#include <bits/stdc++.h>
using namespace std;
void OPEN(string s)
{
    freopen((s + ".in").c_str(),"r", stdin);
    freopen((s + ".out").c_str(),"w", stdout);
}
int n;
vector<int> v;
int nxt(int i, int x)
{
    int st = i + 1, md, en = n - 1;
    while(st < en)
    {
        md = st + ((en - st) / 2);
        if(v[md] - v[i] < x)
            st = md + 1;
        else
            en = md;
    }
    return st;
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t;
    cin >> t;
    while(t--)
    {
        cin >> n;
        v.resize(n);
        int ans = n-1;
        for(int i = 0; i < n; ++i)
            cin >> v[i];
        for(int i = 1; i < n; ++i)
            v[i] += v[i - 1];
        for(int i = 0; i < n; ++i)
        {
            int cnt = i, j = nxt(i,v[i]), lst = i;
            for(; j < n; j = nxt(j,v[i]))
            {
                if(v[j] - v[lst] != v[i])
                {
                    cnt = 1e9;
                    break;
                }
                cnt += (j-lst-1);
                lst = j;
            }
            if(lst == n-1)
                ans = min(ans,cnt);
        }
        cout << ans << "\n";
    }
}