统计数字字符个数

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	carlosdeng	21ms	516 KiB	C++20(O2)	199 Bytes	2025-12-6 11:07:47
AC	samuelgao	21ms	532 KiB	C++20	188 Bytes	2025-12-6 11:08:15
AC	tymonli	22ms	516 KiB	C++20	211 Bytes	2025-12-6 11:07:35
AC	williamyu	22ms	552 KiB	C++98	237 Bytes	2025-12-6 11:08:13
AC	chengweisun	23ms	508 KiB	C++20(O2)	228 Bytes	2025-12-6 11:07:21
AC	leomo	23ms	516 KiB	C++20(O2)	194 Bytes	2025-12-6 11:07:19