LeetcodeProblem/Q100.java at master · gshuoycode/LeetcodeProblem · GitHub

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/*
* @Author: Shawn Yang
* @Date:   2019-09-12 01:25:40
* @Last Modified by:   Shawn Yang
* @Last Modified time: 2019-09-12 01:25:49
*/
/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
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 != null && q == null) {
            return false;
        } else {
            if(p.val != q.val) {
                return false;
            } else {
                return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
            }
        }
    }
}