#include <fstream>
#define DIM 501
using namespace std;
ifstream fin("plantatie.in");
ofstream fout("plantatie.out");
int n,q,i1,j1,i2,j2,k,len,e[DIM],r[9][DIM][DIM];
int main() {
    fin>>n>>q;
    for (int i=1;i<=n;i++)
        for (int j=1;j<=n;j++)
            fin>>r[0][i][j];
    for (int p=1,k=2;k<=n;p++,k*=2)
        for (int i1=1;i1<=n-k+1;i1++)
            for (int j1=1;j1<=n-k+1;j1++) {
                i2=i1+k/2;
                j2=j1+k/2;
                r[p][i1][j1]=max(max(r[p-1][i1][j1],r[p-1][i1][j2]),
                                 max(r[p-1][i2][j1],r[p-1][i2][j2]));
            }
    e[1]=0;
    for (int i=2;i<=n;i++)
        e[i]=e[i/2]+1;
    while (q--) {
        fin>>i1>>j1>>len;
        k=e[len];
        i2=i1+len-(1<<k);
        j2=j1+len-(1<<k);
        fout<<max(max(r[k][i1][j1],r[k][i1][j2]),
                  max(r[k][i2][j1],r[k][i2][j2]))<<"\n";
    }
    return 0;
}