/*
struct TreeNode {
int val;
struct TreeNode *left;
struct TreeNode *right;
TreeNode(int x) :
val(x), left(NULL), right(NULL) {
}
};
*/
class Solution {
public:
bool isSymmetrical(TreeNode* pRoot) {
return isSymmetrical(pRoot, pRoot);
}
bool isSymmetrical(TreeNode* pRoot1, TreeNode* pRoot2) {
if (pRoot1 == nullptr && pRoot2 == nullptr) return true;
if (pRoot1 == nullptr || pRoot2 == nullptr) return false;
if (pRoot1->val != pRoot2->val) return false;
return isSymmetrical(pRoot1->left, pRoot2->right) && isSymmetrical(pRoot1->right, pRoot2->left);
}
}; 
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