112. Path Sum

problem

112. Path Sum

 code

回归方法

/**
 * 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:
    bool hasPathSum(TreeNode* root, int sum) {
        if(root==NULL) return false;
        if( (root->val==sum)&&(root->left==NULL)&&(root->right==NULL) ) return true;//
        return (hasPathSum(root->left, sum-root->val) || hasPathSum(root->right, sum-root->val));
        
    }
};

 参考

1.leetcode_Path Sum;

 完