输出保留 12 位小数的浮点数

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	summer23041	31ms	808 KiB	C++17	133 Bytes	2023-10-5 16:15:49
AC	BC20260028	31ms	812 KiB	C++11	171 Bytes	2023-11-24 16:30:37
AC	BC20260311	31ms	808 KiB	C++17	194 Bytes	2023-12-19 16:45:39
AC	BC20260349	31ms	808 KiB	C++17(O2)	119 Bytes	2023-10-20 22:22:52
AC	CC20260191	31ms	808 KiB	C++17(O2)	133 Bytes	2023-10-6 11:53:38
AC	CC20260060	31ms	732 KiB	C++11	120 Bytes	2023-11-12 8:09:41
AC	C20250069	32ms	768 KiB	C++11(O2)	179 Bytes	2023-10-15 12:39:07
AC	BC20260085	32ms	820 KiB	C++11	119 Bytes	2023-11-24 17:07:28
AC	BC20260023	32ms	728 KiB	C++11	109 Bytes	2023-12-5 15:17:31
AC	chenyu2024	39ms	816 KiB	C++98	163 Bytes	2024-9-27 10:14:00
AC	C20250070	40ms	804 KiB	C++17(O2)	139 Bytes	2024-5-18 11:19:39
AC	BC20260030	41ms	808 KiB	C++17(O2)	118 Bytes	2024-4-11 19:53:28
AC	BC20260080	41ms	852 KiB	C++17(O2)	141 Bytes	2024-4-3 23:52:29
AC	BC20260087	41ms	808 KiB	C++17(O2)	120 Bytes	2024-4-8 15:20:07
AC	BC20260002	43ms	764 KiB	C++17	194 Bytes	2024-5-13 12:14:31
AC	BC20260087	44ms	804 KiB	C++17(O2)	120 Bytes	2024-4-8 15:19:54