- 重建二叉树 -> https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/
- √矩阵中的路径 -> https://leetcode.com/problems/word-search/
- 机器人的运动范围 -> 没找到
- 剪绳子(dp) -> 没找到
- √二进制中1的个数 -> https://leetcode.com/problems/number-of-1-bits/ ->(升级版)https://leetcode.com/problems/counting-bits/
- √数值的整数次方(溢出) -> https://leetcode.com/problems/powx-n/