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Program.cs
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Program.cs
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using System;
namespace TwoSumBSTs
{
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!");
}
static bool TwoSumBSTs(TreeNode root1, TreeNode root2, int target)
{
if (root1 == null || root2 == null) return false;
return DFS(root1, root2.val, target) || TwoSumBSTs(root1, root2.left, target) || TwoSumBSTs(root1, root2.right, target);
}
static bool DFS(TreeNode root1, int val, int target)
{
if (root1 == null) return false;
if (root1.val + val == target) return true;
if (root1.val + val > target) return DFS(root1.left, val, target);
return DFS(root1.right, val, target);
}
}
}