Not too many consecutive working days

The aim is to minimize consecutive working days that extend to six or more, in order to prevent prolonged periods of work.

Implemented using Google's OR Tools

src/cp/objectives/not_too_many_consecutive_days.py

        possible_overwork_variables.append(day_phase_variable)

return sum(possible_overwork_variables) * self.weight

For each non hidden employee we create variables that show potential day phases that are longer than max_consecutive_shifts, meaning working multiple days after each other. max_consective_shifts is set to MAX_CONSECUTIVE_NIGHTS which is defined as 5 in src/solve.py. The sum of those variables corresponding to phases is weighed and used as penalty. For longer phase length the weight is increased exponentially, penaltising long night shifts quite heavily.

Note

Similar to Minimize Consecutive Night Shifts but without the expontential relation to the length of the phase, allowing longer phases compared to night shifts.