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leetcode - Binary Tree Preorder Traversal

2013-11-10 10:58  张汉生  阅读(150)  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 preOr(TreeNode * node, vector<int> & rlt){
13         if (node==NULL)
14         return;
15         rlt.push_back(node->val);
16         preOr(node->left,rlt);
17         preOr(node->right,rlt);
18     }
19     vector<int> preorderTraversal(TreeNode *root) {
20         // IMPORTANT: Please reset any member data you declared, as
21         // the same Solution instance will be reused for each test case.
22         vector<int> rlt;
23         preOr(root, rlt);
24         return rlt;
25     }
26 };