Same Tree

SameTree.java

/*
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.


 * Definition for binary tree
 * 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) ||p.val != q.val) {
            return false;
        }   
        return isSameTree(p.left,q.left) && isSameTree(p.right, q.right);
    }
}