c_cpp all_binary_paths.cpp

Posted 2021-05-14

/**
 * 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> paths;
    void add_paths(TreeNode* root,string s){
        s=s+to_string(root->val);
        if(root->left!=NULL)
        add_paths(root->left,s+"->");
        if(root->right!=NULL)
        add_paths(root->right,s+"->");
        if(root->right==NULL && root->left==NULL)
        paths.push_back(s);
        return ;
    }
    vector<string> binaryTreePaths(TreeNode* root) {
        string s="";
        if(root==NULL)
        return paths;
        add_paths(root,s);
        return paths;
    }
};