含 k 个 3 的数

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	xzh13579	32ms	808 KiB	C++14(O2)	283 Bytes	2025-8-6 16:14:00
AC	_chjich_	37ms	808 KiB	C++14(O2)	244 Bytes	2025-7-11 9:54:18
AC	陈国瑞	38ms	856 KiB	C++14(O2)	281 Bytes	2025-7-15 17:31:33
AC	女乃龙	38ms	808 KiB	C++14(O2)	244 Bytes	2025-7-11 15:35:35