bool Symmetric(BinNode *left,BinNode *right){
if(left == NULL && right == NULL) return true;
else if(left != NULL && right != NULL){
return (left->data == right->data && Symmetric(left->lchild,right->rchild) && Symmetric(left->rchild,right->lchild));
}else{
return false;
}
}
Group Group::symmetric(int n) {return Group(Symmetric(n)); }
bool IsSymmetricTree(BinTree r){
if (r == NULL) return false;
return Symmetric(r->lchild,r->rchild);
}