【例21.3】字符类型判断

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	askaguo	21ms	512 KiB	C++98	225 Bytes	2025-12-14 16:38:34
AC	raycao	22ms	536 KiB	C++20(O2)	264 Bytes	2025-9-19 20:05:58
AC	jerryhu	22ms	516 KiB	C++98	240 Bytes	2025-11-30 10:35:40
AC	chengweisun	23ms	540 KiB	C++20(O2)	250 Bytes	2025-6-8 16:25:11
AC	stevexiong	23ms	552 KiB	C++98	329 Bytes	2025-11-9 21:01:46
AC	bowenzhang	24ms	556 KiB	C++20(O2)	361 Bytes	2025-11-29 9:31:10
AC	hankli	33ms	548 KiB	C++20	263 Bytes	2025-9-23 19:54:58