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Sainnhe Park 2023-02-01 10:45:58 +08:00
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#ifndef S0235_LOWEST_COMMON_ANCESTOR_OF_A_BINARY_SEARCH_TREE_HPP
#define S0235_LOWEST_COMMON_ANCESTOR_OF_A_BINARY_SEARCH_TREE_HPP
#include "structures.hpp"
class S0235 {
public:
TreeNode* lowestCommonAncestor(TreeNode* root, TreeNode* p, TreeNode* q);
};
#endif

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- [理论基础](./btree_basic.md)
- [遍历](./btree_iter.md)
- [二叉搜索树](./bstree.md)
# STL

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notes/src/bstree.md Normal file
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# 二叉搜索树
- [s0235](https://leetcode.cn/problems/lowest-common-ancestor-of-a-binary-search-tree/description/): 找两个指定节点的最近公共祖先。思路很简单,只要出现分岔(即一个在当前节点的左边,一个在当前节点的右边),那么这个分岔点就是最近公共祖先。

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#include "s0235_lowest_common_ancestor_of_a_binary_search_tree.hpp"
TreeNode* S0235::lowestCommonAncestor(TreeNode* root, TreeNode* p,
TreeNode* q) {
TreeNode* result = root;
while (!((p->val <= result->val && q->val >= result->val) ||
(q->val <= result->val && p->val >= result->val))) {
if (p->val < result->val) {
result = result->left;
} else {
result = result->right;
}
}
return result;
}