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用前中后序遍历二叉树
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## 二叉搜索树
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> Binary Search Tree
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left (包括其后代) value <= root value
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right (包括其后代) value >= root value
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### 求二叉搜索树的第 K 小值
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## 平衡二叉搜索树
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## 红黑树 / 自平衡二叉搜索树
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>通过颜色转换来维持树的平衡
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