矩阵指定行求和

Status	Submit By	Time	Memory	Code	Submit At
AC	AWM	20ms	6.8 MiB	324 Bytes	2023-6-22 13:38:12
AC	丁鲲龙	20ms	6.8 MiB	343 Bytes	2023-6-23 21:15:12
AC	曹雅萱	20ms	6.8 MiB	467 Bytes	2023-6-23 19:14:47
AC	贾博涵	20ms	6.8 MiB	360 Bytes	2023-6-23 11:15:46
AC	李旻轩	21ms	7.1 MiB	486 Bytes	2023-6-17 10:34:01
AC	李睿瞳	21ms	6.8 MiB	368 Bytes	2023-6-22 12:05:41
AC	wby	21ms	6.8 MiB	321 Bytes	2023-6-23 11:25:06
AC	sky	22ms	6.9 MiB	619 Bytes	2023-6-17 10:15:56
AC	谢润轩	22ms	7 MiB	471 Bytes	2023-6-17 11:49:29