LeetCode Same Tree

题目

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.

 

比较两棵树是否相同，递归求解即可。

 

代码：

/**
 * 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&&p->val==q->val)	//递归调用
			if(isSameTree(p->left,q->left)&&isSameTree(p->right,q->right))
				return true;
		return false;
    }
};