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Program.cs
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Program.cs
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using System;
namespace BinaryTreePruning
{
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 TreeNode PruneTree(TreeNode root)
{
return ContainsOne(root) ? root : null;
}
private bool ContainsOne(TreeNode node)
{
if (node == null) return false;
var leftContainsOne = ContainsOne(node.left);
var rightContainsOne = ContainsOne(node.right);
if (!leftContainsOne) node.left = null;
if (!rightContainsOne) node.right = null;
return node.val == 1 || leftContainsOne || rightContainsOne;
}
}
}