保护rcx

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	muse	44ms	540 KiB	C++20(O2)	1.6 KiB	2026-10-26 15:32:50
AC	admin	85ms	448 KiB	C++17	983 Bytes	2026-4-27 12:13:48
AC	262024214300	87ms	416 KiB	C++17	933 Bytes	2026-4-26 17:19:00
AC	abcdefj	87ms	412 KiB	C++17	1.3 KiB	2026-9-24 15:02:20