注：本篇代码借鉴了某篇题解（不是抄的！！）
by gdjcwsk @ 2020-05-28 13:54:30
（毕竟我是初学ST表）
by gdjcwsk @ 2020-05-28 13:55:02
cout换了 输出太慢 只有800ms
by 谁是鸽王 @ 2020-05-28 14:00:16
@[谁是鸽王](/user/113460) 那用printf？
by gdjcwsk @ 2020-05-28 14:02:37
@[maoyiting](/user/171807) 好的，谢谢
by gdjcwsk @ 2020-05-28 14:03:30
@[maoyiting](/user/171807) 已经AC了，用的printf
by gdjcwsk @ 2020-05-28 14:03:45
@[谁是鸽王](/user/113460) 谢谢
by gdjcwsk @ 2020-05-28 14:03:51