LeetCode 235 Lowest Common Ancestor of a Binary Search Tree

洲行

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2022-10-18

​​题目​​

题意:判断BST中两个节点的最近的公共父节点

题解:递归的时候判断如果两个节点的值在父节点两边,那个这个父节点就是最近的公共父节点。否则按照二叉搜索树的规则递归下去。

/**
* Definition for a binary tree node.
* struct TreeNode {
* int val;
* TreeNode *left;
* TreeNode *right;
* TreeNode(int x) : val(x), left(NULL), right(NULL) {}
* };
*/
class Solution {
public:
TreeNode* lowestCommonAncestor(TreeNode* root, TreeNode* p, TreeNode* q) {



if(p->val<=root->val&&q->val>=root->val)
return root;
if(p->val>=root->val&&q->val<=root->val)
return root;

if(p->val<root->val&&q->val<root->val)
return lowestCommonAncestor(root->left,p,q);

return lowestCommonAncestor(root->right,p,q);
}
};



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