用for语句打印80行星号（每行20个）

状态	递交者	时间	内存	语言	代码	递交时间
AC	lisibo	2ms	13.1 MiB	C++17	184 Bytes	2023-7-10 8:00:59
AC	lishengcheng	2ms	11.8 MiB	C++17	191 Bytes	2023-7-20 16:39:43
AC	lishengcheng	2ms	11.8 MiB	C++17	191 Bytes	2023-7-20 16:39:34
AC	wangziqian	3ms	13.1 MiB	C++17	204 Bytes	2023-7-2 15:42:00
AC	chenyixin	4ms	12.6 MiB	C++11(O2)	176 Bytes	2024-8-18 8:56:28
AC	zhangjiayi	5ms	12.2 MiB	C++11(O2)	202 Bytes	2024-2-4 23:40:45
AC	sunyian	11ms	15.2 MiB	C++11(O2)	154 Bytes	2024-10-11 18:57:03
AC	dongyantao	11ms	12.6 MiB	C++11(O2)	163 Bytes	2024-8-15 17:36:12