108. 将有序数组转换为二叉搜索树 https://leetcode.cn/problems/convert-sorted-array-to-binary-search-tree
1382. 将二叉搜索树变平衡 https://leetcode.cn/problems/balance-a-binary-search-tree
449. 序列化和反序列化二叉搜索树 https://leetcode.cn/problems/serialize-and-deserialize-bst
109. 有序链表转换二叉搜索树 https://leetcode.cn/problems/convert-sorted-list-to-binary-search-tree
173. 二叉搜索树迭代器 https://leetcode.cn/problems/binary-search-tree-iterator
1305. 两棵二叉搜索树中的所有元素 https://leetcode.cn/problems/all-elements-in-two-binary-search-trees