31 | Next Permutation | Medium |
32 | Longest Valid Parentheses | Hard |
33 | Search in Rotated Sorted Array | Medium |
34 | Find First and Last Position of Element in Sorted Array | Medium |
34 | Search for a Range | Medium |
35 | Search Insert Position | Easy |
36 | Valid Sudoku | Medium |
37 | Sudoku Solver | Hard |
38 | Count and Say | Easy |
39 | Combination Sum | Medium |
40 | Combination Sum II | Medium |
41 | First Missing Positive | Hard |
42 | Trapping Rain Water | Hard |
43 | Multiply Strings | Medium |
44 | Wildcard Matching | Hard |
45 | Jump Game II | Hard |
46 | Permutations | Medium |
47 | Permutations II | Medium |
48 | Rotate Image | Medium |
49 | Group Anagrams | Medium |
50 | Pow(x, n) | Medium |
51 | N-Queens | Hard |
52 | N-Queens II | Hard |
53 | Maximum Subarray | Easy |
54 | Spiral Matrix | Medium |
55 | Jump Game | Medium |
56 | Merge Intervals | Medium |
57 | Insert Interval | Hard |
58 | Length of Last Word | Easy |
59 | Spiral Matrix II | Medium |