没做过这题 表问我。
by kkksc03 @ 2015-09-17 21:01:06
大坑点：空矩阵也是子矩阵
by 嘒彼小星 @ 2017-09-25 09:39:36
可以考虑没有空矩阵，照样能a
by 违规用户名Gyg#IpM9 @ 2018-10-28 19:56:05
$\sqrt3$考古流明
by XMK_萌新 @ 2021-08-17 15:33:02
考谷
by Gril @ 2022-04-21 21:22:16