含k个3的数

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	张天源	30ms	6.2 MiB	C++14(O2)	446 Bytes	2025-2-9 11:14:41
AC	王子墨	31ms	6.3 MiB	C++14(O2)	355 Bytes	2025-5-21 18:52:42
AC	黄奕杰	32ms	6.1 MiB	C++14(O2)	281 Bytes	2024-9-7 10:42:25
AC	周鑫	34ms	6.2 MiB	C++14(O2)	313 Bytes	2025-2-16 16:31:05
AC	刘栌煊	41ms	6 MiB	C++14(O2)	367 Bytes	2024-8-28 19:03:51
AC	罗莎	46ms	6 MiB	C++14(O2)	250 Bytes	2024-9-2 12:42:32
AC	王嘉怡	53ms	6.3 MiB	C++14(O2)	231 Bytes	2025-5-31 10:07:02