Free days near weekend

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

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.