1 | To lower case | Easy |
2 | Anagrams | Easy |
3 | Compare strings | Easy |
4 | Reverse string | Easy |
5 | Reverse words | Easy |
6 | Kth smallest node in a binary search tree | Medium |
7 | Reverse words 2 | Easy |
8 | Contains duplicate | Easy |
9 | Same tree | Easy |
10 | Reverse integer | Easy |
11 | Hamming weight | Easy |
12 | Missing number | Easy |
13 | Maximum subarray | Easy |
14 | Merge sorted lists | Hard |
15 | Unique number | Easy |
16 | First unique character | Easy |
17 | Longest common prefix | Easy |
18 | Valid palindrome | Easy |
19 | Valid parentheses | Easy |
20 | Majority item | Easy |
21 | Find difference | Easy |
22 | Detect capital | Easy |
23 | Excel sheet column number | Easy |
24 | Count bits | Medium |
25 | Reverse bits | Easy |
26 | Linked list cycle | Easy |
27 | Climb stairs | Easy |
28 | Arrays intersection | Easy |
29 | Largest Number | Medium |
30 | Subarrays of sum K | Medium |
31 | Find array duplicates | Medium |
32 | Arrays intersection 2 | Easy |
33 | Longest continuous increasing subsequence | Easy |
34 | Longest increasing subsequence | Medium |
35 | Maximum average subarray | Easy |
36 | Add one | Easy |
37 | Smallest subarray | Medium |
38 | Hamming distance | Easy |
39 | Jewels and stones | Easy |
40 | Longest substring without repeating | Medium |
41 | Sum of the left leaves | Easy |
42 | Symmetric tree | Easy |
43 | Invert binary tree | Easy |
44 | Maximum depth of a binary tree | Easy |
45 | Minimum depth of a binary tree | Easy |
46 | Averages of levels in a binary tree | Easy |
47 | Level order traversal of a binary tree | Easy |
48 | Balanced binary tree | Easy |
49 | Binary tree path sum | Easy |
50 | Binary tree sum numbers | Medium |