/**
* 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 isSymmetric(TreeNode* root) {
if(!root) return true;
return helper(root->right, root->left);
}
bool helper(TreeNode* left, TreeNode* right){
if(!left && !right) return true;
if(!left || !right || left->val!=right->val) return false;
return helper(left->left, right->right)&&helper(left->right, right->left);
}
};
LeetCode - Symmetric Tree
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转载自blog.csdn.net/real_lisa/article/details/83049676
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