#include <algorithm>
#include <iomanip>
#include <iostream>
#include <limits>

// Intentionally incorrect: Alice is restricted to a pure strategy.
int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int tests;
    std::cin >> tests;
    std::cout << std::fixed << std::setprecision(15);
    while (tests--) {
        int n, m;
        std::cin >> n >> m;
        double answer = -std::numeric_limits<double>::infinity();
        for (int i = 0; i < n; ++i) {
            double worst = std::numeric_limits<double>::infinity();
            for (int j = 0; j < m; ++j) {
                double a;
                std::cin >> a;
                worst = std::min(worst, a);
            }
            answer = std::max(answer, worst);
        }
        std::cout << answer << '\n';
    }
}