加一减一乘二 / +1-1x2

状态	递交者	时间	内存	语言	代码	递交时间
AC	R_if_CX	40ms	424 KiB	C++14[O2]	433 Bytes	2026-8-15 11:04:14
AC	Wang_Ziyi	42ms	420 KiB	C++14[O2]	346 Bytes	2026-8-14 20:09:07
AC	UID 1145	44ms	424 KiB	C++14[O2]	581 Bytes	2026-7-29 18:00:45
AC	reject	44ms	576 KiB	C++14[O2]	578 Bytes	2026-9-29 18:39:16
AC	Guojiasheng	54ms	640 KiB	C++14[O2]	571 Bytes	2026-9-29 18:44:47