leetcode 236 Lowest Common Ancestor of a Binary Tree
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/** * 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(!root||root==p||root==q) { return root; } TreeNode* left=lowestCommonAncestor(root->left,p,q); TreeNode* right=lowestCommonAncestor(root->right,p,q); if(left&&right) { return root; } else { return left==NULL?right:left; } }};阅读全文
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