判断是否为个位数

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	黄栎烨	22ms	6.4 MiB	C++14(O2)	171 Bytes	2025-5-11 23:03:51
AC	夏翌捷	22ms	6.4 MiB	C++14(O2)	210 Bytes	2025-5-2 21:54:43
AC	雷子扬	22ms	6.4 MiB	C++14(O2)	155 Bytes	2025-5-10 21:38:22
AC	郑恒霄	22ms	6.4 MiB	C++14(O2)	236 Bytes	2025-5-7 20:39:44
AC	张梓锜	22ms	7.3 MiB	C++14(O2)	196 Bytes	2025-3-26 18:26:00
AC	应智铭	22ms	6.7 MiB	C++14(O2)	153 Bytes	2025-3-26 18:21:45
AC	叶宇轩	22ms	6.4 MiB	C++14(O2)	156 Bytes	2025-4-16 21:16:25
AC	吴昀轩	23ms	6.7 MiB	C++14(O2)	165 Bytes	2025-3-26 19:55:23
AC	章锦艺	23ms	6.4 MiB	C++14(O2)	173 Bytes	2025-5-1 14:24:43
AC	李云龙	23ms	6.4 MiB	C++14(O2)	159 Bytes	2025-5-7 22:46:37
AC	邵奕歌	23ms	6.4 MiB	C++14(O2)	208 Bytes	2025-5-3 10:52:35
AC	易铂迪	23ms	6.6 MiB	C++14(O2)	153 Bytes	2025-5-8 16:54:53
AC	应牧恒	23ms	6.5 MiB	C++14(O2)	159 Bytes	2025-5-3 16:52:49
AC	戴浩宇	23ms	7.2 MiB	C++14(O2)	158 Bytes	2025-3-26 18:30:06
AC	凌畅	23ms	6.8 MiB	C++14(O2)	207 Bytes	2025-5-4 8:50:02
AC	郑皓旭 (YC113)	24ms	6.8 MiB	C++14(O2)	180 Bytes	2025-5-4 9:24:40
AC	谢逸骁 (CSP30)	24ms	6.4 MiB	C++14(O2)	164 Bytes	2025-3-29 16:00:45
AC	吴雅欣	24ms	6.9 MiB	C++14(O2)	163 Bytes	2025-3-26 18:24:08
AC	杨礼骁	24ms	6.4 MiB	C++14(O2)	250 Bytes	2025-5-10 16:19:59
AC	陈韩弋	25ms	6.5 MiB	C++14(O2)	160 Bytes	2025-5-3 16:11:08
AC	陈亦淳	36ms	6.4 MiB	C++14(O2)	153 Bytes	2025-5-10 8:43:03