| 1 |
Two Sum |
C++ |
Easy |
2017/03/02 |
| 2 |
Add Two Numbers |
C++ |
Medium |
2017/03/02 |
| 3 |
Longest Substring Without Repeating Characters |
C++ |
Medium |
2017/03/02 |
| 4 |
Median of Two Sorted Arrays |
C |
Hard |
2017/03/02 |
| 5 |
Longest Palindromic Substring |
C++ |
Medium |
2017/03/03 |
| 7 |
Reverse Integer |
C++ |
Easy |
2017/03/02 |
| 8 |
String to Integer(atoi) |
C++ |
Medium |
2017/03/04 |
| 10 |
Regular Expression Matching |
C++ |
Hard |
2017/03/09 |
| 11 |
Container With Most Water |
C++ |
Medium |
2017/03/09 |
| 13 |
Roman to Integer |
C++ |
Easy |
2017/03/02 |
| 14 |
Longest Common Prefix |
C++ |
Easy |
2017/03/09 |
| 15 |
3Sum |
C++ |
Medium |
2017/03/10 |
| 17 |
Letter Combinations of a Phone Number |
C++ |
Medium |
2017/03/11 |
| 19 |
Remove Nth Node From End of List |
C++ |
Medium |
2017/03/11 |
| 20 |
Valid Parentheses |
C++ |
Easy |
2017/03/11 |
| 21 |
Merge Two Sorted Lists |
C++ |
Easy |
2017/03/11 |
| 22 |
Generate Parentheses |
C++ |
Medium |
2017/03/11 |
| 23 |
Merge k Sorted Lists |
C++ |
Hard |
2017/03/12 |
| 26 |
Remove Duplicates from Sorted Array |
C++ |
Easy |
2017/03/12 |
| 28 |
Implement strStr |
C++ |
Easy |
2017/03/12 |
| 29 |
Divide Two Integers |
C++ |
Medium |
2017/03/14 |
| 33 |
Search in Rotated Sorted Array |
C++ |
Medium |
2017/03/16 |
| 34 |
Search for a Range |
C++ |
Medium |
2017/03/16 |
| 36 |
Valid Sudoku |
C++ |
Medium |
2017/03/17 |
| 38 |
Count and Say |
C++ |
Easy |
2017/03/17 |
| 41 |
First Missing Positive |
C++ |
Hard |
2017/03/17 |
| 42 |
Trapping Rain Water |
C++ |
Hard |
2017/03/18 |
| 44 |
Wildcard Matching |
C++ |
Hard |
2017/03/19 |
| 46 |
Permutations |
C++ |
Medium |
2017/03/20 |
| 48 |
Rotate Image |
C++ |
Medium |
2017/03/20 |
| 49 |
Group Anagrams |
C++ |
Medium |
2017/03/21 |
| 50 |
Pow(x, n) |
C++ |
Medium |
2017/03/21 |
| 53 |
Maximum Subarray |
C++ |
Easy |
2017/03/21 |
| 54 |
Spiral Matrix |
C++ |
Medium |
2017/03/22 |
| 55 |
Jump Game |
C++ |
Medium |
2017/03/22 |
| 56 |
Merge Intervals |
C++ |
Medium |
2017/03/23 |
| 66 |
Plus One |
C++ |
Easy |
2017/03/02 |
| 242 |
Valid Anagram |
C++ |
Easy |
2017/03/21 |
| 268 |
Missing Number |
C++ |
Easy |
2017/03/17 |
| 515 |
Find Largest Value in Each Tree Row |
C++ |
Medium |
2017/03/05 |
| 62 |
Unique Paths |
C++ |
Medium |
2017/03/25 |
| 69 |
Sqrt |
C++ |
Easy |
2017/03/26 |
| 70 |
Climbing Stairs |
C++ |
Easy |
2017/03/26 |
| 73 |
Set Matrix Zeroes |
C++ |
Medium |
2017/03/27 |
| 75 |
Sort Colors |
C++ |
Medium |
2017/03/27 |
| 76 |
Minimum Window Substring♣♠♠ |
C++ |
Hard |
2017/03/27 |
| 78 |
Subsets |
C++ |
Medium |
2017/03/29 |
| 79 |
Word Search |
C++ |
Medium |
2017/03/29 |
| 88 |
Merge Sorted Array |
C++ |
Easy |
2017/03/29 |
| 84 |
Largest Rectangle in Histogram |
C++ |
Hard |
2017/03/30 |
| 101 |
Symmetric Tree♠ |
C++ |
Easy |
2017/03/30 |
| 91 |
Decode Ways♣ |
C++ |
Medium |
2017/03/31 |
| 94 |
Binary Tree Inorder Traversal♠ |
C++ |
Medium |
2017/03/31 |
| 98 |
Validate Binary Search Tree♠ |
C++ |
Medium |
2017/03/31 |
| 102 |
Binary Tree Level Order Traversal♠ |
C++ |
Medium |
2017/03/31 |
| 103 |
Binary Tree Zigzag Level Order Traversal |
C++ |
Medium |
2017/03/31 |
| 104 |
Maximum Depth of Binary Tree |
C++ |
Easy |
2017/03/31 |
| 105 |
Construct Binary Tree from Preorder and Inorder Traversal♣ |
C++ |
Medium |
2017/04/01 |
| 108 |
Convert Sorted Array to Binary Search Tree |
C++ |
Easy |
2017/04/01 |
| 116 |
Populating Next Right Pointers in Each Node♠ |
C++ |
Medium |
2017/04/01 |
| 118 |
Pascal's Triangle |
C++ |
Easy |
2017/04/01 |
| 121 |
Best Time to Buy and Sell Stock |
C++ |
Easy |
2017/04/01 |
| 24 |
Swap Nodes in Pairs♠ |
C++ |
Medium |
2017/04/03 |
| 95 |
Unique Binary Search Trees II♣ |
C++ |
Medium |
2017/04/03 |
| 96 |
Unique Binary Search Trees |
C++ |
Medium |
2017/04/03 |
| 100 |
Same Tree |
C++ |
Easy |
2017/04/03 |
| 122 |
Best Time to Buy and Sell Stock II♣ |
C++ |
Easy |
2017/04/03 |
| 125 |
Valid Palindrome |
C++ |
Easy |
2017/04/03 |
| 63 |
Unique Paths II♠ |
C++ |
Medium |
2017/04/03 |
| 64 |
Minimum Path Sum |
C++ |
Medium |
2017/04/03 |
| 51 |
N Queens♠ |
C++ |
Hard |
2017/04/04 |
| 52 |
N Queens II |
C++ |
Hard |
2017/04/04 |
| 169 |
Majority Element |
C++ |
Easy |
2017/04/04 |
| 215 |
[Kth Largest Element in an Array]&spade;215 |
C++ |
Medium |
2017/04/04 |
| 240 |
Search a 2D Matrix II |
C++ |
Medium |
2017/04/04 |
| 241 |
Different Ways to Add Parentheses♣ |
C++ |
Medium |
2017/04/04 |
| 61 |
Rotate List |
C++ |
Medium |
2017/04/05 |
| 82 |
Remove Duplicates from Sorted List II♠ |
C++ |
Medium |
2017/04/05 |
| 83 |
Remove Duplicates from Sorted List |
C++ |
Easy |
2017/04/05 |
| 86 |
Partition List♠ |
C++ |
Medium |
2017/04/05 |
| 92 |
Reverse Linked List II♣ |
C++ |
Medium |
2017/04/05 |
| 141 |
Linked List Cycle♠ |
C++ |
Easy |
2017/04/05 |
| 142 |
Linked List Cycle II♠ |
C++ |
Medium |
2017/04/05 |
| 206 |
Reverse Linked List |
C++ |
Easy |
2017/04/05 |
| 203 |
Remove Linked List Elements♠ |
C++ |
Easy |
2017/04/05 |
| 39 |
Combination Sum♠ |
C++ |
Medium |
2017/04/06 |
| 40 |
Combination Sum II |
C++ |
Medium |
2017/04/06 |
| 47 |
Permutations II♣ |
C++ |
Medium |
2017/04/06 |
| 60 |
Permutation Sequence♦ |
C++ |
Medium |
2017/04/06 |
| 77 |
Combinations |
C++ |
Medium |
2017/04/06 |
| 90 |
Subsets II |
C++ |
Medium |
2017/04/06 |
| 58 |
Length of Last Word |
C++ |
Easy |
2017/04/07 |
| 67 |
Add Binary |
C++ |
Easy |
2017/04/07 |
| 120 |
Triangle |
C++ |
Medium |
2017/04/07 |
| 139 |
Word Break♣ |
C++ |
Medium |
2017/04/07 |
| 152 |
Maximum Product Subarray♣ |
C++ |
Medium |
2017/04/07 |
| 198 |
House Robber♠ |
C++ |
Easy |
2017/04/09 |
| 213 |
House Robber II |
C++ |
Medium |
2017/04/09 |
| 221 |
Maximal Square |
C++ |
Medium |
2017/04/09 |
| 263 |
Ugly Number |
C++ |
Easy |
2017/04/09 |
| 264 |
Ugly Number II♣ |
C++ |
Medium |
2017/04/09 |
| 279 |
Perfect Squares♣ |
C++ |
Medium |
2017/04/09 |
| 300 |
Longest Increasing Subsequence♦ |
C++ |
Medium |
2017/04/09 |
| 303 |
Range Sum Query Immutable |
C++ |
Easy |
2017/04/09 |
| 322 |
Coin Change |
C++ |
Medium |
2017/04/09 |
| 304 |
Range Sum Query 2D Immutable |
C++ |
Medium |
2017/04/10 |
| 309 |
Best Time to Buy and Sell Stock with Cooldown♠♣ |
C++ |
Medium |
2017/04/10 |
| 136 |
Single Number♠ |
C++ |
Easy |
2017/04/10 |
| 338 |
Counting Bits♦ |
C++ |
Medium |
2017/04/11 |
| 343 |
Integer Break♦ |
C++ |
Medium |
2017/04/11 |
| 357 |
Count Numbers with Unique Digits♦ |
C++ |
Medium |
2017/04/11 |
| 368 |
Largest Divisible Subset♣ |
C++ |
Medium |
2017/04/11 |
| 106 |
Construct Binary Tree from Inorder and Postorder Traversal |
C++ |
Medium |
2017/04/12 |
| 107 |
Binary Tree Level Order Traversal II♠ |
C++ |
Easy |
2017/04/12 |
| 110 |
Balanced Binary Tree♠ |
C++ |
Easy |
2017/04/12 |
| 111 |
Minimum Depth of Binary Tree♠ |
C++ |
Easy |
2017/04/12 |
| 112 |
Path Sum♣ |
C++ |
Easy |
2017/04/12 |
| 113 |
Path Sum II |
C++ |
Medium |
2017/04/12 |
| 109 |
Convert Sorted List to Binary Search Tree♠ |
C++ |
Medium |
2017/04/13 |
| 138 |
Copy List with Random Pointer♠ |
C++ |
Medium |
2017/04/13 |
| 89 |
Gray Code♣ |
C++ |
Medium |
2017/04/18 |
| 93 |
Restore IP Addresses♣ |
C++ |
Medium |
2017/04/18 |
| 131 |
Palindrome Partitioning |
C++ |
Medium |
2017/04/18 |
| 216 |
Combination Sum III |
C++ |
Medium |
2017/04/18 |
| 401 |
Binary Watch |
C++ |
Easy |
2017/04/18 |
| 16 |
3Sum Closest |
C++ |
Medium |
2017/04/20 |
| 18 |
4Sum♠ |
C++ |
Medium |
2017/04/20 |
| 27 |
Remove Element |
C++ |
Easy |
2017/04/20 |
| 208 |
Implement Trie♠ |
C++ |
Medium |
2017/04/20 |
| 211 |
Add and Search Word Data structure design♠ |
C++ |
Medium |
2017/04/20 |
| 374 |
Guess Number Higher or Lower |
C++ |
Easy |
2017/04/20 |
| 375 |
Guess Number Higher or Lower II♣ |
C++ |
Medium |
2017/04/20 |
| 421 |
Maximum XOR of Two Numbers in an Array♣ |
C++ |
Medium |
2017/04/20 |
| 526 |
Beautiful Arrangement |
C++ |
Medium |
2017/04/20 |
| 31 |
Next Permutation♦ |
C++ |
Medium |
2017/04/20 |
| 35 |
Search Insert Position♠ |
C++ |
Easy |
2017/04/20 |
| 59 |
Spiral Matrix II♠ |
C++ |
Medium |
2017/04/20 |
| 74 |
Search a 2D Matrix♣ |
C++ |
Medium |
2017/04/20 |
| 167 |
Two Sum II Input array is sorted |
C++ |
Easy |
2017/04/20 |
| 376 |
Wiggle Subsequence♣ |
C++ |
Medium |
2017/04/24 |
| 377 |
Combination Sum IV♣ |
C++ |
Medium |
2017/04/24 |
| 392 |
Is Subsequence |
C++ |
Medium |
2017/04/24 |
| 413 |
Arithmetic Slices |
C++ |
Medium |
2017/04/24 |
| 416 |
Partition Equal Subset Sum♠♣ |
C++ |
Medium |
2017/04/24 |
| 467 |
Unique Substrings in Wraparound String♦♣ |
C++ |
Medium |
2017/04/24 |
| 486 |
Predict the Winner♠♣ |
C++ |
Medium |
2017/04/24 |
| 494 |
Target Sum♠ |
C++ |
Medium |
2017/04/24 |
| 516 |
Longest Palindromic Subsequence |
C++ |
Medium |
2017/04/24 |
| 80 |
Remove Duplicates from Sorted Array II♣ |
C++ |
Medium |
2017/04/26 |
| 119 |
Pascals Triangle II♠ |
C++ |
Easy |
2017/04/26 |
| 153 |
Find Minimum in Rotated Sorted Array♠♣ |
C++ |
Medium |
2017/04/26 |
| 217 |
Contains Duplicate |
C++ |
Easy |
2017/04/26 |
| 219 |
Contains Duplicate II♦ |
C++ |
Easy |
2017/04/26 |
| 523 |
Continuous Subarray Sum♦ |
C++ |
Medium |
2017/04/26 |
| 530 |
Minimum Absolute Difference in BST |
C++ |
Easy |
2017/04/26 |
| 06 |
ZigZag Conversion |
C++ |
Medium |
2017/05/02 |
| 81 |
Search in Rotated Sorted Array II♠ |
C++ |
Medium |
2017/05/02 |
| 143 |
Reorder List |
C++ |
Medium |
2017/05/02 |
| 151 |
Reverse Words in a String |
C++ |
Medium |
2017/05/02 |
| 160 |
Intersection of Two Linked Lists♠ |
C++ |
Easy |
2017/05/02 |
| 162 |
Find Peak Element |
C++ |
Medium |
2017/05/02 |
| 234 |
Palindrome Linked List |
C++ |
Easy |
2017/05/02 |
| 344 |
Reverse String |
C++ |
Easy |
2017/05/02 |
| 345 |
Reverse Vowels of a String |
C++ |
Easy |
2017/05/02 |
| 383 |
Ransom Note |
C++ |
Easy |
2017/05/02 |
| 434 |
Number of Segments in a String |
C++ |
Easy |
2017/05/02 |
| 09 |
Palindrome Number♠ |
C++ |
Easy |
2017/05/04 |
| 189 |
Rotate Array♠ |
C++ |
Easy |
2017/05/04 |
| 202 |
Happy Number♠ |
C++ |
Easy |
2017/05/04 |
| 204 |
Count Primes♠♠ |
C++ |
Easy |
2017/05/04 |
| 205 |
Isomorphic Strings♠ |
C++ |
Easy |
2017/05/04 |
| 237 |
Delete Node in a Linked List♠ |
C++ |
Easy |
2017/05/04 |
| 328 |
Odd Even Linked List |
C++ |
Medium |
2017/05/04 |
| 445 |
Add Two Numbers II♠ |
C++ |
Medium |
2017/05/04 |
| 464 |
Can I Win♣♣ |
C++ |
Medium |
2017/05/04 |
| 474 |
Ones and Zeroes♣ |
C++ |
Medium |
2017/05/04 |
| 43 |
Multiply Strings♣ |
C++ |
Medium |
2017/05/07 |
| 114 |
Flatten Binary Tree to Linked List♠ |
C++ |
Medium |
2017/05/07 |
| 117 |
Populating Next Right Pointers in Each Node II♣ |
C++ |
Medium |
2017/05/07 |
| 129 |
Sum Root to Leaf Numbers♠ |
C++ |
Medium |
2017/05/07 |
| 144 |
Binary Tree Preorder Traversal♠ |
C++ |
Medium |
2017/05/07 |
| 145 |
Binary Tree Postorder Traversal♠ |
C++ |
Hard |
2017/05/07 |
| 209 |
Minimum Size Subarray Sum♣ |
C++ |
Medium |
2017/05/07 |
| 415 |
Add Strings♠ |
C++ |
Easy |
2017/05/07 |
| 71 |
Simplify Path♠ |
C++ |
Medium |
2017/05/17 |
| 127 |
Word Ladder♠♣ |
C++ |
Medium |
2017/05/17 |
| 147 |
Insertion Sort List♠ |
C++ |
Medium |
2017/05/17 |
| 148 |
Sort List♠ |
C++ |
Medium |
2017/05/17 |
| 228 |
Summary Ranges |
C++ |
Medium |
2017/05/17 |
| 230 |
Kth Smallest Element in a BST♠ |
C++ |
Medium |
2017/05/17 |
| 290 |
Word Pattern♠ |
C++ |
Easy |
2017/05/17 |
| 349 |
Intersection of Two Arrays |
C++ |
Easy |
2017/05/17 |
| 350 |
Intersection of Two Arrays II♠ |
C++ |
Easy |
2017/05/17 |
| 441 |
Arranging Coins♦ |
C++ |
Easy |
2017/05/17 |
| 130 |
Surrounded Regions♠ |
C++ |
Medium |
2017/06/02 |
| 133 |
Clone Graph♠♠ |
C++ |
Medium |
2017/06/02 |
| 137 |
Single Number II♠ |
C++ |
Medium |
2017/06/02 |
| 155 |
Min Stack♠ |
C++ |
Easy |
2017/06/02 |
| 165 |
Compare Version Numbers♦ |
C++ |
Medium |
2017/06/02 |
| 168 |
Excel Sheet Column Title♠ |
C++ |
Easy |
2017/06/02 |
| 171 |
Excel Sheet Column Number♠ |
C++ |
Easy |
2017/06/02 |
| 190 |
Reverse Bits |
C++ |
Easy |
2017/06/02 |
| 191 |
Number of 1 Bits♠ |
C++ |
Easy |
2017/06/02 |
| 207 |
Course Schedule♠♦ |
C++ |
Medium |
2017/06/02 |
| 260 |
Single Number III♠♠ |
C++ |
Medium |
2017/06/02 |
| 475 |
Heaters♠&sapdes; |
C++ |
Easy |
2017/06/02 |
| 521 |
Longest Uncommon Subsequence I |
C++ |
Easy |
2017/06/02 |
| 522 |
Longest Uncommon Subsequence II♦ |
C++ |
Medium |
2017/06/02 |
| 12 |
Integer to Roman♦ |
C++ |
Medium |
2017/06/29 |
| 97 |
Interleaving String♠♠ |
C++ |
Hard |
2017/06/29 |
| 134 |
Gas Station♣ |
C++ |
Medium |
2017/06/29 |
| 150 |
Evaluate Reverse Polish Notation |
C++ |
Medium |
2017/06/29 |
| 166 |
Fraction to Recurring Decimal♣ |
C++ |
Medium |
2017/06/29 |
| 172 |
Factorial Trailing Zeroes♦ |
C++ |
Easy |
2017/06/29 |
| 173 |
Binary Search Tree Iterator |
C++ |
Medium |
2017/06/29 |
| 179 |
Largest Number♠ |
C++ |
Medium |
2017/06/29 |
| 187 |
Repeated DNA Sequences♠♠ |
C++ |
Medium |
2017/06/29 |
| 199 |
Binary Tree Right Side View |
C++ |
Medium |
2017/06/29 |
| 200 |
Number of Islands♠♠ |
C++ |
Medium |
2017/06/29 |
| 201 |
Bitwise AND of Numbers Range♣ |
C++ |
Medium |
2017/06/29 |
| 210 |
Course Schedule II♠♣ |
C++ |
Medium |
2017/06/29 |
| 220 |
Contains Duplicate III♣ |
C++ |
Medium |
2017/06/29 |
| 222 |
Count Complete Tree Nodes♠ |
C++ |
Medium |
2017/06/29 |
| 223 |
Rectangle Area |
C++ |
Medium |
2017/06/29 |
| 225 |
Implement Stack using Queues♠♠ |
C++ |
Easy |
2017/06/29 |
| 226 |
Invert Binary Tree |
C++ |
Easy |
2017/06/29 |
| 231 |
Power of Two |
C++ |
Easy |
2017/06/29 |
| 326 |
Power of Three♠ |
C++ |
Easy |
2017/06/29 |
| 342 |
Power of Four♠ |
C++ |
Easy |
2017/06/29 |
| 400 |
Nth Digit♣ |
C++ |
Easy |
2017/06/29 |
| 581 |
Shortest Unsorted Continuous Subarray♣ |
C++ |
Easy |
2017/06/29 |
| 295 |
Find Median From Data Stream♠♣ |
C++ |
Hard |
2017/07/01 |
| 480 |
Sliding Window Median♠♣ |
C++ |
Hard |
2017/07/01 |
| 72 |
Edit Distance♠♠ |
C++ |
Hard |
2017/07/06 |
| 233 |
Number of Digit One♣ |
C++ |
Hard |
2017/07/06 |
| 30 |
Substring with Concatenation of All Words♣♠♠ |
C++ |
Hard |
2017/07/07 |
| 438 |
Find All Anagrams in a String♠♠ |
C++ |
Easy |
2017/07/07 |
| 212 |
Word Search II♣♣ |
C++ |
Hard |
2017/07/14 |
| 493 |
Reverse Pairs♣♣ |
C++ |
Hard |
2017/07/14 |
| 32 |
Longest Valid Parentheses♠♣ |
C++ |
Hard |
2017/07/15 |
| 572 |
Subtree of Another Tree♣ |
C++ |
Easy |
2017/07/15 |
| 146 |
LRU Cache♠♣ |
C++ |
Hard |
2017/07/20 |
| 229 |
Majority Element II♠♠ |
C++ |
Medium |
2017/07/20 |
| 347 |
Top K Frequent Elements♠♣ |
C++ |
Medium |
2017/07/20 |
| 460 |
LFU Cache♣♣ |
C++ |
Hard |
2017/07/20 |
| 123 |
Best Time to Buy and Sell Stock III |
C++ |
Hard |
2017/08/30 |
| 124 |
Binary Tree Maximum Path Sum |
C++ |
Hard |
2017/08/30 |
| 149 |
Max Points on a Line |
C++ |
Hard |
2017/08/30 |
| 235 |
Lowest Common Ancestor of a Binary Search Tree |
C++ |
Easy |
2017/08/30 |
| 236 |
Lowest Common Ancestor of a Binary Tree |
C++ |
Medium |
2017/08/30 |
| 315 |
Count of Smaller Numbers After Self |
C++ |
Hard |
2017/08/30 |
| 327 |
Count of Range Sum |
C++ |
Hard |
2017/08/30 |
| 402 |
Remove K Digits |
C++ |
Medium |
2017/08/30 |
| 459 |
Repeated Substring Pattern |
C++ |
Easy |
2017/08/30 |
| 541 |
Reverse String II |
C++ |
Easy |
2017/08/30 |
| 542 |
01 Matrix |
C++ |
Medium |
2017/08/30 |
| 557 |
Reverse Words in a String III |
C++ |
Easy |
2017/08/30 |
| 561 |
Array Partition I |
C++ |
Easy |
2017/08/30 |
| 567 |
Permutation in String |
C++ |
Medium |
2017/08/30 |
| 628 |
Maximum Product of Three Numbers |
C++ |
Easy |
2017/08/30 |