LeetCode/101.cpp at master · guihunkun/LeetCode · GitHub

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/**
 * 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==NULL)
            return true;
        return isSymmetric(root->left,root->right);
    }
    bool isSymmetric(TreeNode* left,TreeNode* right)
    {
        if(left==NULL && right==NULL)
            return true;
        if(left==NULL || right==NULL)
            return false;
        if(left->val!=right->val)
            return false;
        return (isSymmetric(left->left,right->right) && isSymmetric(left->right,right->left) );
    }
};