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