练20.3 开灯关灯

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	沈锦程	3ms	504 KiB	C++14	154 Bytes	2025-6-4 17:19:49
AC	杨丛恺	3ms	504 KiB	C++14	88 Bytes	2025-6-4 18:03:57
AC	小赵老师	3ms	504 KiB	C++14	86 Bytes	2025-6-4 17:18:28
AC	桑语禅	3ms	504 KiB	C++14	83 Bytes	2025-6-4 17:19:47