变为3的倍数

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	方一帆2	38ms	548 KiB	C++14(O2)	1 KiB	2025-11-28 17:17:07
AC	邹鑫町	44ms	596 KiB	C++14(O2)	479 Bytes	2026-1-11 11:40:03
AC	李昀轩	54ms	540 KiB	C++14(O2)	433 Bytes	2026-2-10 11:30:52
AC	jike1994	57ms	544 KiB	C++14(O2)	461 Bytes	2025-10-15 14:21:17
AC	许皓辰	57ms	548 KiB	C++14(O2)	382 Bytes	2025-11-16 16:21:04
AC	方一帆	59ms	556 KiB	C++14(O2)	499 Bytes	2026-6-7 11:16:00
AC	龙韵伊	62ms	552 KiB	C++14(O2)	373 Bytes	2026-7-22 10:45:27
AC	聂旭辰	64ms	556 KiB	C++14(O2)	531 Bytes	2026-7-17 15:16:53
AC	张天源	68ms	584 KiB	C++14(O2)	380 Bytes	2026-5-7 16:33:57