练7.2 保留12位小数

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	C23liukaiyan	23ms	764 KiB	C++11	124 Bytes	2023-11-22 16:52:29
AC	C23huangyuran	26ms	764 KiB	C++17	893 Bytes	2023-10-22 20:41:24
AC	C23fengrui	26ms	764 KiB	C++17(O2)	146 Bytes	2023-9-23 10:04:33
AC	C23liupeilin	26ms	768 KiB	C++11	135 Bytes	2023-12-19 20:57:30
AC	C23pengweixuan	27ms	540 KiB	C++11	139 Bytes	2024-4-6 15:54:16
AC	C24zhengshunyuan	27ms	540 KiB	C++11	131 Bytes	2024-12-12 13:19:17
AC	C23chenxinglin	28ms	764 KiB	C++11	128 Bytes	2024-1-22 21:05:41