Free days near weekend

A schedule is found that increases the number of free days near weekends (Fri, Sat, Sun, Mon) for employees.

Feature Request

In the final presentation of our project another implemenation of this was requested. More details can be found in this open issue.

Implemented using Google's OR Tools

src/cp/objectives/free_days_near_weekend.py

return sum(
    [
        sum(possible_free_first_day_variable) * -1 * self.weight,
        sum(possible_free_second_day_variables) * -1 * self.weight,
        sum(possible_free_both_days_variables) * -4 * self.weight,
    ]
)

The current implementation adds a reward for each free Friday, Saturday, or Sunday. Additionally, the day after one of those days gets a "reward" when it is free. When both days are free, a higher reward is given.