@[Nt_Yester](/user/420129) `(i-1)*m+j%2`改为`(i+j)%2`。
by N1008_9 @ 2022-10-27 08:23:16
当 $m$ 为偶数时显然不对。
by N1008_9 @ 2022-10-27 08:23:59
@[__traingle](/user/851032) 谢谢
by Nt_Tsumiki @ 2022-10-27 08:24:47