统计满足条件的4位数

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	adler	17ms	380 KiB	C++14	409 Bytes	2024-3-28 10:18:16
AC	易航	18ms	376 KiB	C++14	362 Bytes	2025-10-18 20:37:38
AC	xinao	19ms	504 KiB	C++14	417 Bytes	2023-11-1 19:01:16
AC	杜蓉蓉	19ms	828 KiB	C++14	272 Bytes	2025-7-12 19:45:42
AC	昊昊	20ms	504 KiB	C++14	270 Bytes	2025-10-18 20:03:07
AC	余尚儒	20ms	420 KiB	C++14	333 Bytes	2025-10-18 20:38:52
AC	cherry	21ms	900 KiB	C++14	274 Bytes	2025-7-12 19:39:14
AC	宇轩	21ms	376 KiB	C++14	340 Bytes	2025-10-18 20:40:54