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docs(README): 补充二叉树专题
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README.md

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@@ -80,5 +80,19 @@ LeetCode 刷题小组,组织代号 *Punch*,缘起我的 LeetCode 解题本 [
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- [155. 最小栈](https://leetcode-cn.com/problems/min-stack/):包含 Min 函数的栈(只让比栈顶小的元素入栈)
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- [739. 每日温度](https://leetcode-cn.com/problems/daily-temperatures/):单调栈、递减栈
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- [946. 验证栈序列](https://leetcode-cn.com/problems/validate-stack-sequences/):求出栈数目和出栈序列
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- 树相关:
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- [331. 验证二叉树的前序序列化](https://leetcode-cn.com/problems/verify-preorder-serialization-of-a-binary-tree/)
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- [331. 验证二叉树的前序序列化](https://leetcode-cn.com/problems/verify-preorder-serialization-of-a-binary-tree/):树相关
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- [133. 克隆图](https://leetcode-cn.com/problems/clone-graph/):栈与深搜 + 队列与广搜
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- [341. 扁平化嵌套列表迭代器](https://leetcode-cn.com/problems/flatten-nested-list-iterator/):递归或栈
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- [933. 最近的请求次数](https://leetcode-cn.com/problems/number-of-recent-calls/):队列应用
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## 第三期:树
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### 二叉树
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- [144. 二叉树的前序遍历](https://leetcode-cn.com/problems/binary-tree-preorder-traversal/):递归/迭代(栈模拟)
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- [94. 二叉树的中序遍历](https://leetcode-cn.com/problems/binary-tree-inorder-traversal/):递归/迭代(栈模拟)
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- [145. 二叉树的后序遍历](https://leetcode-cn.com/problems/binary-tree-postorder-traversal/):递归/迭代(栈 + 反序)
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- 👍[102. 二叉树的层次遍历](https://leetcode-cn.com/problems/binary-tree-level-order-traversal/):队列
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- [104. 二叉树的最大深度](https://leetcode-cn.com/problems/maximum-depth-of-binary-tree/description/):自底向上/自顶向下
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- [101. 对称二叉树](https://leetcode-cn.com/problems/symmetric-tree/):递归/迭代(队列,层级遍历)
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- [112. 路径总和](https://leetcode-cn.com/problems/path-sum/):递归

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