int a[5][4] = {{1,1,1,0},{-2,-3,2,1},{2,-5,0,-1},{-1,4,6,2},{-6,6,3,4}};
  int maxIndex = 0;
  int maxVal = a[0][0];

  for (int i=0;i<5;i++){
    for (int j=0;j<4;j++){
      if (a[i][j] > maxVal){
        maxVal = a[i][j];
        maxIndex = j;
      }
    }
  }

  std::cout << "najwieksza wartosc: " << maxVal << " index: " << maxIndex;