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#include <iostream>
#include <vector>

void go() {
    int32_t n;
    std::cin >> n;

    std::vector<int32_t> a;
    a.reserve(n);
    for (int32_t i = 0; i < n; ++i) {
        int32_t a1;
        std::cin >> a1;

        if (a1 > 0) {
            a.push_back(a1);
        }
    }

    int32_t min = a.size();
    int32_t max = -1;
next:
    if (min == max) {
        std::cout << min + 2 << "\n";
        return;
    }

    int64_t res = max == -1 ? min * 2 : (min + max) / 2;
    int64_t i = 0;
    int32_t lives = res - a.size();
    for (int64_t val: a) {
        lives += 1;
        while (val > 0) {
            if (lives == 0) {
                min = res + 1;
                goto next;
            }
            val -= (i + 1) * (res - i);
            lives -= 1;
            i += 1;
        }
    }
    max = res;
    goto next;
}

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int32_t t;
    std::cin >> t;

    for (int32_t i = 0; i < t; ++i) {
        go();
    }
}