I'm trying to generate the timetable for a school with two groups per year (12 groups total) but this year the program can't finish, it appears conflicts that can't solve. I change the distribution of the periods and subjects but , it's more or less the same... 225 of 234 and I can't advance. Any tip or recommendation!
Could you send me your file? If it is private, by email.
This is the file. I think I'm doing something wrong, and maybe I should change something but I don't know what to do... I have tried to change the periods of some subjects, but it's the same :-\
Thank you in advance.
I tried to obtain a smaller impossible file. I attach one, in which I removed all time constraints without the break, and teacher ANA-RELI. It seems impossible, it reaches max 232/234 fast and then stalls.
I will try some more.
I want to ask you if you know that an activity with duration > 1 cannot spread over a break. Otherwise, if you want to allow activities with duration 2 or 3 spread over a break, you need to simply remove the break constraint and decrease the number of hours per day from 10 to 9. If I do this on my attached file liviu3.fet it seems to work. If you want to do this on your file, don't forget to update the other "not available" constraints.
Thank you for your help. I have to think how to change something because we need "Ana-reli teacher". Maybe changing the periods of long subjects like lengua and mates, or dividing ciencias or EF in 3 periods instead of 2.
I thought it was going to be easier :D
You can keep the teacher ANA RELI.
I tried something, I don't know if your school admits it, but it is the only way I could reach to a solution: I removed the break, and added a variable break for the students, using dummy activities with subject "pause students" which can be at 11:30 or 12:00. I attach the file and a solution. Unfortunately, I tried to add a variable pause for teachers but it did not work. This file is still difficult, I could only obtain one solution. It might be a starting point, if you add some constraints for the teachers.