规则Rules：
标准数独基础上，如果某一行/列第一格是X，则提示表示这一方向上前X格中最大的数字。
Classic rules applied. Additionally, if X is the first number of a Row or Column, the clue indicates the largest number of the first X cells on this direction.
◆在线做Do it by CTC
◆在线做Do it by Penpa
