将字符串中的小写字母转换成大写字母

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	yisuokaer	15ms	404 KiB	C++14	234 Bytes	2024-4-9 19:28:34
AC	yisuokaer	15ms	376 KiB	C++14	282 Bytes	2024-4-9 19:28:09
AC	jiang	18ms	392 KiB	C++98	331 Bytes	2026-6-15 19:27:48
AC	adler	20ms	504 KiB	C++14	243 Bytes	2026-6-15 20:35:47
AC	穆思辰	22ms	504 KiB	C++98	246 Bytes	2026-7-4 20:37:01