fast in cpp code example

Example 1: c++ fast i/o

#include <bits/stdc++.h>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
  	cout.tie(NULL);
    return 0;
}

Example 2: c++ fast

#include <bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
int main()
{
    fast;
    return 0;
}