// If there is a command or anything that is too large to type, you use it often
// and wish you could type it faster, you can use #define to define it as
// something else,
#include <bits/stdc++.h>
using namespace std;
// for example one you can define 'push_back' command for vectors as 'pb'
#define pb push_back
// You can actually give it some values too, like this
#define fo(i,a,b) for(int i = a; i < b; i++)
int main(){
vector<int> vec;
// Now do this
vec.pb(5);
fo(i,0,10){
cout << i << endl;
}
// Instead of this
vec.push_back(5);
for(int i = 0; i < 10; i++){
cout << i << endl;
}
}