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算法训练/刷题笔记/迭代一.md
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- [ ] [110. 平衡二叉树 - 力扣（LeetCode）](https://leetcode.cn/problems/balanced-binary-tree/solutions/377216/ping-heng-er-cha-shu-by-leetcode-solution/) - [ ] [110. 平衡二叉树 - 力扣（LeetCode）](https://leetcode.cn/problems/balanced-binary-tree/solutions/377216/ping-heng-er-cha-shu-by-leetcode-solution/)
- [ ] [106. 从中序与后序遍历序列构造二叉树 - 力扣（LeetCode）](https://leetcode.cn/problems/construct-binary-tree-from-inorder-and-postorder-traversal/) - [ ] [106. 从中序与后序遍历序列构造二叉树 - 力扣（LeetCode）](https://leetcode.cn/problems/construct-binary-tree-from-inorder-and-postorder-traversal/)
- [ ] [501. 二叉搜索树中的众数 - 力扣（LeetCode）](https://leetcode.cn/problems/find-mode-in-binary-search-tree/) - [ ] [501. 二叉搜索树中的众数 - 力扣（LeetCode）](https://leetcode.cn/problems/find-mode-in-binary-search-tree/)
- [ ] [40. 组合总和 II - 力扣（LeetCode）](https://leetcode.cn/problems/combination-sum-ii/) 重点是结果去重，技巧
1. 先对 candidates 排序，这样就不会出现 `[[1,2,5], [1,5,2]]` 的情况
2. 在每一个 epoch 中，循环时跳过 visited 元素，这样就不会出现 `[[1,2,5], [1,2,5]]` 的情况