去掉最高最低分后的平均分

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	ymhxxyz	6ms	388 KiB	C++98	434 Bytes	2025-8-29 14:09:34
AC	秦鹏越	6ms	384 KiB	C++14	288 Bytes	2025-7-15 19:34:13
AC	杜若铭	6ms	384 KiB	C++14	487 Bytes	2025-8-26 9:54:59
AC	周圣博	6ms	416 KiB	C++14(O2)	320 Bytes	2025-7-31 10:57:36
AC	王承佑	6ms	376 KiB	C++14(O2)	370 Bytes	2025-7-15 11:42:56
AC	lishuxi	6ms	504 KiB	C++17(O2)	368 Bytes	2025-8-14 10:17:57
AC	张尚	6ms	380 KiB	C++14(O2)	419 Bytes	2025-7-15 11:01:19
AC	王瑜	6ms	376 KiB	C++14(O2)	323 Bytes	2025-7-15 11:17:29
AC	MrLee	7ms	380 KiB	C++14	266 Bytes	2025-7-15 8:20:06