用for语句打印一行星号（20个）

状态	递交者	时间	内存	语言	代码	递交时间
AC	chenyutong	2ms	13.1 MiB	C++17	103 Bytes	2023-7-20 8:36:59
AC	lishengcheng	2ms	11.8 MiB	C++17	152 Bytes	2023-7-21 9:33:51
AC	wangziqian	2ms	13.1 MiB	C++17	165 Bytes	2023-7-2 15:34:17
AC	zhangjiayi	4ms	12.2 MiB	C++11(O2)	154 Bytes	2024-2-5 13:31:28
AC	songyitian	4ms	15.2 MiB	C++11(O2)	108 Bytes	2024-10-11 19:29:45
AC	lisibo	4ms	12.9 MiB	C++17	151 Bytes	2024-3-17 12:40:22
AC	sunyian	10ms	15.2 MiB	C++11(O2)	114 Bytes	2024-10-11 18:56:12