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

vector<long long int>v;
int main()
{
    freopen("in.txt","r",stdin);
    freopen("out.txt","w",stdout);
    long long int n,i,t,j,k,a;
    cin>>t;
    while(t--)
    {
        cin>>n;
        v.clear();
        for(i=0;i<n;i++)
        {
            cin>>a;
            v.push_back(a);
        }
        long long int count=0;
        for(i=0;i<n;i++)
        {
            for(j=i+1;j<n;j++)
            {
                if(v[i]>v[j])
                {
                    swap(v[i],v[j]);
                    count++;
                }
            }
        }
        cout<<"Optimal train swapping takes "<<count<<" swaps."<<endl;
    }
    return 0;
}