factorial of a given number using array precalculation

factorial of a given number using array precalculation 

#include<bits/stdc++.h>

using namespace std;

#define ll long long int

long long int fact[21];

ll i;

int main()

{

     fact[0]=1;

 fact[1]=1;

for(i=2;i<=20;i++)

{

    fact[i]=fact[i-1]*i;

}

    ll t,n;

    cin>>t;

    while(t--)

    {

        cin>>n;

        cout<<fact[n]<<endl;

    }

}