#include <bits/stdc++.h>

using namespace std;

int rmq[9][502][502];

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);

  ifstream cin{"plantatie.in"};
  ofstream cout{"plantatie.out"};

  int N, Q;
  cin >> N >> Q;

  for (int i = 1; i <= N; i++) {
    for (int j = 1; j <= N; j++) {
      cin >> rmq[0][i][j];
      cerr << rmq[0][i][j] << "\n";
    }
  }

  for (int i = 1; i <= N; i++) {
    for (int j = 1; j <= N; j++) {
      cout << rmq[0][i][j];
    }
  }

  for (int k = 1; (1 << k) <= N; k++) {
    for (int i = 1; i <= N - (1 << k) + 1; i++) {
      for (int j = 1; j <= N - (1 << k) + 1; j++) {
        int p = (1 << (k - 1));
        rmq[k][i][j] = max({rmq[k - 1][i][j], rmq[k - 1][i + p][j],
                            rmq[k - 1][i][j + p], rmq[k - 1][i + p][j + p]});
      }
    }
  }

  while (Q--) {
    int l, r, k;
    cin >> l >> r >> k;

    int shift = 31 - __builtin_clz(k);
    int p = k - (1 << shift);
    cout << max({rmq[k][l][r], rmq[k][l][r + p], rmq[k][l + p][r],
                 rmq[k][l + p][r + p]})
         << '\n';
  }

  return 0;
}