100.same-tree.java

/*
 * @lc app=leetcode id=100 lang=java
 *
 * [100] Same Tree
 */
/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
//why so easy?????
class Solution {
    public boolean isSameTree(TreeNode p, TreeNode q) {
        if(p == null && q == null) {
            return true;
        }
        else if(p == null || q == null) {
            return false;
        }
        else {
            if(p.val == q.val) {
                return isSameTree(p.left, q.left)&&isSameTree(p.right, q.right);
            }
            else {
                return false;
            }
        }
    }
}