计算班级平均分

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	heliangyu	3ms	9 MiB	C++98	255 Bytes	2025-1-18 10:47:39
AC	liuhaoqi	3ms	9 MiB	C++98	208 Bytes	2025-1-18 10:36:33
AC	luyixin	7ms	9.1 MiB	C++98	183 Bytes	2025-5-31 12:12:42
AC	jiangxingxing	7ms	9.1 MiB	C++98	204 Bytes	2025-5-31 12:07:04