题目地址(235. 二叉搜索树的最近公共祖先 - 力扣（LeetCode）)

https://leetcode.cn/problems/lowest-common-ancestor-of-a-binary-search-tree/description/

题目地址(236. 二叉树的最近公共祖先 - 力扣（LeetCode）)

https://leetcode.cn/problems/lowest-common-ancestor-of-a-binary-tree/description/

题目地址(450. 删除二叉搜索树中的节点 - 力扣（LeetCode）)

https://leetcode.cn/problems/delete-node-in-a-bst/description/

题目地址(701. 二叉搜索树中的插入操作 - 力扣（LeetCode）)

https://leetcode.cn/problems/insert-into-a-binary-search-tree/description/

题目地址(501. 二叉搜索树中的众数 - 力扣（LeetCode）)

https://leetcode.cn/problems/find-mode-in-binary-search-tree/description/

题目地址(530. 二叉搜索树的最小绝对差 - 力扣（LeetCode）)

https://leetcode.cn/problems/minimum-absolute-difference-in-bst/description/

题目地址(617. 合并二叉树 - 力扣（LeetCode）)

https://leetcode.cn/problems/merge-two-binary-trees/description/

题目地址(700. 二叉搜索树中的搜索 - 力扣（LeetCode）)

https://leetcode.cn/problems/search-in-a-binary-search-tree/submissions/550317560/

题目地址(98. 验证二叉搜索树 - 力扣（LeetCode）)

https://leetcode.cn/problems/validate-binary-search-tree/description/

题目地址(101. 对称二叉树 - 力扣（LeetCode）)

https://leetcode.cn/problems/symmetric-tree/description/