判断是否为两位数

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	ALT_wangyanruichen	19ms	20.4 MiB	C++14	177 Bytes	2026-9-27 21:17:39
AC	ALT_zhangzidong	19ms	20.4 MiB	C++14	154 Bytes	2026-10-4 19:09:28
AC	ALT_goushuai	20ms	20.4 MiB	C++14	210 Bytes	2026-9-28 20:12:34
AC	ALT_fengsiqi	20ms	20.4 MiB	C++14	183 Bytes	2026-9-29 22:27:12
AC	ALT_sunshuoran	20ms	20.4 MiB	C++14	156 Bytes	2026-9-28 22:03:22
AC	ALT_wangluoqi	20ms	20.4 MiB	C++14	171 Bytes	2026-9-23 20:31:00
AC	ALT_wangchujun	21ms	20.4 MiB	C++14	187 Bytes	2026-9-28 19:43:37
AC	ALT_wujinze	21ms	20.4 MiB	C++14	151 Bytes	2026-10-9 19:12:14
AC	admin	21ms	20.4 MiB	C++14	194 Bytes	2026-8-29 9:18:38
AC	ALT_heyongshan	22ms	20.4 MiB	C++14	188 Bytes	2026-9-30 20:59:58