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#include<bits/stdc++.h>
 
#define pb push_back
#define pob pop_back
#define eb emplace_back
#define fi first
#define se second
#define turbo ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define mid ((l+r)/2)
#define midLL ((l+r)/2LL)
#define mide ((lo+hi)/2)
#define mideLL ((lo+hi)/2LL)
#define endl '\n'
#define random_shuffle shandom_ruffle
#define lowbit(x) x&(-x)
#define bits(x) __builtin_popcount(x) 
#define mins(se) (*se.begin())
#define maxs(se) (*--se.end())
#define all(x) x.begin(), x.end()
#define log2_floor(i) (i ? __builtin_clzll(1) - __builtin_clzll(i) : -1)
#define siz(cont) ((int)cont.size())
#define each(it, cont) for(auto &it : cont)

using ll = long long;
using pii = std::pair<int, int>;
using pll = std::pair<ll, ll>;
using pli = std::pair<ll, int>;
using pil = std::pair<int, ll>;
using vll = std::vector<pll>;
using vii = std::vector<pii>;
using vi = std::vector<int>;
using vl = std::vector<ll>;
using vvl = std::vector<vl>;
using vvi = std::vector<vi>;
using vvii = std::vector<vii>;
using vli = std::vector<pli>;
using vvli = std::vector<vli>;
using vil = std::vector<pil>;
using vvil = std::vector<vil>;
using vc = std::vector<char>;
using vvc = std::vector<std::vector<char>>;
using vb = std::vector<bool>;
using vvb = std::vector<vb>;

void err() { std::cout << "\n"; fflush(stdout); }
template<class T, class... Ts>
void err(T arg, Ts &... args) {
    std::cout << arg << ' ';
    err(args...);
}

using namespace std;

ll po_2(ll n) {
    return n*(n-1LL)/2LL;
}

ll po_3(ll n) {
    return n*(n-1LL)/2LL*(n-2LL)/3LL;
}

ll mx_calc(ll pre, ll x, ll suf) {
    ll res = pre*x*suf;
    res += po_2(x)*(suf+pre);
    res += po_3(x);
    return res;
}

vl v;
int n;

bool check(ll ile) {
    ll pre = 0;
    for (int i = 0; i < n; i++) {
        bool git = false;
        for (ll x = 1; x <= ile; x++) {
            ll mx_gr = mx_calc(pre, x, ile-x);
            if (mx_gr >= v[i]) {
                ile-=x;
                pre+=x;
                git = true;
                break;
            }
        }
        if (!git)
            return false;
    }
    return true;
}


void solve() {
    cin >> n;
    v.clear();
    while (n--) {
        ll x; cin >> x;
        if (x)
            v.pb(x);
    }
    n = siz(v);

    int l = 0, r = 202200;
    while (l+1 != r) {
        if (check(mid))
            r = mid;
        else l = mid;
    }
    cout << r << endl;
}

signed main() { 
    turbo;
    int tt; cin >> tt;
    while (tt--)
        solve();
}