练40.1 小写变大写

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	wangyizhuo	5ms	764 KiB	C++11(O2)	211 Bytes	2025-2-11 16:09:51
AC	yaokeyu	6ms	536 KiB	C++11(O2)	202 Bytes	2025-1-17 13:59:43
AC	caoyuanxi	6ms	536 KiB	C++11(O2)	128 Bytes	2025-1-12 18:33:25
AC	gushuwei	6ms	768 KiB	C++11(O2)	200 Bytes	2025-1-4 11:47:58
AC	qinmingcheng	6ms	536 KiB	C++11(O2)	102 Bytes	2025-1-18 11:19:21
AC	chengzijun	7ms	536 KiB	C++11(O2)	150 Bytes	2025-1-16 12:34:59