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Wendell Sun edited this page Mar 22, 2021
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| # | Title | Difficulty | Tags | Note |
|---|---|---|---|---|
| 1 | Two Sum | easy | array | |
| 3 | Longest Substring Without Repeating Characters | medium | string | todo |
| 21 | Merge Two Sorted Lists | easy | linked list | |
| 24 | Swap Nodes in Pairs | medium | linked list | |
| 66 | Plus One | medium | array | |
| 92 | Reverse Linked List II | medium | linked list | |
| 101 | Symmetric Tree | easy | tree | |
| 104 | Maximum Depth of Binary Tree | easy | tree | |
| 121 | Best Time to Buy and Sell Stock | easy | ||
| 125 | Valid Palindrome | easy | string | |
| 136 | Single Number | easy | array | |
| 203 | Remove Linked List Elements | easy | linked list | |
| 206 | Reverse Linked List | easy | linked list | |
| 226 | Invert Binary Tree | easy | tree | |
| 263 | Ugly Number | easy |