難易度排序 # 題目 通過率 344 Reverse String 59% 292 Nim Game 54% 371 Sum of Two Integers 52% 258 Add Digits 49% 104 Maximum Depth of Binary Tree 49% 226 Invert Binary Tree 47% 283 Move Zeroes 46% 349 Intersection of Two Arrays 44% 237 Delete Node in a Linked List 44% 100 Same Tree 44% 171 Excel Sheet Column Number 43% 242 Valid Anagram 43% 169 Majority Element 43% 217 Contains Duplicate 42% 350 Intersection of Two Arrays II 42% 13 Roman to Integer 41% 206 Reverse Linked List 41% 231 Power of Two 38% 326 Power of Three 38% 191 Number of 1 Bits 38% 202 Happy Number 38% 263 Ugly Number 38% 83 Remove Duplicates from Sorted List 38% 235 Lowest Common Ancestor of a Binary Search Tree 38% 70 Climbing Stairs 37% 121 Best Time to Buy and Sell Stock 37% 141 Linked List Cycle 36% 21 Merge Two Sorted Lists 36% 345 Reverse Vowels of a String 36% 24 Swap Nodes in Pairs 36% 198 House Robber 36% 342 Power of Four 36% 107 Binary Tree Level Order Traversal II 35% 27 Remove Element 35% 101 Symmetric Tree 35% 66 Plus One 35% 110 Balanced Binary Tree 35% 118 Pascal's Triangle 35% 232 Implement Queue using Stacks 34% 26 Remove Duplicates from Sorted Array 34% 102 Binary Tree Level Order Traversal 34% 172 Factorial Trailing Zeroes 34% 119 Pascal's Triangle II 33% 9 Palindrome Number 33% 36 Valid Sudoku 32% 112 Path Sum 32% 374 Guess Number Higher or Lower 31% 299 Bulls and Cows 31% 111 Minimum Depth of Binary Tree 31% 205 Isomorphic Strings 31% 225 Implement Stack using Queues 31% 223 Rectangle Area 31% 257 Binary Tree Paths 31% 160 Intersection of Two Linked Lists 31% 219 Contains Duplicate II 31% 88 Merge Sorted Array 31% 19 Remove Nth Node From End of List 31% 290 Word Pattern 31% 38 Count and Say 30% 20 Valid Parentheses 30% 58 Length of Last Word 30% 203 Remove Linked List Elements 30% 234 Palindrome Linked List 30% 190 Reverse Bits 29% 14 Longest Common Prefix 29% 67 Add Binary 29% 28 Implement strStr() 26% 303 Range Sum Query - Immutable 26% 204 Count Primes 25% 1 Two Sum 25% 6 ZigZag Conversion 25% 125 Valid Palindrome 24% 7 Reverse Integer 24% 155 Min Stack 24% 278 First Bad Version 23% 168 Excel Sheet Column Title 23% 189 Rotate Array 22% 165 Compare Version Numbers 18% 8 String to Integer (atoi) 14%