《算法导论》笔记3-13

left_rotate(T, root)
	rChild = root.right
	root.right = rChild.left
	if rChild.left != T.null
		rChild.left.parent = root
	rChild.parent = root.parent
	if root.parent == T.null
		T.root = rChild
	elif root == root.parent.left
		root.parent.left = rChild
	else
		root.parent.right = rChild
	rChild.left = root
	root.parent = rChild