Leetcode Solutions with JavaScript

Update time: Sat Jul 29 2017 11:54:31 GMT+0800 (CST)

I have solved 344 / 573 problems while 107 problems are still locked.

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

#	Title	Source Code	Explanation	Difficulty
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	JavaScript / Python		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	Python		Medium
546	Remove Boxes			Hard
545	Boundary of Binary Tree 📘			Medium
544	Output Contest Matches 📘			Medium
543	Diameter of Binary Tree	Python		Easy
542	01 Matrix	JavaScript		Medium
541	Reverse String II	Python		Easy
540	Single Element in a Sorted Array			Medium
539	Minimum Time Difference	JavaScript		Medium
538	Convert BST to Greater Tree	Python		Easy
537	Complex Number Multiplication	Python		Medium
536	Construct Binary Tree from String 📘			Medium
535	Encode and Decode TinyURL	JavaScript		Medium
533	Lonely Pixel II 📘	Python		Medium
532	K-diff Pairs in an Array	Python		Easy
531	Lonely Pixel I 📘	Python		Medium
530	Minimum Absolute Difference in BST	Python		Easy
529	Minesweeper	Python		Medium
527	Word Abbreviation 📘			Hard
526	Beautiful Arrangement	JavaScript		Medium
525	Contiguous Array			Medium
524	Longest Word in Dictionary through Deleting			Medium
523	Continuous Subarray Sum	Python	Explanation	Medium
522	Longest Uncommon Subsequence II			Medium
521	Longest Uncommon Subsequence I	Python		Easy
520	Detect Capital	JavaScript		Easy
517	Super Washing Machines			Hard
516	Longest Palindromic Subsequence			Medium
515	Find Largest Value in Each Tree Row	JavaScript		Medium
514	Freedom Trail			Hard
513	Find Bottom Left Tree Value	JavaScript		Medium
508	Most Frequent Subtree Sum	JavaScript		Medium
507	Perfect Number	Python		Easy
506	Relative Ranks	JavaScript		Easy
505	The Maze II 📘			Medium
504	Base 7	JavaScript		Easy
503	Next Greater Element II	JavaScript		Medium
502	IPO	JavaScript		Hard
501	Find Mode in Binary Search Tree	JavaScript		Easy
500	Keyboard Row	JavaScript		Easy
499	The Maze III 📘			Hard
498	Diagonal Traverse	JavaScript		Medium
496	Next Greater Element I	JavaScript		Easy
495	Teemo Attacking	JavaScript		Medium
494	Target Sum	JavaScript	Explanation	Medium
493	Reverse Pairs			Hard
492	Construct the Rectangle	JavaScript		Easy
491	Increasing Subsequences	JavaScript		Medium
490	The Maze 📘			Medium
488	Zuma Game			Hard
487	Max Consecutive Ones II 📘			Medium
486	Predict the Winner	JavaScript	Explanation	Medium
485	Max Consecutive Ones	JavaScript		Easy
484	Find Permutation 📘			Medium
483	Smallest Good Base			Hard
482	License Key Formatting	JavaScript		Medium
481	Magical String	JavaScript		Medium
480	Sliding Window Median	JavaScript		Hard
479	Largest Palindrome Product			Easy
477	Total Hamming Distance	JavaScript		Medium
476	Number Complement	JavaScript		Easy
475	Heaters	JavaScript		Easy
474	Ones and Zeroes	JavaScript		Medium
473	Matchsticks to Square	JavaScript	Explanation	Medium
472	Concatenated Words			Hard
471	Encode String with Shortest Length 📘			Hard
469	Convex Polygon 📘			Medium
468	Validate IP Address	JavaScript		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	JavaScript		Easy
462	Minimum Moves to Equal Array Elements II	JavaScript	Explanation	Medium
461	Hamming Distance	JavaScript		Easy
460	LFU Cache			Hard
459	Repeated Substring Pattern	JavaScript		Easy
456	132 Pattern			Medium
455	Assign Cookies	JavaScript		Easy
454	4Sum II	JavaScript		Medium
453	Minimum Moves to Equal Array Elements	JavaScript	Explanation	Easy
452	Minimum Number of Arrows to Burst Balloons	JavaScript		Medium
451	Sort Characters By Frequency	JavaScript		Medium
450	Delete Node in a BST			Medium
449	Serialize and Deserialize BST			Medium
448	Find All Numbers Disappeared in an Array	JavaScript		Easy
447	Number of Boomerangs	JavaScript		Easy
446	Arithmetic Slices II - Subsequence			Hard
445	Add Two Numbers II	JavaScript		Medium
444	Sequence Reconstruction 📘			Medium
442	Find All Duplicates in an Array	JavaScript		Medium
441	Arranging Coins	JavaScript		Easy
440	K-th Smallest in Lexicographical Order			Hard
439	Ternary Expression Parser 📘			Medium
438	Find All Anagrams in a String	JavaScript	Explanation	Easy
437	Path Sum III	JavaScript	Explanation	Easy
436	Find Right Interval	JavaScript		Medium
435	Non-overlapping Intervals	JavaScript		Medium
434	Number of Segments in a String	JavaScript		Easy
432	All O`one Data Structure			Hard
425	Word Squares 📘			Hard
424	Longest Repeating Character Replacement			Medium
423	Reconstruct Original Digits from English	JavaScript		Medium
422	Valid Word Square 📘			Easy
421	Maximum XOR of Two Numbers in an Array	JavaScript	Explanation	Medium
420	Strong Password Checker			Hard
419	Battleships in a Board	JavaScript		Medium
418	Sentence Screen Fitting 📘			Medium
417	Pacific Atlantic Water Flow	JavaScript		Medium
416	Partition Equal Subset Sum			Medium
415	Add Strings	JavaScript		Easy
414	Third Maximum Number	JavaScript		Easy
413	Arithmetic Slices	JavaScript		Medium
412	Fizz Buzz	JavaScript		Easy
411	Minimum Unique Word Abbreviation 📘			Hard
410	Split Array Largest Sum			Hard
409	Longest Palindrome	JavaScript		Easy
408	Valid Word Abbreviation 📘			Easy
407	Trapping Rain Water II			Hard
406	Queue Reconstruction by Height	JavaScript		Medium
405	Convert a Number to Hexadecimal	JavaScript		Easy
404	Sum of Left Leaves	JavaScript		Easy
403	Frog Jump			Hard
402	Remove K Digits	JavaScript	Explanation	Medium
401	Binary Watch	JavaScript		Easy
400	Nth Digit	JavaScript		Easy
399	Evaluate Division			Medium
398	Random Pick Index	Python		Medium
397	Integer Replacement	JavaScript		Medium
396	Rotate Function	JavaScript		Medium
395	Longest Substring with At Least K Repeating Characters	JavaScript	Explanation	Medium
394	Decode String	JavaScript		Medium
393	UTF-8 Validation	JavaScript		Medium
392	Is Subsequence	JavaScript		Medium
391	Perfect Rectangle			Hard
390	Elimination Game			Medium
389	Find the Difference	JavaScript		Easy
388	Longest Absolute File Path	JavaScript		Medium
387	First Unique Character in a String	JavaScript		Easy
386	Lexicographical Numbers	JavaScript		Medium
385	Mini Parser	JavaScript		Medium
384	Shuffle an Array	JavaScript		Medium
383	Ransom Note	JavaScript		Easy
382	Linked List Random Node	JavaScript		Medium
381	Insert Delete GetRandom O(1) - Duplicates allowed	Python		Hard
380	Insert Delete GetRandom O(1)	Python		Medium
379	Design Phone Directory 📘			Medium
378	Kth Smallest Element in a Sorted Matrix	JavaScript		Medium
377	Combination Sum IV	JavaScript		Medium
376	Wiggle Subsequence	JavaScript		Medium
375	Guess Number Higher or Lower II	JavaScript		Medium
374	Guess Number Higher or Lower	C++		Easy
373	Find K Pairs with Smallest Sums	JavaScript		Medium
372	Super Pow	JavaScript		Medium
371	Sum of Two Integers	JavaScript		Easy
370	Range Addition 📘			Medium
369	Plus One Linked List 📘			Medium
368	Largest Divisible Subset	JavaScript		Medium
367	Valid Perfect Square	JavaScript		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	JavaScript		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	JavaScript		Easy
349	Intersection of Two Arrays	JavaScript		Easy
348	Design Tic-Tac-Toe 📘			Medium
347	Top K Frequent Elements	JavaScript	Explanation	Medium
346	Moving Average from Data Stream 📘			Easy
345	Reverse Vowels of a String	JavaScript	Explanation	Easy
344	Reverse String	JavaScript	Explanation	Easy
343	Integer Break	JavaScript	Explanation	Medium
342	Power of Four	JavaScript	Explanation	Easy
341	Flatten Nested List Iterator	JavaScript	Explanation	Medium
340	Longest Substring with At Most K Distinct Characters 📘			Hard
339	Nested List Weight Sum 📘			Easy
338	Counting Bits	JavaScript	Explanation	Medium
337	House Robber III	JavaScript	Explanation	Medium
336	Palindrome Pairs	JavaScript		Hard
335	Self Crossing	JavaScript	Explanation	Hard
334	Increasing Triplet Subsequence	JavaScript	Explanation	Medium
333	Largest BST Subtree 📘			Medium
332	Reconstruct Itinerary			Medium
331	Verify Preorder Serialization of a Binary Tree	JavaScript		Medium
330	Patching Array	JavaScript	Explanation	Hard
329	Longest Increasing Path in a Matrix			Hard
328	Odd Even Linked List	JavaScript		Medium
327	Count of Range Sum	JavaScript		Hard
326	Power of Three	JavaScript	Explanation	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	JavaScript	Explanation	Medium
321	Create Maximum Number			Hard
320	Generalized Abbreviation 📘			Medium
319	Bulb Switcher	JavaScript	Explanation	Medium
318	Maximum Product of Word Lengths	JavaScript		Medium
317	Shortest Distance from All Buildings 📘			Hard
316	Remove Duplicate Letters			Hard
315	Count of Smaller Numbers After Self	JavaScript	Explanation	Hard
314	Binary Tree Vertical Order Traversal 📘			Medium
313	Super Ugly Number	JavaScript	Explanation	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	JavaScript	Explanation	Medium
308	Range Sum Query 2D - Mutable 📘			Hard
307	Range Sum Query - Mutable	JavaScript	Explanation	Medium
306	Additive Number	JavaScript	Explanation	Medium
305	Number of Islands II 📘			Hard
304	Range Sum Query 2D - Immutable	JavaScript	Explanation	Medium
303	Range Sum Query - Immutable	JavaScript	Explanation	Easy
302	Smallest Rectangle Enclosing Black Pixels 📘			Hard
301	Remove Invalid Parentheses			Hard
300	Longest Increasing Subsequence	JavaScript	Explanation	Medium
299	Bulls and Cows	JavaScript	Explanation	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	JavaScript	Explanation	Hard
294	Flip Game II 📘			Medium
293	Flip Game 📘			Easy
292	Nim Game	JavaScript	Explanation	Easy
291	Word Pattern II 📘			Hard
290	Word Pattern	JavaScript	Explanation	Easy
289	Game of Life	JavaScript	Explanation	Medium
288	Unique Word Abbreviation 📘			Medium
287	Find the Duplicate Number	JavaScript	Explanation	Medium
286	Walls and Gates 📘			Medium
285	Inorder Successor in BST 📘			Medium
284	Peeking Iterator			Medium
283	Move Zeroes	JavaScript	Explanation	Easy
282	Expression Add Operators			Hard
281	Zigzag Iterator 📘			Medium
280	Wiggle Sort 📘			Medium
279	Perfect Squares	JavaScript	Explanation	Medium
278	First Bad Version	JavaScript	Explanation	Easy
277	Find the Celebrity 📘			Medium
276	Paint Fence 📘			Easy
275	H-Index II	JavaScript	Explanation	Medium
274	H-Index	JavaScript	Explanation	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	JavaScript	Explanation	Easy
267	Palindrome Permutation II 📘			Medium
266	Palindrome Permutation 📘			Easy
265	Paint House II 📘			Hard
264	Ugly Number II	JavaScript	Explanation	Medium
263	Ugly Number	JavaScript	Explanation	Easy
261	Graph Valid Tree 📘			Medium
260	Single Number III	JavaScript		Medium
259	3Sum Smaller 📘			Medium
258	Add Digits	JavaScript	Explanation	Easy
257	Binary Tree Paths	JavaScript	Explanation	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	JavaScript	Explanation	Easy
241	Different Ways to Add Parentheses	JavaScript	Explanation	Medium
240	Search a 2D Matrix II	JavaScript	Explanation	Medium
239	Sliding Window Maximum			Hard
238	Product of Array Except Self	JavaScript		Medium
237	Delete Node in a Linked List	JavaScript	Explanation	Easy
236	Lowest Common Ancestor of a Binary Tree	JavaScript	Explanation	Medium
235	Lowest Common Ancestor of a Binary Search Tree	JavaScript		Easy
234	Palindrome Linked List	JavaScript	Explanation	Easy
233	Number of Digit One	JavaScript		Hard
232	Implement Queue using Stacks	JavaScript	Explanation	Easy
231	Power of Two	JavaScript	Explanation	Easy
230	Kth Smallest Element in a BST	JavaScript	Explanation	Medium
229	Majority Element II	JavaScript		Medium
228	Summary Ranges	JavaScript	Explanation	Medium
227	Basic Calculator II	JavaScript		Medium
226	Invert Binary Tree	JavaScript	Explanation	Easy
225	Implement Stack using Queues	JavaScript	Explanation	Easy
224	Basic Calculator	JavaScript	Explanation	Hard
223	Rectangle Area	JavaScript	Explanation	Medium
222	Count Complete Tree Nodes	JavaScript	Explanation	Medium
221	Maximal Square	JavaScript		Medium
220	Contains Duplicate III	JavaScript		Medium
219	Contains Duplicate II	JavaScript		Easy
218	The Skyline Problem			Hard
217	Contains Duplicate	JavaScript		Easy
216	Combination Sum III	JavaScript		Medium
215	Kth Largest Element in an Array	JavaScript	Explanation	Medium
214	Shortest Palindrome	JavaScript	Explanation	Hard
213	House Robber II	JavaScript		Medium
212	Word Search II			Hard
211	Add and Search Word - Data structure design	JavaScript	Explanation	Medium
210	Course Schedule II	JavaScript		Medium
209	Minimum Size Subarray Sum	JavaScript		Medium
208	Implement Trie (Prefix Tree)	JavaScript		Medium
207	Course Schedule	JavaScript	Explanation	Medium
206	Reverse Linked List	JavaScript		Easy
205	Isomorphic Strings	JavaScript	Explanation	Easy
204	Count Primes	JavaScript	Explanation	Easy
203	Remove Linked List Elements	JavaScript	Explanation	Easy
202	Happy Number	JavaScript	Explanation	Easy
201	Bitwise AND of Numbers Range	JavaScript		Medium
200	Number of Islands	JavaScript	Explanation	Medium
199	Binary Tree Right Side View	JavaScript		Medium
198	House Robber	JavaScript		Easy
191	Number of 1 Bits	JavaScript		Easy
190	Reverse Bits	JavaScript	Explanation	Easy
189	Rotate Array	JavaScript	Explanation	Easy
188	Best Time to Buy and Sell Stock IV			Hard
187	Repeated DNA Sequences	JavaScript	Explanation	Medium
186	Reverse Words in a String II 📘			Medium
179	Largest Number	JavaScript	Explanation	Medium
174	Dungeon Game			Hard
173	Binary Search Tree Iterator			Medium
172	Factorial Trailing Zeroes	JavaScript	Explanation	Easy
171	Excel Sheet Column Number	JavaScript	Explanation	Easy
170	Two Sum III - Data structure design 📘			Easy
169	Majority Element	JavaScript	Explanation	Easy
168	Excel Sheet Column Title	JavaScript	Explanation	Easy
167	Two Sum II - Input array is sorted	JavaScript		Easy
166	Fraction to Recurring Decimal	JavaScript	Explanation	Medium
165	Compare Version Numbers	JavaScript	Explanation	Medium
164	Maximum Gap	JavaScript	Explanation	Hard
163	Missing Ranges 📘			Medium
162	Find Peak Element	JavaScript	Explanation	Medium
161	One Edit Distance 📘			Medium
160	Intersection of Two Linked Lists	JavaScript		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	JavaScript		Hard
153	Find Minimum in Rotated Sorted Array	JavaScript		Medium
152	Maximum Product Subarray	JavaScript		Medium
151	Reverse Words in a String	JavaScript	Explanation	Medium
150	Evaluate Reverse Polish Notation			Medium
149	Max Points on a Line			Hard
148	Sort List	JavaScript	Explanation	Medium
147	Insertion Sort List	JavaScript		Medium
146	LRU Cache	JavaScript	Explanation	Hard
145	Binary Tree Postorder Traversal	JavaScript		Hard
144	Binary Tree Preorder Traversal	JavaScript		Medium
143	Reorder List	JavaScript		Medium
142	Linked List Cycle II	JavaScript		Medium
141	Linked List Cycle	JavaScript	Explanation	Easy
140	Word Break II			Hard
139	Word Break	JavaScript		Medium
138	Copy List with Random Pointer	JavaScript		Medium
137	Single Number II	JavaScript		Medium
136	Single Number	JavaScript		Easy
135	Candy			Hard
134	Gas Station			Medium
133	Clone Graph	JavaScript		Medium
132	Palindrome Partitioning II	JavaScript	Explanation	Hard
131	Palindrome Partitioning	JavaScript	Explanation	Medium
130	Surrounded Regions			Medium
129	Sum Root to Leaf Numbers	JavaScript		Medium
128	Longest Consecutive Sequence	JavaScript		Hard
127	Word Ladder			Medium
126	Word Ladder II			Hard
125	Valid Palindrome	JavaScript	Explanation	Easy
124	Binary Tree Maximum Path Sum			Hard
123	Best Time to Buy and Sell Stock III	JavaScript		Hard
122	Best Time to Buy and Sell Stock II	JavaScript	Explanation	Easy
121	Best Time to Buy and Sell Stock	JavaScript	Explanation	Easy
120	Triangle	JavaScript		Medium
119	Pascal's Triangle II	JavaScript	Explanation	Easy
118	Pascal's Triangle	JavaScript	Explanation	Easy
117	Populating Next Right Pointers in Each Node II	JavaScript		Medium
116	Populating Next Right Pointers in Each Node	JavaScript		Medium
115	Distinct Subsequences			Hard
114	Flatten Binary Tree to Linked List	JavaScript	Explanation	Medium
113	Path Sum II	JavaScript		Medium
112	Path Sum	JavaScript		Easy
111	Minimum Depth of Binary Tree	JavaScript		Easy
110	Balanced Binary Tree	JavaScript		Easy
109	Convert Sorted List to Binary Search Tree	JavaScript		Medium
108	Convert Sorted Array to Binary Search Tree	JavaScript		Easy
107	Binary Tree Level Order Traversal II	JavaScript		Easy
106	Construct Binary Tree from Inorder and Postorder Traversal	JavaScript		Medium
105	Construct Binary Tree from Preorder and Inorder Traversal	JavaScript		Medium
104	Maximum Depth of Binary Tree	JavaScript		Easy
103	Binary Tree Zigzag Level Order Traversal	JavaScript		Medium
102	Binary Tree Level Order Traversal	JavaScript		Medium
101	Symmetric Tree	JavaScript		Easy
100	Same Tree	JavaScript		Easy
99	Recover Binary Search Tree			Hard
98	Validate Binary Search Tree	JavaScript		Medium
97	Interleaving String			Hard
96	Unique Binary Search Trees	JavaScript		Medium
95	Unique Binary Search Trees II	JavaScript		Medium
94	Binary Tree Inorder Traversal	JavaScript		Medium
93	Restore IP Addresses	JavaScript		Medium
92	Reverse Linked List II	JavaScript		Medium
91	Decode Ways	JavaScript		Medium
90	Subsets II	JavaScript		Medium
89	Gray Code	JavaScript		Medium
88	Merge Sorted Array	JavaScript	Explanation	Easy
87	Scramble String			Hard
86	Partition List	JavaScript	Explanation	Medium
85	Maximal Rectangle	JavaScript		Hard
84	Largest Rectangle in Histogram	JavaScript		Hard
83	Remove Duplicates from Sorted List	JavaScript		Easy
82	Remove Duplicates from Sorted List II	JavaScript		Medium
81	Search in Rotated Sorted Array II	JavaScript		Medium
80	Remove Duplicates from Sorted Array II	JavaScript	Explanation	Medium
79	Word Search	JavaScript		Medium
78	Subsets	JavaScript		Medium
77	Combinations	JavaScript		Medium
76	Minimum Window Substring			Hard
75	Sort Colors	JavaScript	Explanation	Medium
74	Search a 2D Matrix	JavaScript		Medium
73	Set Matrix Zeroes	JavaScript	Explanation	Medium
72	Edit Distance			Hard
71	Simplify Path	JavaScript		Medium
70	Climbing Stairs	JavaScript	Explanation	Easy
69	Sqrt(x)	JavaScript	Explanation	Easy
68	Text Justification			Hard
67	Add Binary	JavaScript	Explanation	Easy
66	Plus One	JavaScript	Explanation	Easy
65	Valid Number	JavaScript	Explanation	Hard
64	Minimum Path Sum	JavaScript		Medium
63	Unique Paths II	JavaScript	Explanation	Medium
62	Unique Paths	JavaScript	Explanation	Medium
61	Rotate List	JavaScript	Explanation	Medium
60	Permutation Sequence	JavaScript		Medium
59	Spiral Matrix II	JavaScript		Medium
58	Length of Last Word	JavaScript	Explanation	Easy
57	Insert Interval	JavaScript		Hard
56	Merge Intervals	JavaScript		Medium
55	Jump Game	JavaScript		Medium
54	Spiral Matrix	JavaScript		Medium
53	Maximum Subarray	JavaScript		Easy
52	N-Queens II	JavaScript		Hard
51	N-Queens	JavaScript		Hard
50	Pow(x, n)	JavaScript	Explanation	Medium
49	Group Anagrams	JavaScript		Medium
48	Rotate Image	JavaScript		Medium
47	Permutations II	JavaScript		Medium
46	Permutations	JavaScript		Medium
45	Jump Game II	JavaScript		Hard
44	Wildcard Matching			Hard
43	Multiply Strings	JavaScript		Medium
42	Trapping Rain Water	JavaScript		Hard
41	First Missing Positive	JavaScript	Explanation	Hard
40	Combination Sum II	JavaScript		Medium
39	Combination Sum	JavaScript		Medium
38	Count and Say	JavaScript	Explanation	Easy
37	Sudoku Solver			Hard
36	Valid Sudoku	JavaScript		Medium
35	Search Insert Position	JavaScript	Explanation	Easy
34	Search for a Range	JavaScript	Explanation	Medium
33	Search in Rotated Sorted Array	JavaScript		Medium
32	Longest Valid Parentheses			Hard
31	Next Permutation	JavaScript		Medium
30	Substring with Concatenation of All Words			Hard
29	Divide Two Integers	JavaScript	Explanation	Medium
28	Implement strStr()	JavaScript	Explanation	Easy
27	Remove Element	JavaScript	Explanation	Easy
26	Remove Duplicates from Sorted Array	JavaScript	Explanation	Easy
25	Reverse Nodes in k-Group	JavaScript		Hard
24	Swap Nodes in Pairs	JavaScript	Explanation	Medium
23	Merge k Sorted Lists	JavaScript		Hard
22	Generate Parentheses	JavaScript		Medium
21	Merge Two Sorted Lists	JavaScript	Explanation	Easy
20	Valid Parentheses	JavaScript	Explanation	Easy
19	Remove Nth Node From End of List	JavaScript	Explanation	Medium
18	4Sum	JavaScript		Medium
17	Letter Combinations of a Phone Number	JavaScript	Explanation	Medium
16	3Sum Closest	JavaScript		Medium
15	3Sum	JavaScript		Medium
14	Longest Common Prefix	JavaScript	Explanation	Easy
13	Roman to Integer	JavaScript		Easy
12	Integer to Roman	JavaScript		Medium
11	Container With Most Water	JavaScript		Medium
10	Regular Expression Matching	JavaScript	Explanation	Hard
9	Palindrome Number	JavaScript	Explanation	Easy
8	String to Integer (atoi)	JavaScript		Medium
7	Reverse Integer	JavaScript	Explanation	Easy
6	ZigZag Conversion	JavaScript	Explanation	Medium
5	Longest Palindromic Substring	JavaScript	Explanation	Medium
4	Median of Two Sorted Arrays	JavaScript		Hard
3	Longest Substring Without Repeating Characters	JavaScript		Medium
2	Add Two Numbers	JavaScript		Medium
1	Two Sum	JavaScript	Explanation	Easy