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Number
Title
Difficulty
Succeeded
Topic Tags
1
Two Sum

Easy

True

2
Add Two Numbers

Medium

True

4
Median of Two Sorted Arrays

Hard

True

5
Longest Palindromic Substring

Medium

True

6
Zigzag Conversion

Medium

False

7
Reverse Integer

Medium

True

8
String to Integer (atoi)

Medium

False

9
Palindrome Number

Easy

True

10
Regular Expression Matching

Hard

True

11
Container With Most Water

Medium

True

12
Integer to Roman

Medium

True

13
Roman to Integer

Easy

True

14
Longest Common Prefix

Easy

True

15
3Sum

Medium

True

16
3Sum Closest

Medium

False

17
Letter Combinations of a Phone Number

Medium

True

18
4Sum

Medium

False

19
Remove Nth Node From End of List

Medium

True

20
Valid Parentheses

Easy

True

21
Merge Two Sorted Lists

Easy

True

22
Generate Parentheses

Medium

True

23
Merge k Sorted Lists

Hard

True

24
Swap Nodes in Pairs

Medium

True

25
Reverse Nodes in k-Group

Hard

True

26
Remove Duplicates from Sorted Array

Easy

True

27
Remove Element

Easy

True

28
Find the Index of the First Occurrence in a String

Medium

True

29
Divide Two Integers

Medium

False

30
Substring with Concatenation of All Words

Hard

True

31
Next Permutation

Medium

False

32
Longest Valid Parentheses

Hard

True

33
Search in Rotated Sorted Array

Medium

True

34
Find First and Last Position of Element in Sorted Array

Medium

True

35
Search Insert Position

Easy

True

36
Valid Sudoku

Medium

False

37
Sudoku Solver

Hard

False

38
Count and Say

Medium

True

39
Combination Sum

Medium

False

40
Combination Sum II

Medium

True

41
First Missing Positive

Hard

False

42
Trapping Rain Water

Hard

True

43
Multiply Strings

Medium

False

44
Wildcard Matching

Hard

True

45
Jump Game II

Medium

True

46
Permutations

Medium

True

47
Permutations II

Medium

True

48
Rotate Image

Medium

True

49
Group Anagrams

Medium

True

50
Pow(x, n)

Medium

False

51
N-Queens

Hard

True

52
N-Queens II

Hard

True

53
Maximum Subarray

Medium

True

54
Spiral Matrix

Medium

True

55
Jump Game

Medium

True

56
Merge Intervals

Medium

True

57
Insert Interval

Medium

False

58
Length of Last Word

Easy

True

59
Spiral Matrix II

Medium

True

60
Permutation Sequence

Hard

True

61
Rotate List

Medium

True

62
Unique Paths

Medium

True

63
Unique Paths II

Medium

True

64
Minimum Path Sum

Medium

True

65
Valid Number

Hard

False

66
Plus One

Easy

True

67
Add Binary

Easy

True

68
Text Justification

Hard

False

69
Sqrt(x)

Easy

True

70
Climbing Stairs

Easy

True

71
Simplify Path

Medium

True

72
Edit Distance

Hard

True

73
Set Matrix Zeroes

Medium

True

74
Search a 2D Matrix

Medium

True

75
Sort Colors

Medium

True

76
Minimum Window Substring

Hard

True

77
Combinations

Medium

False

78
Subsets

Medium

True

79
Word Search

Medium

False

80
Remove Duplicates from Sorted Array II

Medium

False

81
Search in Rotated Sorted Array II

Medium

False

82
Remove Duplicates from Sorted List II

Medium

True

83
Remove Duplicates from Sorted List

Easy

True

84
Largest Rectangle in Histogram

Hard

False

85
Maximal Rectangle

Hard

True

86
Partition List

Medium

True

87
Scramble String

Hard

False

88
Merge Sorted Array

Easy

False

89
Gray Code

Medium

True

90
Subsets II

Medium

True

91
Decode Ways

Medium

False

92
Reverse Linked List II

Medium

False

93
Restore IP Addresses

Medium

True

94
Binary Tree Inorder Traversal

Easy

True

95
Unique Binary Search Trees II

Medium

True

96
Unique Binary Search Trees

Medium

True

97
Interleaving String

Medium

True

98
Validate Binary Search Tree

Medium

True

99
Recover Binary Search Tree

Medium

True

100
Same Tree

Easy

True

101
Symmetric Tree

Easy

False

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