Same Tree

https://leetcode.com/problems/same-tree/

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.

 1 /**
 2  * Definition for a binary tree node.
 3  * public class TreeNode {
 4  *     int val;
 5  *     TreeNode left;
 6  *     TreeNode right;
 7  *     TreeNode(int x) { val = x; }
 8  * }
 9  */
10 public class Solution {
11     public static boolean isSameTree(TreeNode p, TreeNode q) {
12     if(p==null&&q==null) return true;
13     if(p==null||q==null) return false;
14     if(p.val==q.val)
15         return(isSameTree(p.left, q.left)&&isSameTree(p.right, q.right));
16     return false;
17     }
18 }