题解 | #相同的二叉树#

import java.util.*;

/*
 * public class TreeNode {
 *   int val = 0;
 *   TreeNode left = null;
 *   TreeNode right = null;
 *   public TreeNode(int val) {
 *     this.val = val;
 *   }
 * }
 */

public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param root1 TreeNode类 
     * @param root2 TreeNode类 
     * @return bool布尔型
     */
    public boolean isSameTree(TreeNode root1, TreeNode root2) {
        // write code here
        if ((null == root1 && null != root2) || (null != root1 && null == root2)) {
            return false;
        }
        if (null == root1 && null == root2) {
            return true;
        }
        if (root1.val != root2.val) {
            return false;
        }
        return isSameTree(root1.left, root2.left) && isSameTree(root1.right, root2.right);
    }
}