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21 lines
537 B
C
21 lines
537 B
C
/**
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* Definition for a binary tree node.
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* struct TreeNode {
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* int val;
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* struct TreeNode *left;
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* struct TreeNode *right;
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* };
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*/
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bool checkSymmetric(struct TreeNode *left, struct TreeNode *right) {
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if (!left || !right)
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return left == right;
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if (left->val != right->val)
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return 0;
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return checkSymmetric(left->left, right->right) && checkSymmetric(left->right, right->left);
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}
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bool isSymmetric(struct TreeNode* root){
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return root == NULL || checkSymmetric(root->left, root->right);
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}
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