[LeetCode] Binary Tree Paths
Binary Tree Paths
Given a binary tree, return all root-to-leaf paths.
For example, given the following binary tree:
1 / \ 2 3 \ 5
All root-to-leaf paths are:
["1->2->5", "1->3"]
Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.
解题思路：
这道题题意是返回二叉树中所有从根到叶的路径。用递归法做比较方便。
/**
* 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:
vector binaryTreePaths(TreeNode* root) {
vector result;
helper(root, "", result);
return result;
}
void helper(TreeNode* root, string item, vector& result){
if(root==NULL){
return;
}
item = item+std::to_string(root->val);
if(root->left!=NULL){
helper(root->left, item + "->", result);
}
if(root->right!=NULL){
helper(root->right, item + "->", result);
}
if(root->left==NULL&&root->right==NULL){
result.push_back(item);
}
}
};
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