The function GetTransitionTime is used to calculate the transition time between two activities of different transition type. The transition time is defined to be the greater of either 3, or half the absolute value of the difference between the two transition types. For example, the transition time between a masonry activity (type = 1), and a garden activity (type = 9), is 4.

IloNum GetTransitionTime(IloInt type1, IloInt type2) {
  if (!type1 || !type2 || type1==type2)
    return 0;
  return IloMax(3L, IloAbs((type1 - type2)/2L));
}