#include <fstream>
#include <climits>
#define dim 510
using namespace std;
int a[20][dim][dim];
int log[dim];
int i,j,k,n,m,l,c,len,sol;

int main() {
    ifstream fin("plantatie.in");
    ofstream fout("plantatie.out");
    fin>>n>>m;
    for (i=1;i<=n;i++) {
        for (j=1;j<=n;j++) {
            fin>>a[0][i][j];
        }
    }
    for (i=2;i<=n;i++) {
        log[i]=log[i/2]+1;
    }
    for (k=1;k<=log[n];k++) {
        for (i=1;i<=n;i++) {
            for (j=1;j<=n-(1<<k)+1;j++) {
                a[k][i][j]=max(a[k-1][i][j],a[k-1][i][j+(1<<k-1)]);
            }
        }
    }
    for(;m--;) {
        fin>>l>>c>>len;
        k=log[len];
        sol=INT_MIN;
        for (i=l;i<=l+len-1;i++) {
            sol=max(sol,max(a[k][i][c],a[k][i][c+len-(1<<k)]));
        }
        fout<<sol<<"\n";
    }
  /**  for (k=0;k<=log[n];k++) {
        for (i=1;i<=n;i++) {
            for (j=1;j<=n;j++) {
                fout<<a[k][i][j]<<" ";
            }
            fout<<"\n";
        }
        fout<<"\n\n\n";
    }  **/
    return 0;
}