计算并联电阻的阻值

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	ALT_chejunhao	20ms	20.4 MiB	C++14	160 Bytes	2026-9-13 11:18:28
AC	ALT_zhangzixuan	20ms	20.4 MiB	C++14	167 Bytes	2026-9-20 12:38:37
AC	ALT_sunshuoran	21ms	20.4 MiB	C++14	150 Bytes	2026-9-5 17:50:04
AC	admin	21ms	20.4 MiB	C++14	215 Bytes	2026-8-28 15:30:37
AC	ALT_lihaoang	21ms	20.4 MiB	C++14	213 Bytes	2026-10-17 21:45:43
AC	ALT_cuiminglei	21ms	20.4 MiB	C++14	145 Bytes	2026-10-10 23:49:20
AC	ALT_xizhanxuan	22ms	20.4 MiB	C++14	198 Bytes	2026-9-7 15:59:23