😊1.题目

尝试一下该题

😉2.解法

/*** Definition for a binary tree node.* struct TreeNode {*     int val;*     struct TreeNode *left;*     struct TreeNode *right;* };*/
bool isSameTree(struct TreeNode* p,struct TreeNode* q)
{if(p == NULL || q == NULL)return p == q;return p->val == q->val && isSameTree(p->left,q->right) && isSameTree(q->left,p->right);
}
bool isSymmetric(struct TreeNode* root) {return isSameTree(root->left,root->right);
}