#include <iostream>
#include <fstream>

using namespace std;

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

const int N = 503;
int n, m, r[N][N][13], log[N];

int max ( int x, int y, int z, int t )
{
    if ( x >= y && x >= z && x >= y )
        return x;
    if ( y >= x && y >= z && y >= t )
        return y;
    if ( z >= x && z >= y && z >= t )
        return z;
    return t;
}

int main()
{
    int i, j, k, p, x, y, a, b;
    in >> n >> m;

    for ( i = 1; i <= n; i++ )
        for ( j = 1; j <= n; j++ )
        {
            in >> r[i][j][0];
        }

    log[1] = 0;
    for ( i = 2; i <= n; i++ )
        log[i] = log[i/2]+1;
    for ( i = 1; i <= n; i++ )
    {
        for ( j = 1; j <= n; j++ )
        {
            for ( k = 1; (1 << k) <= i && (1<<k) <= j; k++ )
            {
                p = 1<<(k-1);
                r[i][j][k] = max( r[i][j][k-1], r[i-p][j][k-1], r[i][j-p][k-1], r[i-p][j-p][k-1] );
            }
        }
    }
    for ( i = 1; i <= m; i++ )
    {
        in >> a >> b >> k;
        p = log[k];
        x = a + k - 1;
        y = b + k - 1;
        j = max( r[x][y][p] , r[x][ y-k+(1<<p) ][p], r[ x-k+(1<<p) ][y][p], r[ x-k+(1<<p) ][ y-k+(1<<p) ][p]);
        out<<j<<'\n';
    }

    return 0;
}