规则Rules：
标准数独基础上，如果箭头格是X，箭头方向第X格和箭头格有同样的奇偶性。
Classic rules applied. Additionally, if the arrow cell is X, the Xth cell on this direction owns same parity with this cell.
作者Author：风车（Air）
◆在线涂鸦 Draw it Online
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
