【例23.2】这个月有几天

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	高新亮	18ms	6.2 MiB	C++ 17	413 Bytes	2023-6-8 19:56:57
AC	邴诚文	18ms	6.4 MiB	C++ 17	600 Bytes	2023-5-3 15:55:15
AC	赵泽华	20ms	8.3 MiB	C++ 17	348 Bytes	2023-6-4 20:13:38
AC	单希乐	21ms	6.2 MiB	C++ 17	266 Bytes	2023-6-8 19:58:45