Non riesce a piazzare 1 attività

[Rossoprof]

Salve a tutti.
Ho predisposto un orario lasciando solo i vincoli non modificabili.
l'elaborazione e la generazione dell'orario in poco tempo riesce a piazzare 220 attività su 221 e poi continua senza giungere a conclusione

[Liviu Lalescu]

Buon giorno,

Scusi per l'inglese: I could try to help you with this, trying to find the bug/problem of your file, collaborating on your input file, but I can only do this as a paid service.

[Liviu Lalescu]

Buon giorno,

Scusi l'inglese: I thought some more and my previous message is maybe impolite, not in the spirit of this forum. Forgive me. I will try to help you find the bug on your input file for free. I am sure there is a bug in your file, not in FET. So please send me your file, here if it is public or by email if it is private.

I can understand a bit of Italian, but it is harder to write.

[Rossoprof]

thank you very much Mr. Liviu.
This attached is the file that I can't close (217/218 placed assets)

[Liviu Lalescu]

I hope I have good news! I modified the constraints min days between activities, the majority have 100%, and only two constraints (167-168-169 initially 20%, now 0.2%, and 397-398, initially 95%, now 0.95%) are broken. I generated multiple with break after 3 minutes, I obtained a timetable, attached (I attach the unlocked file, the locked - solution - file, and the random seeds to generate the timetable). I do not know why these two constraints are (or seem) impossible - you might know that better than me. The file is difficult, it seldom solves.

Neglect the warning when opening - I have the future FET 5.47.1 on my hard disk.

Please let me know.

[Liviu Lalescu]

I managed to obtain another timetable, attached. The file is very difficult, I got time limit (variable, from 3 minutes to 15 minutes) to about 70 timetables until now, and got only 2 finished timetables.

[Rossoprof]

Thank you very much, dear Liviu, I was in total confusion. Now I make some changes and I think I have solved
As in the past I will make a donation (deserved for the enormous contribution that Fet and its creator give to the school community)

[Liviu Lalescu]

Prego, Rossoprof!

I attach more solutions I obtained.

Grazie per le belle parole.