题解 | #牛群的相似结构#

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 p TreeNode类
     * @param q TreeNode类
     * @return bool布尔型
     */
    public boolean isSameTree (TreeNode p, TreeNode q) {
        String s = searchTree(p);
        String s1 = searchTree(q);
        return s.equals(s1);
    }
    public String searchTree(TreeNode node) {
        if (node == null) {
            return " ";
        }
        String str = "";
        str += node.val;
        String s = searchTree(node.left);
        String s1 = searchTree(node.right);
        return str + s + s1;
    }
}