	Hard
830	Positions of Large Groups	C#	Easy
831	Masking Personal Information	C#	Medium
832	Flipping an Image	C#	Easy
833	Find And Replace in String	C#	Medium
834	Sum of Distances in Tree	C#	Hard
835	Image Overlap	C#	Medium
836	Rectangle Overlap	C#	Easy
887	Super Egg Drop	C#	Hard
837	New 21 Game	C#	Medium
838	Push Dominoes	C#	Medium
839	Similar String Groups	C#	Hard
840	Magic Squares In Grid	C#	Easy
841	Keys and Rooms	C#	Medium
842	Split Array into Fibonacci Sequence	C#	Medium
844	Backspace String Compare	C#	Easy
845	Longest Mountain in Array	C#	Medium
846	Hand of Straights	C#	Medium
847	Shortest Path Visiting All Nodes	C#	Hard
848	Shifting Letters	C#	Medium
849	Maximize Distance to Closest Person	C#	Medium
851	Loud and Rich	C#	Medium
852	Peak Index in a Mountain Array	C#	Medium
853	Car Fleet	C#	Medium
854	K-Similar Strings	C#	Hard
855	Exam Room	C#	Medium
856	Score of Parentheses	C#	Medium
857	Minimum Cost to Hire K Workers	C#	Hard
858	Mirror Reflection	C#	Medium
859	Buddy Strings	C#	Easy
860	Lemonade Change	C#	Easy
861	Score After Flipping Matrix	C#	Medium
862	Shortest Subarray with Sum at Least K	C#	Hard
863	All Nodes Distance K in Binary Tree	C#	Medium
864	Shortest Path to Get All Keys	C#	Hard
865	Smallest Subtree with all the Deepest Nodes	C#	Medium
866	Prime Palindrome	C#	Medium
867	Transpose Matrix	C#	Easy
868	Binary Gap	C#	Easy
869	Reordered Power of 2	C#	Medium
870	Advantage Shuffle	C#	Medium
871	Minimum Number of Refueling Stops	C#	Hard
872	Leaf-Similar Trees	C#	Easy
873	Length of Longest Fibonacci Subsequence	C#	Medium
874	Walking Robot Simulation	C#	Easy
875	Koko Eating Bananas	C#	Medium
876	Middle of the Linked List	C#	Easy
877	Stone Game	C#	Medium
878	Nth Magical Number	C#	Hard
879	Profitable Schemes	C#	Hard
881	Boats to Save People	C#	Medium
882	Reachable Nodes In Subdivided Graph	C#	Hard
883	Projection Area of 3D Shapes	C#	Easy
884	Uncommon Words from Two Sentences	C#	Easy
885	Spiral Matrix III	C#	Medium
886	Possible Bipartition	C#	Medium
887	Super Egg Drop	C#	Hard
888	Fair Candy Swap	C#	Easy
889	Construct Binary Tree from Preorder and Postorder Traversal	C#	Medium
890	Find and Replace Pattern	C#	Medium
891	Sum of Subsequence Widths	C#	Hard
892	Surface Area of 3D Shapes	C#	Easy
893	Groups of Special-Equivalent Strings	C#	Medium
894	All Possible Full Binary Trees	C#	Medium
895	Maximum Frequency Stack	C#	Hard
896	Monotonic Array	C#	Easy
897	Increasing Order Search Tree	C#	Easy
898	Bitwise ORs of Subarrays	C#	Medium
899	Orderly Queue	C#	Hard
900	RLE Iterator	C#	Medium
901	Online Stock Span	C#	Medium
902	Numbers At Most N Given Digit Set	C#	Hard
903	Valid Permutations for DI Sequence	C#	Hard
904	Fruit Into Baskets	C#	Medium
905	Sort Array By Parity	C#	Easy
906	Super Palindromes	C#	Hard
907	Sum of Subarray Minimums	C#	Medium
908	Smallest Range I	C#	Easy
909	Snakes and Ladders	C#	Medium
910	Smallest Range II	C#	Medium
911	Online Election	C#	Medium
912	Sort an Array	C#	Medium
914	X of a Kind in a Deck of Cards	C#	Easy
915	Partition Array into Disjoint Intervals	C#	Medium
916	Word Subsets	C#	Medium
917	Reverse Only Letters	C#	Easy
918	Maximum Sum Circular Subarray	C#	Medium
919	Complete Binary Tree Inserter	C#	Medium
920	Number of Music Playlists	C#	Hard
921	Minimum Add to Make Parentheses Valid	C#	Medium
922	Sort Array By Parity II	C#	Easy
923	3Sum With Multiplicity	C#	Medium
924	Minimize Malware Spread	C#	Hard
925	Long Pressed Name	C#	Easy
926	Flip String to Monotone Increasing	C#	Medium
927	Three Equal Parts	C#	Hard
929	Unique Email Addresses	C#	Easy
930	Binary Subarrays With Sum	C#	Medium
931	Minimum Falling Path Sum	C#	Medium
932	Minimum Add to Make Parentheses Valid	C#	Medium
933	Number of Recent Calls	C#	Easy
934	Shortest Bridge	C#	Medium
935	Knight Dialer	C#	Medium
936	Stamping The Sequence	C#	Hard
937	Reorder Data in Log Files	C#	Medium
938	Range Sum of BST	C#	Easy
939	Minimum Area Rectangle	C#	Medium
940	Distinct Subsequences II	C#	Hard
941	Valid Mountain Array	C#	Easy
942	DI String Match	C#	Easy
943	Find the Shortest Superstring	C#	Hard
944	Delete Columns to Make Sorted	C#	Easy
945	Minimum Increment to Make Array Unique	C#	Medium
946	Validate Stack Sequences	C#	Medium
947	Most Stones Removed with Same Row or Column	C#	Medium
948	Bag of Tokens	C#	Medium
949	Largest Time for Given Digits	C#	Medium
950	Reveal Cards In Increasing Order	C#	Medium
951	Flip Equivalent Binary Trees	C#	Medium
952	Largest Component Size by Common Factor	C#	Hard
953	Verifying an Alien Dictionary	C#	Easy
954	Array of Doubled Pairs	C#	Medium
955	Delete Columns to Make Sorted II	C#	Medium
956	Tallest Billboard	C#	Hard
957	Prison Cells After N Days	C#	Medium
958	Check Completeness of a Binary Tree	C#	Medium
959	Regions Cut By Slashes	C#	Medium
960	Delete Columns to Make Sorted III	C#	Hard
961	N-Repeated Element in Size 2N Array	C#	Easy
962	Maximum Width Ramp	C#	Medium
963	Minimum Area Rectangle II	C#	Medium
965	Univalued Binary Tree	C#	Easy
966	Vowel Spellchecker	C#	Medium
967	Numbers With Same Consecutive Differences	C#	Medium
968	Binary Tree Cameras	C#	Hard
969	Pancake Sorting	C#	Medium
970	Powerful Integers	C#	Medium
971	Flip Binary Tree To Match Preorder Traversal	C#	Medium
973	K Closest Points to Origin	C#	Medium
974	Subarray Sums Divisible by K	C#	Medium
975	Odd Even Jump	C#	Hard
976	Largest Perimeter Triangle	C#	Easy
977	Squares of a Sorted Array	C#	Easy
978	Longest Turbulent Subarray	C#	Medium
979	Distribute Coins in Binary Tree	C#	Medium
980	Unique Paths III	C#	Hard
981	Time Based Key-Value Store	C#	Medium
982	Triples with Bitwise AND Equal To Zero	C#	Hard
983	Minimum Cost For Tickets	C#	Medium
984	String Without AAA or BBB	C#	Medium
985	Sum of Even Numbers After Queries	C#	Easy
986	Interval List Intersections	C#	Medium
987	Vertical Order Traversal of a Binary Tree	C#	Hard
988	Smallest String Starting From Leaf	C#	Medium
989	Add to Array-Form of Integer	C#	Easy
990	Satisfiability of Equality Equations	C#	Medium
991	Broken Calculator	C#	Medium
992	Subarrays with K Different Integers	C#	Hard
993	Cousins in Binary Tree	C#	Easy
994	Rotting Oranges	C#	Medium
995	Minimum Number of K Consecutive Bit Flips	C#	Hard
996	Number of Squareful Arrays	C#	Hard
997	Find the Town Judge	C#	Easy
998	Maximum Binary Tree II	C#	Medium
999	Available Captures for Rook	C#	Easy
1000	Minimum Cost to Merge Stones	C#	Hard
1001	Grid Illumination	C#	Hard
1002	Find Common Characters	C#	Easy
1003	Check If Word Is Valid After Substitutions	C#	Medium
1004	Max Consecutive Ones III	C#	Medium
1005	Maximize Sum Of Array After K Negations	C#	Easy
1006	Clumsy Factorial	C#	Medium
1007	Minimum Domino Rotations For Equal Row	C#	Medium
1008	Construct Binary Search Tree from Preorder Traversal	C#	Medium
1009	Complement of Base 10 Integer	C#	Easy
1010	Pairs of Songs With Total Durations Divisible by 60	C#	Medium
1011	Capacity To Ship Packages Within D Days	C#	Medium
1012	Numbers With Repeated Digits	C#	Hard
1013	Partition Array Into Three Parts With Equal Sum	C#	Easy
1014	Best Sightseeing Pair	C#	Medium
1015	Smallest Integer Divisible by K	C#	Medium
1016	Binary String With Substrings Representing 1 To N	C#	Medium
1017	Convert to Base -2	C#	Medium
1018	Binary Prefix Divisible By 5	C#	Easy
1019	Next Greater Node In Linked List	C#	Medium
1020	Number of Enclaves	C#	Medium
1021	Remove Outermost Parentheses	C#	Easy
1022	Sum of Root To Leaf Binary Numbers	C#	Easy
1023	Camelcase Matching	C#	Medium
1024	Video Stitching	C#	Medium
1025	Divisor Game	C#	Easy
1026	Maximum Difference Between Node and Ancestor	C#	Medium
1027	Longest Arithmetic Sequence	C#	Medium
1028	Recover a Tree From Preorder Traversal	C#	Hard
1029	Two City Scheduling	C#	Medium
1030	Matrix Cells in Distance Order	C#	Easy
1031	Maximum Sum of Two Non-Overlapping Subarrays	C#	Medium
1032	Stream of Characters	C#	Hard
1033	Moving Stones Until Consecutive	C#	Easy
1034	Coloring A Border	C#	Medium
1035	Uncrossed Lines	C#	Medium
1036	Escape a Large Maze	C#	Hard
1037	Valid Boomerang	C#	Easy
1038	Binary Search Tree to Greater Sum Tree	C#	Medium
1039	Minimum Score Triangulation of Polygon	C#	Medium
1040	Moving Stones Until Consecutive II	C#	Medium
1041	Robot Bounded In Circle	C#	Medium
1042	Flower Planting With No Adjacent	C#	Medium
1043	Partition Array for Maximum Sum	C#	Medium
1045	Customers Who Bought All Products	SQL	Medium
1046	Last Stone Weight	C#	Easy
1047	Remove All Adjacent Duplicates In String	C#	Easy
1048	Longest String Chain	C#	Medium
1049	Last Stone Weight II	C#	Medium
1050	Actors and Directors Who Cooperated At Least Three Times	SQL	Medium
1051	Height Checker	C#	Easy
1052	Grumpy Bookstore Owner	C#	Medium
1053	Previous Permutation With One Swap	C#	Medium
1054	Distant Barcodes	C#	Medium
1061	Lexicographically Smallest Equivalent String	C#	Medium
1068	Product Sales Analysis II	SQL	Easy
1070	Product Sales Analysis I	SQL	Easy
1071	Greatest Common Divisor of Strings	C#	Easy
1072	Flip Columns For Maximum Number of Equal Rows	C#	Medium
1073	Adding Two Negabinary Numbers	C#	Medium
1074	Number of Submatrices That Sum to Target	C#	Hard
1075	Project Employees I	SQL	Easy
1078	Occurrences After Bigram	C#	Easy
1079	Letter Tile Possibilities	C#	Medium
1080	Insufficient Nodes in Root to Leaf Paths	C#	Medium
1081	Smallest Subsequence of Distinct Characters	C#	Medium
1084	Sales Analysis III	SQL	Easy
1089	Duplicate Zeros	C#	Easy
1090	Largest Values From Labels	C#	Medium
1091	Shortest Path in Binary Matrix	C#	Medium
1092	Shortest Common Supersequence	C#	Hard
1093	Statistics from a Large Sample	C#	Medium
1094	Car Pooling	C#	Medium
1095	Find in Mountain Array	C#	Hard
1096	Brace Expansion II	C#	Hard
1103	Distribute Candies to People	C#	Easy
1104	Path In Zigzag Labelled Binary Tree	C#	Medium
1105	Filling Bookcase Shelves	C#	Medium
1106	Parsing A Boolean Expression	C#	Hard
1108	Defanging an IP Address	C#	Easy
1109	Corporate Flight Bookings	C#	Medium
1110	Delete Nodes And Return Forest	C#	Medium
1111	Maximum Nesting Depth of Two Valid Parentheses Strings	C#	Medium
1114	Print in Order	C#	Easy
1115	Print FooBar Alternately	C#	Medium
1116	Print Zero Even Odd	C#	Medium
1117	Building H2O	C#	Medium
1122	Relative Sort Array	C#	Easy
1123	Lowest Common Ancestor of Deepest Leaves	C#	Medium
1124	Longest Well-Performing Interval	C#	Medium
1125	Smallest Sufficient Team	C#	Hard
1128	Number of Equivalent Domino Pairs	C#	Easy
1129	Shortest Path with Alternating Colors	C#	Medium
1130	Minimum Cost Tree From Leaf Values	C#	Medium
1131	Maximum of Absolute Value Expression	C#	Medium
1132	Report Contiguous Dates	SQL	Easy
1139	Largest 1-Bordered Square	C#	Medium
1140	Stone Game II	C#	Medium
1141	User Activity for the Past 30 Days I	SQL	Easy
1143	Longest Common Subsequence	C#	Medium
1144	Decrease Elements To Make Array Zigzag	C#	Medium
1145	Binary Tree Coloring Game	C#	Medium
1146	Snapshot Array	C#	Medium
1147	Longest Chunked Palindrome Decomposition	C#	Hard
1148	Article Views I	SQL	Easy
1154	Day of the Year	C#	Easy
1155	Number of Dice Rolls With Target Sum	C#	Medium
1156	Swap For Longest Repeated Character Substring	C#	Medium
1157	Online Majority Element In Subarray	C#	Hard
1158	Market Analysis I	SQL	Easy
1160	Find Words That Can Be Formed by Characters	C#	Easy
1161	Maximum Level Sum of a Binary Tree	C#	Medium
1162	As Far from Land as Possible	C#	Medium
1163	Last Substring in Lexicographical Order	C#	Hard
1164	Product Sales Analysis III	SQL	Easy
1169	Invalid Transactions	C#	Medium
1170	Compare Strings by Frequency of the Smallest Character	C#	Medium
1171	Remove Zero Sum Consecutive Nodes from Linked List	C#	Medium
1172	Goat Latin	C#	Easy
1174	Immediate Food Delivery I	SQL	Easy
1175	Prime Arrangements	C#	Easy
1177	Can Make Palindrome from Substring	C#	Medium
1178	Number of Valid Words for Each Puzzle	C#	Medium
1179	Reformat Department Table	SQL	Easy
1184	Distance Between Bus Stops	C#	Easy
1185	Day of the Week	C#	Easy
1186	Maximum Subarray Sum with One Deletion	C#	Medium
1187	Easiest Problem Ever	C#	Easy
1189	Maximum Number of Balloons	C#	Easy
1190	Reverse Substrings Between Each Pair of Parentheses	C#	Medium
1191	K Concatenation Maximum Sum	C#	Medium
1192	Critical Connections in a Network	C#	Hard
1193	Monthly Transactions I	SQL	Easy
1195	Fizz Buzz Multithreaded	C#	Medium
1200	Minimum Absolute Difference	C#	Easy
1201	Ugly Number III	C#	Medium
1202	Smallest String With Swaps	C#	Medium
1203	Sort Items by Groups Respecting Dependencies	C#	Hard
1204	Last Person to Fit in the Bus	SQL	Medium
1206	Design Skiplist	C#	Hard
1207	Unique Number of Occurrences	C#	Easy
1431	Kids With the Greatest Number of Candies	C#	Easy
1433	Check If a String Can Break Another String	C#	Medium
1768	Merge Strings Alternately	C#	Easy
1971	Find if Path Exists in Graph	C#	Easy
2620	Counter	TypeScript	Easy
2622	Cache With Time Limit	TypeScript	Medium
2621	Sleep	TypeScript	Easy
2623	Memoize	TypeScript	Medium
2625	Flatten Deeply Nested Array	TypeScript	Medium
2626	Array Reduce Transformation	TypeScript	Easy
2627	Debounce	TypeScript	Medium
2629	Function Composition	TypeScript	Easy
2631	Group By	TypeScript	Medium
2634	Filter Elements from Array	TypeScript	Easy
2635	Apply Transform Over Each Element in Array	TypeScript	Easy
2637	Promise Time Limit	TypeScript	Medium
2665	Counter II	TypeScript	Easy
2666	Allow One Function Call	TypeScript	Easy
2667	Create Hello World Function	TypeScript	Easy
2677	Array Prototype Last	TypeScript	Easy
2694	Event Emitter	TypeScript	Medium
2695	Array Wrapper	TypeScript	Easy
2703	Return Length of Arguments Passed	TypeScript	Easy
2704	To Be Or Not To Be	TypeScript	Easy
2705	Compact Object	TypeScript	Medium
2715	Timeout Cancellation	TypeScript	Easy
2721	Execute Asynchronous Functions in Parallel	TypeScript	Medium
2722	Join Two Arrays by ID	TypeScript	Medium
2723	Add Two Promises	TypeScript	Easy
2724	Sort By	TypeScript	Easy
2725	Interval Cancellation	TypeScript	Easy
2726	Calculator with Method Chaining	TypeScript	Easy
2727	Is Object Empty	TypeScript	Easy