is Same tree -

isSameTree1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace sameTree_fCodeLab
{
    /*
     * Given two binary trees, write a function to check if they are equal or not.

Two binary trees are considered equal if they are structurally identical and the nodes have the same value.

Return 0 / 1 ( 0 for false, 1 for true ) for this problem

Example :

Input : 

   1       1
  / \     / \
 2   3   2   3

Output : 
  1 or True
     */

    class TreeNode
    {
        public int val;
        public TreeNode left;
        public TreeNode right;

        public TreeNode(int x)
        {
            val = x;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
        }

        public static int isSameTree(TreeNode a, TreeNode b)
        {
            if (a == null && b == null)
                return 1;
            if (a == null)
                return 0;
            if (b == null)
                return 0;

            if (a.val != b.val)
                return 0;

            return isSameTree(a.left, b.left) & isSameTree(a.right, b.right);

        }
    }    
}