package leetcode import ( "github.com/halfrost/LeetCode-Go/structures" ) // TreeNode define type TreeNode = structures.TreeNode /** * Definition for a binary tree node. * type TreeNode struct { * Val int * Left *TreeNode * Right *TreeNode * } */ func sumNumbers(root *TreeNode) int { res := 0 dfs(root, 0, &res) return res } func dfs(root *TreeNode, sum int, res *int) { if root == nil { return } sum = sum*10 + root.Val if root.Left == nil && root.Right == nil { *res += sum return } dfs(root.Left, sum, res) dfs(root.Right, sum, res) }