[leetcode] 11. Same Tree
因为我刷题是难度不是按发布日期,所以就有可能遇到这种情况,比如这个。。。
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.
这道题跟之前那道是递进的,而且这道在前,先用它学会怎么判断二叉树相等,然后再去做那道镜像判断。但是呢,我是先把镜像撸出来了,所以这道题就是把之前的题解里面那个子函数拉出来就行。
题解如下:
/** * 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; } return p->val == q->val && isSameTree(p->left, q->left) && isSameTree(p->right, q->right); } };
就是这样。