LeetCode OJ--Same Tree

https://oj.leetcode.com/problems/same-tree/

判断两个二叉树，是否相等。

深搜

/**
 * Definition for binary tree
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */
class Solution {
public:
    bool isSameTree(TreeNode *p, TreeNode *q) {
        if(p == NULL && q == NULL)
            return true;
        if(p == NULL || q == NULL)
            return false;

        if(p->val != q->val)
            return false;

        bool ret = isSameTree(p->left,q->left);
        if(ret == false)
            return false;

        bool ret2 = isSameTree(p->right,q->right);
        if(ret2 == false)
            return false;

        return true;
    }
};