【例21.3】字符类型判断

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	谢钰莹	13ms	504 KiB	C++98	251 Bytes	2025-12-1 20:39:15
AC	朱梓霖	13ms	504 KiB	C++98	235 Bytes	2025-10-1 10:51:10
AC	李文茵	14ms	508 KiB	C++98	251 Bytes	2025-12-1 20:37:11
AC	劳钰峰	14ms	504 KiB	C++98	252 Bytes	2025-10-15 20:28:50
AC	庞少卿	15ms	504 KiB	C++98	311 Bytes	2025-10-20 20:20:30
AC	陈沛宜	15ms	508 KiB	C++98	240 Bytes	2025-12-3 11:58:52
AC	朱子轩	15ms	552 KiB	C++14(O2)	234 Bytes	2025-9-15 20:32:22
AC	张若煊	16ms	536 KiB	C++98	241 Bytes	2025-9-24 19:25:16