#include <bits/stdc++.h>
using namespace std;
 
int main()
{
    int t;
    cin >> t;
    while (t--)
    {
        int n;
        cin >> n;
        int a[n + 123];
        for (int i = 1; i <= n; i++)
            cin >> a[i];
 
        for (int i = 2; i <= n; i++)
            a[i] += a[i - 1];
 
        int mn = 0, mx = 0, ans = 0;
        for (int i = 1; i * i <= n; i++)
        {
            if (n % i == 0)
            {
                int l = i;
                for (int j = l; j <= n; j += l)
                {
                    int s = a[j] - a[j - l];
                    cout << 1 << " " << s << endl;
                    mn = min(mn, s);
                    mx = max(mx, s);
                }
            }
        }
        ans = mx - mn;
        cout << ans << endl;
    }
 
    return 0;
}

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2
1 2
6
10 2 3 6 1 3
4
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15
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8
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