标签：
| 228 | Summary Ranges | 21.10% | Easy |
| 227 | Basic Calculator II | 18.00% | Medium |
| 226 | Invert Binary Tree | 35.40% | Easy |
| 225 | Implement Stack using Queues | 29.60% | Medium |
| 224 | Basic Calculator | 15.80% | Medium |
| 223 | Rectangle Area | 25.60% | Easy |
| 222 | Count Complete Tree Nodes | 19.40% | Medium |
| 221 | Maximal Square | 20.30% | Medium |
| 220 | Contains Duplicate III | 15.30% | Medium |
| 219 | Contains Duplicate II | 25.60% | Easy |
| 218 | The Skyline Problem | 16.20% | Hard |
| 217 | Contains Duplicate | 35.90% | Easy |
| 216 | Combination Sum III | 27.70% | Medium |
| 215 | Kth Largest Element in an Array | 27.30% | Medium |
| 214 | Shortest Palindrome | 16.80% | Hard |
| 213 | House Robber II | 26.30% | Medium |
| 212 | Word Search II | 15.00% | Hard |
| 211 | Add and Search Word - Data structure design | 20.70% | Medium |
| 210 | Course Schedule II | 19.30% | Medium |
| 209 | Minimum Size Subarray Sum | 22.90% | Medium |
| 208 | Implement Trie (Prefix Tree) | 24.80% | Medium |
| 207 | Course Schedule | 21.70% | Medium |
| 206 | Reverse Linked List | 31.50% | Easy |
| 205 | Isomorphic Strings | 24.20% | Easy |
| 204 | Count Primes | 19.00% | Easy |
| 203 | Remove Linked List Elements | 25.80% | Easy |
| 202 | Happy Number | 31.40% | Easy |
| 201 | Bitwise AND of Numbers Range | 23.30% | Medium |
| 200 | Number of Islands | 21.90% | Medium |
| 199 | Binary Tree Right Side View | 27.10% | Medium |
| 198 | House Robber | 28.80% | Easy |
| 191 | Number of 1 Bits | 37.30% | Easy |
| 190 | Reverse Bits | 28.40% | Easy |
| 189 | Rotate Array | 17.80% | Easy |
| 188 | Best Time to Buy and Sell Stock IV | 17.30% | Hard |
| 187 | Repeated DNA Sequences | 19.50% | Medium |
| 186 | Reverse Words in a String II | 31.10% | Medium |
| 179 | Largest Number | 15.70% | Medium |
| 174 | Dungeon Game | 17.70% | Hard |
| 173 | Binary Search Tree Iterator | 29.30% | Medium |
| 172 | Factorial Trailing Zeroes | 28.40% | Easy |
| 171 | Excel Sheet Column Number | 36.50% | Easy |
| 170 | Two Sum III - Data structure design | 24.70% | Easy |
| 169 | Majority Element | 35.00% | Easy |
| 168 | Excel Sheet Column Title | 18.10% | Easy |
| 167 | Two Sum II - Input array is sorted | 43.30% | Medium |
| 166 | Fraction to Recurring Decimal | 12.70% | Medium |
| 165 | Compare Version Numbers | 15.20% | Easy |
| 164 | Maximum Gap | 24.40% | Hard |
| 163 | Missing Ranges | 24.10% | Medium |
| 162 | Find Peak Element | 31.50% | Medium |
| 161 | One Edit Distance | 24.00% | Medium |
| 160 | Intersection of Two Linked Lists | 28.70% | Easy |
| 159 | Longest Substring with At Most Two Distinct Characters | 30.20% | Hard |
| 158 | Read N Characters Given Read4 II - Call multiple times | 22.30% | Hard |
| 157 | Read N Characters Given Read4 | 29.80% | Easy |
| 156 | Binary Tree Upside Down | 34.30% | Medium |
| 155 | Min Stack | 18.50% | Easy |
| 154 | Find Minimum in Rotated Sorted Array II | 31.90% | Hard |
| 153 | Find Minimum in Rotated Sorted Array | 33.30% | Medium |
| 152 | Maximum Product Subarray | 19.40% | Medium |
| 151 | Reverse Words in a String | 15.10% | Medium |
| 150 | Evaluate Reverse Polish Notation | 21.10% | Medium |
| 149 | Max Points on a Line | 12.60% | Hard |
| 148 | Sort List | 22.00% | Medium |
| 147 | Insertion Sort List | 26.40% | Medium |
| 146 | LRU Cache | 15.00% | Hard |
| 145 | Binary Tree Postorder Traversal | 32.40% | Hard |
| 144 | Binary Tree Preorder Traversal | 36.30% | Medium |
| 143 | Reorder List | 21.00% | Medium |
| 142 | Linked List Cycle II | 31.40% | Medium |
| 141 | Linked List Cycle | 36.30% | Medium |
| 140 | Word Break II | 17.70% | Hard |
| 139 | Word Break | 23.00% | Medium |
| 138 | Copy List with Random Pointer | 25.10% | Hard |
| 137 | Single Number II | 35.00% | Medium |
| 136 | Single Number | 45.10% | Medium |
| 135 | Candy | 20.50% | Hard |
| 134 | Gas Station | 25.70% | Medium |
| 133 | Clone Graph | 24.00% | Medium |
| 132 | Palindrome Partitioning II | 19.70% | Hard |
| 131 | Palindrome Partitioning | 26.70% | Medium |
| 130 | Surrounded Regions | 14.60% | Medium |
| 129 | Sum Root to Leaf Numbers | 30.30% | Medium |
| 128 | Longest Consecutive Sequence | 29.40% | Hard |
| 127 | Word Ladder | 19.30% | Medium |
| 126 | Word Ladder II | 12.90% | Hard |
| 125 | Valid Palindrome | 22.00% | Easy |
| 124 | Binary Tree Maximum Path Sum | 21.50% | Hard |
| 123 | Best Time to Buy and Sell Stock III | 23.90% | Hard |
| 122 | Best Time to Buy and Sell Stock II | 38.30% | Medium |
| 121 | Best Time to Buy and Sell Stock | 32.60% | Medium |
| 120 | Triangle | 27.40% | Medium |
| 119 | Pascal‘s Triangle II | 29.40% | Easy |
| 118 | Pascal‘s Triangle | 30.10% | Easy |
| 117 | Populating Next Right Pointers in Each Node II | 32.00% | Hard |
| 116 | Populating Next Right Pointers in Each Node | 36.20% | Medium |
| 115 | Distinct Subsequences | 26.30% | Hard |
| 114 | Flatten Binary Tree to Linked List | 28.80% | Medium |
| 113 | Path Sum II | 26.60% | Medium |
| 112 | Path Sum | 29.80% | Easy |
| 111 | Minimum Depth of Binary Tree | 29.10% | Easy |
| 110 | Balanced Binary Tree | 32.00% | Easy |
| 109 | Convert Sorted List to Binary Search Tree | 27.90% | Medium |
| 108 | Convert Sorted Array to Binary Search Tree | 34.00% | Medium |
| 107 | Binary Tree Level Order Traversal II | 31.10% | Easy |
| 106 | Construct Binary Tree from Inorder and Postorder Traversal | 26.80% | Medium |
| 105 | Construct Binary Tree from Preorder and Inorder Traversal | 26.40% | Medium |
| 104 | Maximum Depth of Binary Tree | 45.10% | Easy |
| 103 | Binary Tree Zigzag Level Order Traversal | 26.40% | Medium |
| 102 | Binary Tree Level Order Traversal | 29.30% | Easy |
| 101 | Symmetric Tree | 31.60% | Easy |
| 100 | Same Tree | 41.80% | Easy |
| 99 | Recover Binary Search Tree | 24.30% | Hard |
| 98 | Validate Binary Search Tree | 20.60% | Medium |
| 97 | Interleaving String | 20.80% | Hard |
| 96 | Unique Binary Search Trees | 36.00% | Medium |
| 95 | Unique Binary Search Trees II | 28.00% | Medium |
| 94 | Binary Tree Inorder Traversal | 36.20% | Medium |
| 93 | Restore IP Addresses | 21.00% | Medium |
| 92 | Reverse Linked List II | 26.10% | Medium |
| 91 | Decode Ways | 16.40% | Medium |
| 90 | Subsets II | 27.70% | Medium |
| 89 | Gray Code | 32.80% | Medium |
| 88 | Merge Sorted Array | 29.70% | Easy |
| 87 | Scramble String | 24.20% | Hard |
| 86 | Partition List | 27.50% | Medium |
| 85 | Maximal Rectangle | 22.00% | Hard |
| 84 | Largest Rectangle in Histogram | 22.60% | Hard |
| 83 | Remove Duplicates from Sorted List | 34.50% | Easy |
| 82 | Remove Duplicates from Sorted List II | 25.00% | Medium |
| 81 | Search in Rotated Sorted Array II | 31.40% | Medium |
| 80 | Remove Duplicates from Sorted Array II | 30.50% | Medium |
| 79 | Word Search | 20.30% | Medium |
| 78 | Subsets | 28.20% | Medium |
| 77 | Combinations | 30.90% | Medium |
| 76 | Minimum Window Substring | 18.90% | Hard |
| 75 | Sort Colors | 32.60% | Medium |
| 74 | Search a 2D Matrix | 31.60% | Medium |
| 73 | Set Matrix Zeroes | 31.40% | Medium |
| 72 | Edit Distance | 26.20% | Hard |
| 71 | Simplify Path | 20.00% | Medium |
| 70 | Climbing Stairs | 34.40% | Easy |
| 69 | Sqrt(x) | 23.10% | Medium |
| 68 | Text Justification | 14.60% | Hard |
| 67 | Add Binary | 24.70% | Easy |
| 66 | Plus One | 30.40% | Easy |
| 65 | Valid Number | 11.40% | Hard |
| 64 | Minimum Path Sum | 32.20% | Medium |
| 63 | Unique Paths II | 28.00% | Medium |
| 62 | Unique Paths | 32.80% | Medium |
| 61 | Rotate List | 21.70% | Medium |
| 60 | Permutation Sequence | 22.80% | Medium |
| 59 | Spiral Matrix II | 31.80% | Medium |
| 58 | Length of Last Word | 28.00% | Easy |
| 57 | Insert Interval | 21.40% | Hard |
| 56 | Merge Intervals | 22.40% | Hard |
| 55 | Jump Game | 27.00% | Medium |
| 54 | Spiral Matrix | 20.80% | Medium |
| 53 | Maximum Subarray | 34.50% | Medium |
| 52 | N-Queens II | 35.80% | Hard |
| 51 | N-Queens | 26.50% | Hard |
| 50 | Pow(x, n) | 26.70% | Medium |
| 49 | Anagrams | 24.30% | Medium |
| 48 | Rotate Image | 31.90% | Medium |
| 47 | Permutations II | 25.80% | Hard |
| 46 | Permutations | 31.90% | Medium |
| 45 | Jump Game II | 24.20% | Hard |
| 44 | Wildcard Matching | 15.00% | Hard |
| 43 | Multiply Strings | 21.00% | Medium |
| 42 | Trapping Rain Water | 30.00% | Hard |
| 41 | First Missing Positive | 22.90% | Hard |
| 40 | Combination Sum II | 25.20% | Medium |
| 39 | Combination Sum | 27.90% | Medium |
| 38 | Count and Say | 25.20% | Easy |
| 37 | Sudoku Solver | 21.80% | Hard |
| 36 | Valid Sudoku | 27.20% | Easy |
| 35 | Search Insert Position | 35.40% | Medium |
| 34 | Search for a Range | 27.50% | Medium |
| 33 | Search in Rotated Sorted Array | 28.80% | Hard |
| 32 | Longest Valid Parentheses | 20.90% | Hard |
| 31 | Next Permutation | 25.00% | Medium |
| 30 | Substring with Concatenation of All Words | 19.40% | Hard |
| 29 | Divide Two Integers | 15.00% | Medium |
| 28 | Implement strStr() | 22.20% | Easy |
| 27 | Remove Element | 32.10% | Easy |
| 26 | Remove Duplicates from Sorted Array | 31.30% | Easy |
| 25 | Reverse Nodes in k-Group | 25.50% | Hard |
| 24 | Swap Nodes in Pairs | 32.50% | Medium |
| 23 | Merge k Sorted Lists | 21.10% | Hard |
| 22 | Generate Parentheses | 32.60% | Medium |
| 21 | Merge Two Sorted Lists | 32.70% | Easy |
| 20 | Valid Parentheses | 26.50% | Easy |
| 19 | Remove Nth Node From End of List | 27.10% | Easy |
| 18 | 4Sum | 21.70% | Medium |
| 17 | Letter Combinations of a Phone Number | 25.80% | Medium |
| 16 | 3Sum Closest | 26.90% | Medium |
| 15 | 3Sum | 16.90% | Medium |
| 14 | Longest Common Prefix | 25.50% | Easy |
| 13 | Roman to Integer | 34.00% | Easy |
| 12 | Integer to Roman | 33.80% | Medium |
| 11 | Container With Most Water | 32.00% | Medium |
| 10 | Regular Expression Matching | 20.70% | Hard |
| 9 | Palindrome Number | 28.30% | Easy |
| 8 | String to Integer (atoi) | 13.00% | Easy |
| 7 | Reverse Integer | 25.10% | Easy |
| 6 | ZigZag Conversion | 21.80% | Easy |
| 5 | Longest Palindromic Substring | 20.70% | Medium |
| 4 | Median of Two Sorted Arrays | 17.40% | Hard |
| 3 | Longest Substring Without Repeating Characters | 20.60% | Medium |
| 2 | Add Two Numbers | 21.10% | Medium |
| 1 | Two Sum | 17.70% | Medium |
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原文地址：http://www.cnblogs.com/grandyang/p/4606334.html
