nMachines = 6;
nOuvriers = 6;


productivite = array2d(1..nOuvriers, 1..nMachines,  [
  13, 24, 31, 19, 40, 29,
  18, 25, 30, 15, 43, 22,
  20, 20, 27, 25, 34, 33,
  23, 26, 28, 18, 37, 30,
  28, 33, 34, 17, 38, 20,
  19, 36, 25, 27, 45, 24])