#include <fstream>

using namespace std;

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

int log[505][505];
int r[505][505][18];
int v[505][505];

int maxim(int a,int b)
{
    if(a<b)
        return b;
    return a;
}

void raspuns(int m)
{
    int biggest, i, l, current, lin, col, lat;
    for(int nr=1; nr<=m; nr++)
    {
        cin>>lin>>col>>lat;
        biggest = 0;
        for(int i=lin; i<=(lin+lat-1); i++)
            for(int j=col; j<=(col+lat-1); j++)
            {
                l = log[j][j-i+1];
                current = maxim(r[i][j][l], r[i + (1<<l) - 2][j][l]);
                biggest = maxim(biggest, current);
            }
        cout<<biggest<<"\n";
    }
}

void logaritm(int n)
{
    for(int i=1; i<=n; i++)
    {
        log[i][0] = 0;
        for(int j=2; j<=n; j++)
            log[i][j] = 1 + log[i][j/2];
    }
}

void matrice(int v[ ][505],int n)
{
    int i,j,k;
    for(i=1 ; i<=n ; i++)
        for(j=1 ; j<=n ; j++)
        {
            r[i][j][0]=v[i][j];
            for(k=1 ; (1<<k)<= j ; k++)
                r[i][j][k] = maxim(maxim(r[i][j][k-1], r[i][j - (1<<(k-1)) ][k-1]),maxim(r[i- (1<<(k-1))][j][k-1],r[i- (1<<(k-1))][j-(1<<(k-1))][k-1]));
        }
}

int main()
{
    int n,m,i,j,k,a;
    cin>>n>>m;
    for(i=1 ; i<=n ; i++)
        for(j=1 ; j<=n ; j++)
            cin>>v[i][j];
    matrice(v,n);
    logaritm(n);
    /*for(a=1 ; a<=m ; a++)
    {
        cin>>i>>j>>k;

    }*/
    raspuns(m);
    cin.close();
    cout.close();
    return 0;
}