Fast Input Output

#1

Is there any way to improve the speed of standard input and output in c++?

#2

See https://usaco.guide/general/fast-io?lang=cpp :slight_smile:

#3

I know that, but that page chiefly talks about file input and output. I was wondering if there was any way to improve standard input and output speed(such as cin, cout), besides that endl trick at the end of the page.

#4

Okay, so you could use ios_base::sync_with_stdio(0); cin.tie(0);. Also, scanf and printf are generally faster than cin and cout, but with ios_base::sync_with_stdio(0); cin.tie(0); , the IO speed is just as good if not better than scanf and printf. Despite the new USACO rule, the old problems that you practice in are still file IO, so I recommend you copy and paste this as sort of a “template” for your IO:

void setIO(string name="") { // name is nonempty for USACO file I/O
    ios_base::sync_with_stdio(0); cin.tie(0); 
    if(name.size()){
        freopen((name+".in").c_str(), "r", stdin);
        freopen((name+".out").c_str(), "w", stdout);
    }
}

Hope that answers your question :wink:.

#5

The module includes standard input output (https://usaco.guide/general/fast-io?lang=cpp#a-faster-method, etc).