100. Same Tree

100 [Same Tree]
(https://leetcode.com/problems/same-tree/submissions/)

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.

/**


Total Accepted: **130153** Total Submissions: **299759** Difficulty: **Easy**



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 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
public class Solution {
    public boolean isSameTree(TreeNode p, TreeNode q) {

        if (p == null && q == null) {
            return true;
        } 
        if (p == null || q == null) {
            return false;
        }
        
        if (p.val == q.val) {
               return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
         }
        
        return false;
    }
}