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:pencil2: LeetCode solutions using JavaScript step by step

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✏️ Leetcode Solutions with JavaScript

Update time: Wed Oct 19 2016 14:28:26 GMT+0800 (**标准时间)

I have solved 272 / 405 problems while there are 75 problems still locked.

If you have any question, please give me an issue.

If you are loving solving problems using JavaScript, please contact me to enjoy it together!

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

# Title Source Code Explanation Difficulty
425 Word Squares 📘 Hard
424 Longest Repeating Character Replacement Medium
423 Reconstruct Original Digits from English JavaScript Medium
422 Valid Word Square 📘 Easy
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
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 Medium
397 Integer Replacement JavaScript Medium
396 Rotate Function JavaScript Easy
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 Medium
383 Ransom Note JavaScript Easy
382 Linked List Random Node Medium
381 Insert Delete GetRandom O(1) - Duplicates allowed Hard
380 Insert Delete GetRandom O(1) Hard
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 Medium
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 Easy
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 📘 Easy
287 Find the Duplicate Number JavaScript Explanation Hard
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 Medium
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 📘 Medium
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 📘 Easy
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 Easy
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 Medium
166 Fraction to Recurring Decimal JavaScript Explanation Medium
165 Compare Version Numbers JavaScript Explanation Easy
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 Hard
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 Medium
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 Hard
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 Medium
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 Easy
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 Medium
70 Climbing Stairs JavaScript Explanation Easy
69 Sqrt(x) JavaScript Explanation Medium
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 Hard
55 Jump Game JavaScript Medium
54 Spiral Matrix JavaScript Medium
53 Maximum Subarray JavaScript Medium
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 Easy
35 Search Insert Position JavaScript Explanation Medium
34 Search for a Range JavaScript Explanation Medium
33 Search in Rotated Sorted Array JavaScript Hard
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 Easy
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 Easy
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 Easy
7 Reverse Integer JavaScript Explanation Easy
6 ZigZag Conversion JavaScript Explanation Easy
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