https://leetcode.com/problems/binary-tree-paths/
/**
* 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<string> binaryTreePaths(TreeNode* root) {
if(root==NULL)
return res;
string temp=to_string(root->val);
if(root->left==NULL&&root->right==NULL)
res.push_back(temp);
if(root->left!=NULL)
work(root->left,temp);
if(root->right!=NULL)
work(root->right,temp);
return res;
}
vector<string> res;
void work(TreeNode * root,string temp)
{
temp+="->";
temp+=to_string(root->val);
if(root->left==NULL&&root->right==NULL)
{
res.push_back(temp);
}
if(root->left!=NULL)
{
work(root->left,temp);
}
if(root->right!=NULL)
{
work(root->right,temp);
}
}
};