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  • leetcode[129]Sum Root to Leaf Numbers

    Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number.

    An example is the root-to-leaf path 1->2->3 which represents the number 123.

    Find the total sum of all root-to-leaf numbers.

    For example,

        1
       / 
      2   3
    

    The root-to-leaf path 1->2 represents the number 12.
    The root-to-leaf path 1->3 represents the number 13.

    Return the sum = 12 + 13 = 25.

    /**
     * Definition for binary tree
     * struct TreeNode {
     *     int val;
     *     TreeNode *left;
     *     TreeNode *right;
     *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
     * };
     */
    class Solution {
    public:
    void dfs(int &sum, int num, TreeNode *root)
    {
        if(root==NULL)return;
        num+=root->val;
        if(root->left==NULL&&root->right==NULL)
        {
            sum+=num;
            return;
        }
        if(root->left)dfs(sum, 10*num, root->left);
        if(root->right)dfs(sum, 10*num, root->right);
    }
        int sumNumbers(TreeNode *root) {
            int sum=0;
            int num=0;
            dfs(sum, num, root);
            return sum;
        }
    };
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  • 原文地址:https://www.cnblogs.com/Vae1990Silence/p/4281262.html
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