leetcode: Minimum Depth of Binary Tree
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必须是到叶节点
/** * Definition for binary tree * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */class Solution {public: int minDepth(TreeNode *root) { if( root == NULL) return 0; if( root->left && root->right) return min( minDepth( root->left), minDepth( root->right)) + 1; else if( root->left) return minDepth( root->left) + 1; else if( root->right) return minDepth( root->right) + 1; else return 1; }}; 0 0
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