Leetcode 100 Same Tree

Given two binary trees, write a function to check if they are equal or not.

Two binary trees are considered equal if they are structurally identical and the nodes have the same value.

判断两棵二叉树是否一样。

简单，不多说了。

/** * Definition for a binary tree node. * 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 || !q)        {            if(!p && !q) return true;            return false;        }        if(p->val!=q->val) return false;        return isSameTree(p->left,q->left) && isSameTree(p->right,q->right);    }};