题解 | #判断t1树中是否有与t2树完全相同的子树#

using System;
using System.Collections.Generic;

/*
public class TreeNode
{
    public int val;
    public TreeNode left;
    public TreeNode right;

    public TreeNode (int x)
    {
        val = x;
    }
}
*/

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 bool isContains (TreeNode root1, TreeNode root2) {
        // write code here
        if (root1 == null && root2 == null)
            return true;
        if (root1 == null || root2 == null)
            return false;
        if (root1.val.Equals(root2.val))
            return isSame(root1, root2);
        return isContains(root1.left, root2) || isContains(root1.right, root2);
    }

    public bool isSame (TreeNode root1, TreeNode root2) {
        // write code here
        if (root1 == null && root2 == null)
            return true;
        if (root1 == null || root2 == null)
            return false;
        if (!root1.val.Equals(root2.val))
            return false;
        return isContains(root1.left, root2.left) &&
                    isContains(root1.right, root2.right);
    }
}