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leetcode - Sum Root to Leaf Numbers

2013-11-06 09:25  张汉生  阅读(144)  评论(0)    收藏  举报

 

 1 /**
 2  * Definition for binary tree
 3  * struct TreeNode {
 4  *     int val;
 5  *     TreeNode *left;
 6  *     TreeNode *right;
 7  *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 8  * };
 9  */
10 class Solution {
11 public:
12     void sumNumbers(TreeNode *node, int &totalSum, int curSum){
13         curSum = curSum *10 + node->val;
14         if (node->left==NULL && node->right==NULL){
15             totalSum += curSum;
16             return;
17         }
18         if (node->left != NULL)
19             sumNumbers(node->left, totalSum, curSum);
20         if (node->right != NULL)
21             sumNumbers(node->right, totalSum, curSum);
22     }
23     int sumNumbers(TreeNode *root) {
24         // IMPORTANT: Please reset any member data you declared, as
25         // the same Solution instance will be reused for each test case.
26         if (root==NULL)
27             return 0;
28         int sum = 0;
29         sumNumbers(root, sum, 0);
30         return sum;
31     }
32 };