max different buildings

[Vũ Ngọc Thành]

Hello LiViu
Many schools in Vietnam need to constraint  this
You can add this new constraint

[Liviu Lalescu]

Hello, Vu Ngoc Thanh,

Can't you use teachers/students max building changes per day/week?

[Vũ Ngọc Thành]

Many schools in Vietnam need changed after hour2

[Vũ Ngọc Thành]

Many schools in Vietnam need changed after hour2

[Liviu Lalescu]

Then I propose you two solutions:

1) Add a "Break" hour after the first two hours, and use max building changes per day = 1 and min gaps between building changes = 1,

or

2) Use the Mornings-Afternoons mode of FET, and use max building changes per day = 0. This will be for a FET day = half real day.

[Vũ Ngọc Thành]

Many schools in Vietnam   change after hour 2 and no change after hour 1 and no change after hour 3 and no change after hour 4 in morning or afternoon

[Vũ Ngọc Thành]

Many schools in Vietnam   change after hour 2 and no change after hour 1 and no change after hour 3 and no change after hour 4 in morning or afternoon. Illustrating images

[Liviu Lalescu]

Exactly, in my post above I proposed you two solutions.

Are you using FET in the Mornings-Afternoons mode? How many hours per FET day?

How many hours per real day do you have? 5?

[Liviu Lalescu]

Hmm... I see. So you can't use my solution (2). But I hope you can use my solution (1):

1) Add a "Break" hour after the first two hours, and use max building changes per day = 1 and min gaps between building changes = 1. You will have 6 hours per FET (half) day, of which the 3rd is break (X, red).

I might leave now and come back in a couple of hours, I might not be able to answer soon.

[Vũ Ngọc Thành]

if Add a "Break" hour after the first two hours then All Teacher  do not teach 2 schools will not teach 2 consecutive hours in hour2 and hour3

[Liviu Lalescu]

I arrived short time ago.

Hmm... very ugly situation, indeed. I will think of this now. Please allow me a bit. It might be possible with some tricks. If not, maybe we could try to develop a custom version just to see how a customization would work. Would you be interested?

I will think now more thoroughly and answer hopefully soon.

[Liviu Lalescu]

Hello, Vu Ngoc Thanh,

I think I got the solution: a new constraint, teacher(s) max building changes per real day interval. You will add 4 constraints for your case (first interval is Morning1 to Morning3, then Morning3 to Afternoon1, then Afternoon1 to Afternoon3, then Afternoon3 to End_of_day). What do you say?

If you like it, I hope I will be able to begin tomorrow. I will let you know.

@Volker Dirr , please also tell me what you think about this. Also, let me know if you think of a better name for the constraint.

[Vũ Ngọc Thành]

Yes, I like it

[Liviu Lalescu]

Great!

Do you think that in general I need to add also for students (not only in Vietnam, but internationally)?

[Vũ Ngọc Thành]

In Vietnam, this restriction is for teachers