C + + cin and cout run timeout encountered in brush problem

CIN and cout Slow is a reason, the default time cin and stdin always keep in sync, while cout and stdout are same, the two mixed will not output sequence confusion.

The compatibility of the two causes CIN to have a lot of extra overhead.

The statement that disables this attribute is

Std::ios::sync_with_stdio (FALSE);

Cancelling the sync will speed up a lot, but still less than scanf and printf.

Use whatever you like to improvise according to the data volume of the topic.

C + + cin and cout run timeout encountered in brush problem