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Program.cs
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Program.cs
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using System;
using System.Collections.Generic;
namespace SumOfRootToLeafBinaryNumbers
{
public class TreeNode
{
public int val;
public TreeNode left;
public TreeNode right;
public TreeNode(int val = 0, TreeNode left = null, TreeNode right = null)
{
this.val = val;
this.left = left;
this.right = right;
}
}
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
public int SumRootToLeaf(TreeNode root)
{
int sum = 0;
GetNum(root, 0, ref sum);
return sum;
}
private void GetNum(TreeNode node, int num, ref int sum)
{
if(node == null)
return;
num <<= 1;
num += node.val;
if (node.left == null && node.right == null)
sum += num;
GetNum(node.left, num, ref sum);
GetNum(node.right, num, ref sum);
num -= node.val;
num >>= 1;
}
}
}