How do I model the complete weekend? “If she/he works only one of the two days, Sat and Sun, this is penalized by the corresponding weight.”
Let’s enumerate all of the combinations as shown below.
| Item No. | SAT | SUN | Penalty |
|---|---|---|---|
| 1 | ✓ | Yes | |
| 2 | ✓ | Yes | |
| 3 | ✓ | ✓ | |
| 4 |
Penelized cases are only items 1 and 2. We prohibit the cases above as follows. Use Sat on the first day of the pattern.
✓ is It is a complement operator(means NOT) for the shift. Since the label ‘O’ here is the day-Off, ✓O displays “Work”.
See also How do I model ‘both Saturday and Sunday on or off’ constraints? .
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