LeetCode

My solutions to LeetCode problems in Python3, JS and Java.

C++ solutions are to be added in the second round.

(Notes: 📘 means you need to buy a book from Leetcode)

#	Title	C++	Java	Javascript	Python3	Difficulty
754	Cracking the Safe					Hard
753	Open the Lock					Medium
752	IP to CIDR					Medium
751	Number Of Corner Rectangles 📘					Medium
750	Contain Virus					Hard
749	Shortest Completing Word					Medium
748	Largest Number Greater Than Twice of Others					Easy
747	Min Cost Climbing Stairs					Easy
746	Prefix and Suffix Search					Hard
745	Find Smallest Letter Greater Than Target					Easy
744	Network Delay Time					Medium
743	Closest Leaf in a Binary Tree 📘					Medium
741	Cherry Pickup					Hard
740	Delete and Earn					Medium
739	Daily Temperatures					Medium
738	Monotone Increasing Digits					Medium
737	Sentence Similarity II 📘					Medium
736	Parse Lisp Expression					Hard
735	Asteroid Collision					Medium
734	Sentence Similarity 📘					Easy
733	Flood Fill					Easy
732	My Calendar III					Hard
731	My Calendar II					Medium
730	Count Different Palindromic Subsequences					Hard
729	My Calendar I					Medium
728	Self Dividing Numbers					Easy
727	Minimum Window Subsequence 📘					Hard
726	Number of Atoms					Hard
725	Split Linked List in Parts					Medium
724	Find Pivot Index					Easy
723	Candy Crush 📘					Medium
722	Remove Comments					Medium
721	Accounts Merge					Medium
720	Longest Word in Dictionary					Easy
719	Find K-th Smallest Pair Distance					Hard
718	Maximum Length of Repeated Subarray					Medium
717	1-bit and 2-bit Characters					Easy
716	Max Stack 📘					Hard
715	Range Module					Hard
714	Best Time to Buy and Sell Stock with Transaction Fee					Medium
713	Subarray Product Less Than K					Medium
712	Minimum ASCII Delete Sum for Two Strings					Medium
711	Number of Distinct Islands II 📘					Hard
699	Falling Squares					Hard
698	Partition to K Equal Sum Subsets					Medium
697	Degree of an Array					Easy
696	Count Binary Substrings					Easy
695	Max Area of Island					Easy
694	Number of Distinct Islands 📘					Medium
693	Binary Number with Alternating Bits					Easy
692	Top K Frequent Words					Medium
691	Stickers to Spell Word					Hard
690	Employee Importance					Easy
689	Maximum Sum of 3 Non-Overlapping Subarrays					Hard
688	Knight Probability in Chessboard					Medium
687	Longest Univalue Path					Easy
686	Repeated String Match					Easy
685	Redundant Connection II					Hard
684	Redundant Connection					Medium
683	K Empty Slots 📘					Hard
682	Baseball Game					Easy
681	Next Closest Time 📘					Medium
680	Valid Palindrome II					Easy
679	24 Game					Hard
678	Valid Parenthesis String					Medium
677	Map Sum Pairs					Medium
676	Implement Magic Dictionary					Medium
675	Cut Off Trees for Golf Event					Hard
674	Longest Continuous Increasing Subsequence					Easy
673	Number of Longest Increasing Subsequence					Medium
672	Bulb Switcher II					Medium
671	Second Minimum Node In a Binary Tree					Easy
670	Maximum Swap					Medium
669	Trim a Binary Search Tree					Easy
668	Kth Smallest Number in Multiplication Table					Hard
667	Beautiful Arrangement II					Medium
666	Path Sum IV 📘					Medium
665	Non-decreasing Array					Easy
664	Strange Printer					Hard
663	Equal Tree Partition 📘					Medium
662	Maximum Width of Binary Tree					Medium
661	Image Smoother					Easy
660	Remove 9 📘					Hard
659	Split Array into Consecutive Subsequences					Medium
658	Find K Closest Elements					Medium
657	Judge Route Circle					Easy
656	Coin Path 📘					Hard
655	Print Binary Tree					Medium
654	Maximum Binary Tree					Medium
653	Two Sum IV - Input is a BST					Easy
652	Find Duplicate Subtrees					Medium
651	4 Keys Keyboard 📘					Medium
650	2 Keys Keyboard					Medium
649	Dota2 Senate					Medium
648	Replace Words					Medium
647	Palindromic Substrings					Medium
646	Maximum Length of Pair Chain					Medium
645	Set Mismatch					Easy
644	Maximum Average Subarray II 📘					Hard
643	Maximum Average Subarray I					Easy
642	Design Search Autocomplete System 📘					Hard
640	Solve the Equation					Medium
639	Decode Ways II					Hard
638	Shopping Offers					Medium
637	Average of Levels in Binary Tree					Easy
636	Exclusive Time of Functions					Medium
635	Design Log Storage System 📘					Medium
634	Find the Derangement of An Array 📘					Medium
633	Sum of Square Numbers					Easy
632	Smallest Range					Hard
631	Design Excel Sum Formula 📘					Hard
630	Course Schedule III					Hard
629	K Inverse Pairs Array					Hard
628	Maximum Product of Three Numbers					Easy
625	Minimum Factorization 📘					Medium
624	Maximum Distance in Arrays 📘					Easy
623	Add One Row to Tree					Medium
621	Task Scheduler					Medium
617	Merge Two Binary Trees					Easy
616	Add Bold Tag in String 📘					Medium
611	Valid Triangle Number					Medium
609	Find Duplicate File in System					Medium
606	Construct String from Binary Tree					Easy
605	Can Place Flowers					Easy
604	Design Compressed String Iterator 📘					Easy
600	Non-negative Integers without Consecutive Ones					Hard
599	Minimum Index Sum of Two Lists					Easy
598	Range Addition II					Easy
594	Longest Harmonious Subsequence					Easy
593	Valid Square					Medium
592	Fraction Addition and Subtraction					Medium
591	Tag Validator					Hard
588	Design In-Memory File System 📘					Hard
587	Erect the Fence					Hard
583	Delete Operation for Two Strings					Medium
582	Kill Process 📘					Medium
581	Shortest Unsorted Continuous Subarray					Easy
576	Out of Boundary Paths					Medium
575	Distribute Candies					Easy
573	Squirrel Simulation 📘					Medium
572	Subtree of Another Tree					Easy
568	Maximum Vacation Days 📘					Hard
567	Permutation in String					Medium
566	Reshape the Matrix					Easy
565	Array Nesting					Medium
564	Find the Closest Palindrome					Hard
563	Binary Tree Tilt					Easy
562	Longest Line of Consecutive One in Matrix 📘					Medium
561	Array Partition I					Easy
560	Subarray Sum Equals K					Medium
557	Reverse Words in a String III					Easy
556	Next Greater Element III					Medium
555	Split Concatenated Strings 📘					Medium
554	Brick Wall					Medium
553	Optimal Division					Medium
552	Student Attendance Record II					Hard
551	Student Attendance Record I					Easy
549	Binary Tree Longest Consecutive Sequence II 📘					Medium
548	Split Array with Equal Sum 📘					Medium
547	Friend Circles					Medium
546	Remove Boxes					Hard
545	Boundary of Binary Tree 📘					Medium
544	Output Contest Matches 📘					Medium
543	Diameter of Binary Tree					Easy
542	01 Matrix					Medium
541	Reverse String II					Easy
540	Single Element in a Sorted Array					Medium
539	Minimum Time Difference					Medium
538	Convert BST to Greater Tree					Easy
537	Complex Number Multiplication					Medium
536	Construct Binary Tree from String 📘					Medium
535	Encode and Decode TinyURL					Medium
533	Lonely Pixel II 📘					Medium
532	K-diff Pairs in an Array					Easy
531	Lonely Pixel I 📘					Medium
530	Minimum Absolute Difference in BST					Easy
529	Minesweeper					Medium
527	Word Abbreviation 📘					Hard
526	Beautiful Arrangement					Medium
525	Contiguous Array					Medium
524	Longest Word in Dictionary through Deleting					Medium
523	Continuous Subarray Sum					Medium
522	Longest Uncommon Subsequence II					Medium
521	Longest Uncommon Subsequence I					Easy
520	Detect Capital					Easy
517	Super Washing Machines					Hard
516	Longest Palindromic Subsequence					Medium
515	Find Largest Value in Each Tree Row					Medium
514	Freedom Trail					Hard
513	Find Bottom Left Tree Value					Medium
508	Most Frequent Subtree Sum					Medium
507	Perfect Number					Easy
506	Relative Ranks					Easy
505	The Maze II 📘					Medium
504	Base 7					Easy
503	Next Greater Element II					Medium
502	IPO					Hard
501	Find Mode in Binary Search Tree					Easy
500	Keyboard Row					Easy
499	The Maze III 📘					Hard
498	Diagonal Traverse					Medium
496	Next Greater Element I					Easy
495	Teemo Attacking					Medium
494	Target Sum					Medium
493	Reverse Pairs					Hard
492	Construct the Rectangle					Easy
491	Increasing Subsequences					Medium
490	The Maze 📘					Medium
488	Zuma Game					Hard
487	Max Consecutive Ones II 📘					Medium
486	Predict the Winner					Medium
485	Max Consecutive Ones					Easy
484	Find Permutation 📘					Medium
483	Smallest Good Base					Hard
482	License Key Formatting					Easy
481	Magical String					Medium
480	Sliding Window Median					Hard
479	Largest Palindrome Product					Easy
477	Total Hamming Distance					Medium
476	Number Complement					Easy
475	Heaters					Easy
474	Ones and Zeroes					Medium
473	Matchsticks to Square					Medium
472	Concatenated Words					Hard
471	Encode String with Shortest Length 📘					Hard
469	Convex Polygon 📘					Medium
468	Validate IP Address					Medium
467	Unique Substrings in Wraparound String					Medium
466	Count The Repetitions					Hard
465	Optimal Account Balancing 📘					Hard
464	Can I Win					Medium
463	Island Perimeter					Easy
462	Minimum Moves to Equal Array Elements II					Medium
461	Hamming Distance					Easy
460	LFU Cache					Hard
459	Repeated Substring Pattern					Easy
456	132 Pattern					Medium
455	Assign Cookies					Easy
454	4Sum II					Medium
453	Minimum Moves to Equal Array Elements					Easy
452	Minimum Number of Arrows to Burst Balloons					Medium
451	Sort Characters By Frequency					Medium
450	Delete Node in a BST					Medium
449	Serialize and Deserialize BST					Medium
448	Find All Numbers Disappeared in an Array					Easy
447	Number of Boomerangs					Easy
446	Arithmetic Slices II - Subsequence					Hard
445	Add Two Numbers II					Medium
444	Sequence Reconstruction 📘					Medium
443	String Compression					Easy
442	Find All Duplicates in an Array					Medium
441	Arranging Coins					Easy
440	K-th Smallest in Lexicographical Order					Hard
439	Ternary Expression Parser 📘					Medium
438	Find All Anagrams in a String					Easy
437	Path Sum III					Easy
436	Find Right Interval					Medium
435	Non-overlapping Intervals					Medium
434	Number of Segments in a String					Easy
432	All O`one Data Structure					Hard
425	Word Squares 📘					Hard
424	Longest Repeating Character Replacement					Medium
423	Reconstruct Original Digits from English					Medium
422	Valid Word Square 📘					Easy
421	Maximum XOR of Two Numbers in an Array					Medium
420	Strong Password Checker					Hard
419	Battleships in a Board					Medium
418	Sentence Screen Fitting 📘					Medium
417	Pacific Atlantic Water Flow					Medium
416	Partition Equal Subset Sum					Medium
415	Add Strings					Easy
414	Third Maximum Number					Easy
413	Arithmetic Slices					Medium
412	Fizz Buzz					Easy
411	Minimum Unique Word Abbreviation 📘					Hard
410	Split Array Largest Sum					Hard
409	Longest Palindrome					Easy
408	Valid Word Abbreviation 📘					Easy
407	Trapping Rain Water II					Hard
406	Queue Reconstruction by Height					Medium
405	Convert a Number to Hexadecimal					Easy
404	Sum of Left Leaves					Easy
403	Frog Jump					Hard
402	Remove K Digits					Medium
401	Binary Watch					Easy
400	Nth Digit					Easy
399	Evaluate Division					Medium
398	Random Pick Index					Medium
397	Integer Replacement					Medium
396	Rotate Function					Medium
395	Longest Substring with At Least K Repeating Characters					Medium
394	Decode String					Medium
393	UTF-8 Validation					Medium
392	Is Subsequence					Medium
391	Perfect Rectangle					Hard
390	Elimination Game					Medium
389	Find the Difference					Easy
388	Longest Absolute File Path					Medium
387	First Unique Character in a String					Easy
386	Lexicographical Numbers					Medium
385	Mini Parser					Medium
384	Shuffle an Array					Medium
383	Ransom Note					Easy
382	Linked List Random Node					Medium
381	Insert Delete GetRandom O(1) - Duplicates allowed					Hard
380	Insert Delete GetRandom O(1)					Medium
379	Design Phone Directory 📘					Medium
378	Kth Smallest Element in a Sorted Matrix					Medium
377	Combination Sum IV					Medium
376	Wiggle Subsequence					Medium
375	Guess Number Higher or Lower II					Medium
374	Guess Number Higher or Lower					Easy
373	Find K Pairs with Smallest Sums					Medium
372	Super Pow					Medium
371	Sum of Two Integers					Easy
370	Range Addition 📘					Medium
369	Plus One Linked List 📘					Medium
368	Largest Divisible Subset					Medium
367	Valid Perfect Square					Easy
366	Find Leaves of Binary Tree 📘					Medium
365	Water and Jug Problem					Medium
364	Nested List Weight Sum II 📘					Medium
363	Max Sum of Rectangle No Larger Than K					Hard
362	Design Hit Counter 📘					Medium
361	Bomb Enemy 📘					Medium
360	Sort Transformed Array 📘					Medium
359	Logger Rate Limiter 📘					Easy
358	Rearrange String k Distance Apart 📘					Hard
357	Count Numbers with Unique Digits					Medium
356	Line Reflection 📘					Medium
355	Design Twitter					Medium
354	Russian Doll Envelopes					Hard
353	Design Snake Game 📘					Medium
352	Data Stream as Disjoint Intervals					Hard
351	Android Unlock Patterns 📘					Medium
350	Intersection of Two Arrays II					Easy
349	Intersection of Two Arrays					Easy
348	Design Tic-Tac-Toe 📘					Medium
347	Top K Frequent Elements					Medium
346	Moving Average from Data Stream 📘					Easy
345	Reverse Vowels of a String					Easy
344	Reverse String					Easy
343	Integer Break					Medium
342	Power of Four					Easy
341	Flatten Nested List Iterator					Medium
340	Longest Substring with At Most K Distinct Characters 📘					Hard
339	Nested List Weight Sum 📘					Easy
338	Counting Bits					Medium
337	House Robber III					Medium
336	Palindrome Pairs					Hard
335	Self Crossing					Hard
334	Increasing Triplet Subsequence					Medium
333	Largest BST Subtree 📘					Medium
332	Reconstruct Itinerary					Medium
331	Verify Preorder Serialization of a Binary Tree					Medium
330	Patching Array					Hard
329	Longest Increasing Path in a Matrix					Hard
328	Odd Even Linked List					Medium
327	Count of Range Sum					Hard
326	Power of Three					Easy
325	Maximum Size Subarray Sum Equals k 📘					Medium
324	Wiggle Sort II					Medium
323	Number of Connected Components in an Undirected Graph 📘					Medium
322	Coin Change					Medium
321	Create Maximum Number					Hard
320	Generalized Abbreviation 📘					Medium
319	Bulb Switcher					Medium
318	Maximum Product of Word Lengths					Medium
317	Shortest Distance from All Buildings 📘					Hard
316	Remove Duplicate Letters					Hard
315	Count of Smaller Numbers After Self					Hard
314	Binary Tree Vertical Order Traversal 📘					Medium
313	Super Ugly Number					Medium
312	Burst Balloons					Hard
311	Sparse Matrix Multiplication 📘					Medium
310	Minimum Height Trees					Medium
309	Best Time to Buy and Sell Stock with Cooldown					Medium
308	Range Sum Query 2D - Mutable 📘					Hard
307	Range Sum Query - Mutable					Medium
306	Additive Number					Medium
305	Number of Islands II 📘					Hard
304	Range Sum Query 2D - Immutable					Medium
303	Range Sum Query - Immutable					Easy
302	Smallest Rectangle Enclosing Black Pixels 📘					Hard
301	Remove Invalid Parentheses					Hard
300	Longest Increasing Subsequence					Medium
299	Bulls and Cows					Medium
298	Binary Tree Longest Consecutive Sequence 📘					Medium
297	Serialize and Deserialize Binary Tree					Hard
296	Best Meeting Point 📘					Hard
295	Find Median from Data Stream					Hard
294	Flip Game II 📘					Medium
293	Flip Game 📘					Easy
292	Nim Game					Easy
291	Word Pattern II 📘					Hard
290	Word Pattern					Easy
289	Game of Life					Medium
288	Unique Word Abbreviation 📘					Medium
287	Find the Duplicate Number					Medium
286	Walls and Gates 📘					Medium
285	Inorder Successor in BST 📘					Medium
284	Peeking Iterator					Medium
283	Move Zeroes					Easy
282	Expression Add Operators					Hard
281	Zigzag Iterator 📘					Medium
280	Wiggle Sort 📘					Medium
279	Perfect Squares					Medium
278	First Bad Version					Easy
277	Find the Celebrity 📘					Medium
276	Paint Fence 📘					Easy
275	H-Index II					Medium
274	H-Index					Medium
273	Integer to English Words					Hard
272	Closest Binary Search Tree Value II 📘					Hard
271	Encode and Decode Strings 📘					Medium
270	Closest Binary Search Tree Value 📘					Easy
269	Alien Dictionary 📘					Hard
268	Missing Number					Easy
267	Palindrome Permutation II 📘					Medium
266	Palindrome Permutation 📘					Easy
265	Paint House II 📘					Hard
264	Ugly Number II					Medium
263	Ugly Number					Easy
261	Graph Valid Tree 📘					Medium
260	Single Number III					Medium
259	3Sum Smaller 📘					Medium
258	Add Digits					Easy
257	Binary Tree Paths					Easy
256	Paint House 📘					Easy
255	Verify Preorder Sequence in Binary Search Tree 📘					Medium
254	Factor Combinations 📘					Medium
253	Meeting Rooms II 📘					Medium
252	Meeting Rooms 📘					Easy
251	Flatten 2D Vector 📘					Medium
250	Count Univalue Subtrees 📘					Medium
249	Group Shifted Strings 📘					Medium
248	Strobogrammatic Number III 📘					Hard
247	Strobogrammatic Number II 📘					Medium
246	Strobogrammatic Number 📘					Easy
245	Shortest Word Distance III 📘					Medium
244	Shortest Word Distance II 📘					Medium
243	Shortest Word Distance 📘					Easy
242	Valid Anagram					Easy
241	Different Ways to Add Parentheses					Medium
240	Search a 2D Matrix II					Medium
239	Sliding Window Maximum					Hard
238	Product of Array Except Self					Medium
237	Delete Node in a Linked List					Easy
236	Lowest Common Ancestor of a Binary Tree					Medium
235	Lowest Common Ancestor of a Binary Search Tree					Easy
234	Palindrome Linked List					Easy
233	Number of Digit One					Hard
232	Implement Queue using Stacks					Easy
231	Power of Two					Easy
230	Kth Smallest Element in a BST					Medium
229	Majority Element II					Medium
228	Summary Ranges					Medium
227	Basic Calculator II					Medium
226	Invert Binary Tree					Easy
225	Implement Stack using Queues					Easy
224	Basic Calculator					Hard
223	Rectangle Area					Medium
222	Count Complete Tree Nodes					Medium
221	Maximal Square					Medium
220	Contains Duplicate III					Medium
219	Contains Duplicate II					Easy
218	The Skyline Problem					Hard
217	Contains Duplicate					Easy
216	Combination Sum III					Medium
215	Kth Largest Element in an Array					Medium
214	Shortest Palindrome					Hard
213	House Robber II					Medium
212	Word Search II					Hard
211	Add and Search Word - Data structure design					Medium
210	Course Schedule II					Medium
209	Minimum Size Subarray Sum					Medium
208	Implement Trie (Prefix Tree)					Medium
207	Course Schedule					Medium
206	Reverse Linked List					Easy
205	Isomorphic Strings					Easy
204	Count Primes					Easy
203	Remove Linked List Elements					Easy
202	Happy Number					Easy
201	Bitwise AND of Numbers Range					Medium
200	Number of Islands					Medium
199	Binary Tree Right Side View					Medium
198	House Robber					Easy
191	Number of 1 Bits					Easy
190	Reverse Bits					Easy
189	Rotate Array					Easy
188	Best Time to Buy and Sell Stock IV					Hard
187	Repeated DNA Sequences					Medium
186	Reverse Words in a String II 📘					Medium
179	Largest Number					Medium
174	Dungeon Game					Hard
173	Binary Search Tree Iterator					Medium
172	Factorial Trailing Zeroes					Easy
171	Excel Sheet Column Number					Easy
170	Two Sum III - Data structure design 📘					Easy
169	Majority Element					Easy
168	Excel Sheet Column Title					Easy
167	Two Sum II - Input array is sorted					Easy
166	Fraction to Recurring Decimal					Medium
165	Compare Version Numbers					Medium
164	Maximum Gap					Hard
163	Missing Ranges 📘					Medium
162	Find Peak Element					Medium
161	One Edit Distance 📘					Medium
160	Intersection of Two Linked Lists					Easy
159	Longest Substring with At Most Two Distinct Characters 📘					Hard
158	Read N Characters Given Read4 II - Call multiple times 📘					Hard
157	Read N Characters Given Read4 📘					Easy
156	Binary Tree Upside Down 📘					Medium
155	Min Stack					Easy
154	Find Minimum in Rotated Sorted Array II					Hard
153	Find Minimum in Rotated Sorted Array					Medium
152	Maximum Product Subarray					Medium
151	Reverse Words in a String					Medium
150	Evaluate Reverse Polish Notation					Medium
149	Max Points on a Line					Hard
148	Sort List					Medium
147	Insertion Sort List					Medium
146	LRU Cache					Hard
145	Binary Tree Postorder Traversal					Hard
144	Binary Tree Preorder Traversal					Medium
143	Reorder List					Medium
142	Linked List Cycle II					Medium
141	Linked List Cycle					Easy
140	Word Break II					Hard
139	Word Break					Medium
138	Copy List with Random Pointer					Medium
137	Single Number II					Medium
136	Single Number					Easy
135	Candy					Hard
134	Gas Station					Medium
133	Clone Graph					Medium
132	Palindrome Partitioning II					Hard
131	Palindrome Partitioning					Medium
130	Surrounded Regions					Medium
129	Sum Root to Leaf Numbers					Medium
128	Longest Consecutive Sequence					Hard
127	Word Ladder					Medium
126	Word Ladder II					Hard
125	Valid Palindrome					Easy
124	Binary Tree Maximum Path Sum					Hard
123	Best Time to Buy and Sell Stock III					Hard
122	Best Time to Buy and Sell Stock II					Easy
121	Best Time to Buy and Sell Stock					Easy
120	Triangle					Medium
119	Pascal's Triangle II					Easy
118	Pascal's Triangle					Easy
117	Populating Next Right Pointers in Each Node II					Medium
116	Populating Next Right Pointers in Each Node					Medium
115	Distinct Subsequences					Hard
114	Flatten Binary Tree to Linked List					Medium
113	Path Sum II					Medium
112	Path Sum					Easy
111	Minimum Depth of Binary Tree					Easy
110	Balanced Binary Tree					Easy
109	Convert Sorted List to Binary Search Tree					Medium
108	Convert Sorted Array to Binary Search Tree					Easy
107	Binary Tree Level Order Traversal II					Easy
106	Construct Binary Tree from Inorder and Postorder Traversal					Medium
105	Construct Binary Tree from Preorder and Inorder Traversal					Medium
104	Maximum Depth of Binary Tree					Easy
103	Binary Tree Zigzag Level Order Traversal					Medium
102	Binary Tree Level Order Traversal					Medium
101	Symmetric Tree					Easy
100	Same Tree					Easy
99	Recover Binary Search Tree					Hard
98	Validate Binary Search Tree					Medium
97	Interleaving String					Hard
96	Unique Binary Search Trees					Medium
95	Unique Binary Search Trees II					Medium
94	Binary Tree Inorder Traversal					Medium
93	Restore IP Addresses					Medium
92	Reverse Linked List II					Medium
91	Decode Ways					Medium
90	Subsets II					Medium
89	Gray Code					Medium
88	Merge Sorted Array					Easy
87	Scramble String					Hard
86	Partition List					Medium
85	Maximal Rectangle					Hard
84	Largest Rectangle in Histogram					Hard
83	Remove Duplicates from Sorted List					Easy
82	Remove Duplicates from Sorted List II					Medium
81	Search in Rotated Sorted Array II					Medium
80	Remove Duplicates from Sorted Array II					Medium
79	Word Search					Medium
78	Subsets					Medium
77	Combinations					Medium
76	Minimum Window Substring					Hard
75	Sort Colors					Medium
74	Search a 2D Matrix					Medium
73	Set Matrix Zeroes					Medium
72	Edit Distance					Hard
71	Simplify Path					Medium
70	Climbing Stairs					Easy
69	Sqrt(x)					Easy
68	Text Justification					Hard
67	Add Binary					Easy
66	Plus One					Easy
65	Valid Number					Hard
64	Minimum Path Sum					Medium
63	Unique Paths II					Medium
62	Unique Paths					Medium
61	Rotate List					Medium
60	Permutation Sequence					Medium
59	Spiral Matrix II					Medium
58	Length of Last Word					Easy
57	Insert Interval					Hard
56	Merge Intervals					Medium
55	Jump Game					Medium
54	Spiral Matrix					Medium
53	Maximum Subarray					Easy
52	N-Queens II					Hard
51	N-Queens					Hard
50	Pow(x, n)					Medium
49	Group Anagrams					Medium
48	Rotate Image					Medium
47	Permutations II					Medium
46	Permutations					Medium
45	Jump Game II					Hard
44	Wildcard Matching					Hard
43	Multiply Strings					Medium
42	Trapping Rain Water					Hard
41	First Missing Positive					Hard
40	Combination Sum II					Medium
39	Combination Sum					Medium
38	Count and Say					Easy
37	Sudoku Solver					Hard
36	Valid Sudoku					Medium
35	Search Insert Position					Easy
34	Search for a Range					Medium
33	Search in Rotated Sorted Array					Medium
32	Longest Valid Parentheses					Hard
31	Next Permutation					Medium
30	Substring with Concatenation of All Words					Hard
29	Divide Two Integers					Medium
28	Implement strStr()					Easy
27	Remove Element					Easy
26	Remove Duplicates from Sorted Array					Easy
25	Reverse Nodes in k-Group					Hard
24	Swap Nodes in Pairs					Medium
23	Merge k Sorted Lists					Hard
22	Generate Parentheses					Medium
21	Merge Two Sorted Lists					Easy
20	Valid Parentheses					Easy
19	Remove Nth Node From End of List					Medium
18	4Sum					Medium
17	Letter Combinations of a Phone Number					Medium
16	3Sum Closest					Medium
15	3Sum					Medium
14	Longest Common Prefix					Easy
13	Roman to Integer					Easy
12	Integer to Roman					Medium
11	Container With Most Water					Medium
10	Regular Expression Matching					Hard
9	Palindrome Number					Easy
8	String to Integer (atoi)					Medium
7	Reverse Integer					Easy
6	ZigZag Conversion					Medium
5	Longest Palindromic Substring		Solution.java	Solution.js	Solution.py	Medium
4	Median of Two Sorted Arrays		Solution.java	Solution.js	Solution.py	Hard
3	Longest Substring Without Repeating Characters		Solution.java	Solution.js	Solution.py	Medium
2	Add Two Numbers		Solution.java	Solution.js	Solution.py	Medium
1	Two Sum		Solution.java	Solution.js	Solution.py	Easy