void LeftRotate(Node*& pRoot){
	Node* p = pRoot->right;
	pRoot->right = p->left;
	p->left = pRoot;
	pRoot = p;
}

void RightRotate(Node*& pRoot){
	Node* p = pRoot->left;
	pRoot->left = p->right;
	p->right = pRoot;
	pRoot = p;
}

void Insert(Node*& pRoot, int x){
	//Insert
	if(pRoot == NULL)
		pRoot = creatNode(x);
	if(pRoot->key > x)
		Insert(pRoot->left, x);
	if(pRoot->key > x)
		Insert(pRoot->right, x);

	//Balance
	x = height(pRoot->left)  - height(pRoot->right);

	if(x >= 2){
		if(height(pRoot->left->left) > height(pRoot->left->right))
			RightRotate(pRoot); // MCB Trái Trái
		if(height(pRoot->left->left) < height(pRoot->left->right)){
			LeftRotate(pRoot->left);		//MCB Trái Phải
			RightRotate(pRoot);
	}
	if(x<=-2){ //MCB