leetcode题目难度以及考频

ID题目难度

完成1Two Sum2 2Add Two Numbers3

3Longest Substring Without Repeating Characters3

4Median of Two Sorted Arrays5

5Longest Palindromic Substring4

6ZigZag Conversion3完成7Reverse Integer2完成8String to Integer (atoi)2 9Palindrome Number2

10Regular Expression Matching5

11Container With Most Water3完成12Integer to Roman3完成13Roman to Integer2完成14Longest Common Prefix2 153Sum3

163Sum Closest3

17Letter Combinations of a Phone Number3

184Sum3

19Remove Nth Node From End of List2

20Valid Parentheses2

21Merge Two Sorted Lists2

22Generate Parentheses3 23Merge k Sorted Lists3

24Swap Nodes in Pairs2 25Reverse Nodes in k-Group4

26Remove Duplicates from Sorted Array1 27Remove Element1 28Implement strStr()4

29Divide Two Integers4

30Substring with Concatenation of All Words3 31Next Permutation5 32Longest Valid Parentheses4 33Search in Rotated Sorted Array4 34Search for a Range4 35Search Insert Position2 36Valid Sudoku2

37Sudoku Solver4

38Count and Say2

39Combination Sum3

40Combination Sum II4

41First Missing Positive5

42Trapping Rain Water4

43Multiply Strings4

44Wildcard Matching5

45Jump Game II4

46Permutations3

47Permutations II4

48Rotate Image4

49Anagrams3完成50Pow(x, n)3

51N-Queens4

52N-Queens II4

53Maximum Subarray3

54Spiral Matrix4

55Jump Game3 56Merge Intervals4

57Insert Interval4

58Length of Last Word1 59Spiral Matrix II3 60Permutation Sequence5

61Rotate List3 62Unique Paths2 63Unique Paths II3 64Minimum Path Sum3 65Valid Number2 66Plus One1 67Add Binary2

68Text Justification4 69Sqrt(x)4 70Climbing Stairs2 71Simplify Path3 72Edit Distance4

73Set Matrix Zeroes3 74Search a 2D Matrix3 75Sort Colors4

76Minimum Window Substring4 77Combinations3 78Subsets3

79Word Search3 80Remove Duplicates from Sorted Array II2 81Search in Rotated Sorted Array II5 82Remove Duplicates from Sorted List II3

83Remove Duplicates from Sorted List1 84Largest Rectangle in Histogram5 85Maximal Rectangle5

86Partition List3 87Scramble String5

88Merge Sorted Array2

89Gray Code4 90Subsets II4

91Decode Ways3

92Reverse Linked List II3 93Restore IP Addresses3 94Binary Tree Inorder Traversal4

95Unique Binary Search Trees II4

96Unique Binary Search Trees3 97Interleaving String5

98Validate Binary Search Tree3 99Recover Binary Search Tree4 100Same Tree1 101Symmetric Tree1 102Binary Tree Level Order Traversal3 103Binary Tree Zigzag Level Order Traversal4

104Maximum Depth of Binary Tree1 105Construct Binary Tree from Preorder and Inorder Tr3

106Construct Binary Tree from Inorder and Postorder T3

107Binary Tree Level Order Traversal II3 108Convert Sorted Array to Binary Search Tree2 109Convert Sorted List to Binary Search Tree4

110Balanced Binary Tree1 111Minimum Depth of Binary Tree1 112Path Sum1 113Path Sum II2 114Flatten Binary Tree to Linked List3

115Distinct Subsequences4 116Populating Next Right Pointers in Each Node3 117Populating Next Right Pointers in Each Node II4 118Pascal's Triangle2 119Pascal's Triangle II2 120Triangle3 121Best Time to Buy and Sell Stock2 122Best Time to Buy and Sell Stock II3 123Best Time to Buy and Sell Stock III4 124Binary Tree Maximum Path Sum4 125Valid Palindrome2 126Word Ladder II1 127Word Ladder3

128Longest Consecutive Sequence4 129Sum Root to Leaf Numbers2 130Surrounded Regions4

131Palindrome Partitioning3 132Palindrome Partitioning II4

考频数据结构算法

5array sort

set Two Pointers

4linked list Two Pointers

Math

2string Two Pointers

hashtable

3array Binary Search

2string

1string

3Math

5string Math

2Math

3string Recursion

DP

2array Two Pointers

4Math

4Math

1string

5array Two Pointers

1array Two Pointers

3string DFS

2array

3linked list Two Pointers

5string Stack

5linked list sort

Two Pointers

merge

4string DFS

4linked list sort

heap Two Pointers

merge

4linked list

2linked list Recursion

Two Pointers 3array Two Pointers 4array Two Pointers 5string Two Pointers

KMP

rolling hash 3Binary Search

Math

1string Two Pointers 2array permutation 1string DP

3array Binary Search 3array Binary Search 2array

2array

2array DFS

2string Two Pointers 3array combination 2array combination 2array sort

2array Two Pointers

Stack

3string Two Pointers

Math

3string Recursion

DP

greedy

2array

4array permutation 2array permutation 2array

4string

hashtable

5Binary Search

Math

3array DFS

3array DFS

3array DP

2array

5array sort

linked list merge

red-black tree

5array sort

linked list merge

red-black tree

1string

2array

1permutation

Math

2linked list Two Pointers 3array DP

3array DP

3array DP

5string Math

2array Math

4string Two Pointers

Math

2string

4Binary Search 5DP

1string Stack

3string DP

3array Binary Search 2array sort

Two Pointers 2string Two Pointers 4combination 4array Recursion

combination 4array DFS

2array Two Pointers 3array Binary Search 3linked list Recursion

Two Pointers 3linked list

2array Stack

1array DP

Stack

3linked list Two Pointers 2string Recursion

DP

5array Two Pointers

merge

2combination 2array Recursion

combination 4string Recursion

DP

2linked list Two Pointers 3string DFS

3tree Recursion hashtable morris

Stack

1tree DP

DFS

1tree DP

2string Recursion

DP

5tree DFS

2tree DFS

1tree DFS

2tree DFS

4tree BFS

3queue BFS

tree Stack

1tree DFS

3array DFS

tree

3array DFS

tree

1tree BFS

3tree DFS

3linked list Recursion

Two Pointers 2tree DFS

1tree DFS

3tree DFS

2tree DFS

3tree Recursion

Stack

2string DP

3tree DFS

2tree DFS

1array

1array

1array DP

1array DP

1array greedy

1array DP

2tree DFS

5string Two Pointers 1

5graph BFS

shortest path 3array

4tree DFS

3array BFS

DFS

4string DFS

3string DP