#include <fstream>

using namespace std;

ifstream in("plantatie.in");
ofstream out("plantatie.out");

const int NMAX = 500;
const int LMAX = 8;

int r[LMAX + 1][NMAX + 1][NMAX + 1], log[NMAX + 1];

int maxim(int l, int c, int lat)
{
    int e = log[lat];
    int p = (1<<e);
    return max(max(r[e][l - lat + p][c - lat + p], r[e][l - lat + p][c]), max(r[e][l][c - lat + p], r[e][l][c]));
}

int main()
{
    int n, q;
    in >> n >> q;
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= n; j++)
        {
            in >> r[0][i][j];
        }
    }
    for (int e = 1; (1 << e) <= n; e++)
    {
        for (int i = (1 << e); i <= n; i++)
        {
            for (int j = (1 << e); j <= n; j++)
            {
                int p = (1 << (e - 1));
                r[e][i][j] = max(max(r[e-1][i-p][j-p], r[e-1][i-p][j]),
                                 max(r[e-1][i][j-p], r[e-1][i][j]));
            }
        }
    }
    log[1] = 0;
    for (int j = 2; j <= n; j++)
    {
        log[j] = 1 + log[j/2];
    }
    for (int i = 0; i < q; i++)
    {
        int l, c, lat;
        in >> l >> c >> lat;
        l += lat - 1;
        c += lat - 1;
        out << maxim(l, c, lat) << "\n";
    }
    in.close();
    out.close();
    return 0;
}