序号 题目 备注
    2022/2/25 N=3 (13)

    - [x]

    | 17 | 电话号码的字母组合 | 不用回溯直接穷举 | |
    - [x]

    | 22 | 括号生成 | DFS回溯（?） | |
    - [x]

    | 37 | 解数独 | 对于空格子进行遍历，失败则回退到上一个，注意需要清空尝试失败的格子 | | 2022/2/26 N=3 | | | | |
    - [x]

    | 39 | 组合总和 | 排序后好像更慢了、、 | |
    - [x]

    | 40 | 组和总和 II | 最快到达50%左右 | |
    - [x]

    | 46 | 全排列 | 插入法 | |
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