练7.2 保留12位小数

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	王浩泽 (zdqz202577)	24ms	540 KiB	C++14(O2)	122 Bytes	2025-12-15 17:18:43
AC	蓝牙 (lqst2554)	25ms	508 KiB	C++14(O2)	158 Bytes	2025-12-18 18:30:20
AC	王钰凯 (lfyst2025022)	25ms	764 KiB	C++14(O2)	109 Bytes	2025-3-26 17:45:35
AC	lfy48	26ms	768 KiB	C++14(O2)	119 Bytes	2025-3-21 18:05:30
AC	邵名慧 (lfyst2025021)	26ms	504 KiB	C++14(O2)	127 Bytes	2025-4-11 18:05:07
AC	周政仰 (lqst2025051)	26ms	508 KiB	C++14(O2)	118 Bytes	2025-4-18 17:21:18
AC	史高睿 (lqst2515)	28ms	532 KiB	C++14(O2)	119 Bytes	2025-12-10 17:39:40
AC	董丞贺 (lfyst2025016)	28ms	768 KiB	C++14(O2)	141 Bytes	2026-2-7 10:18:53