toph - Sofdor Ali and Histogram

#include<bits/stdc++.h>
using namespace std;
#define fast()(ios_base::sync_with_stdio(false),cin.tie(NULL));
typedef long long ll;
int main()
{
    fast();
    ll t,c=1;
    cin>>t;
    while(t--)
    {
        ll n,x=0,i=0;
        cin>>n;
        while(i<n)
        {
            ll j;
            cin>>j;
            j*=n-i;
            x=max(x,j);
            i++;
        }
        cout<<"Case "<<c++<<": "<<x<<endl;
    }

    return 0;
}