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But in group 1, there is an HIS subject paired with the HIS subject of another group in class 10A2

I followed the division Y10,Y11,Y12.
If there are many different subgroups in a class, I add a constraint EN cannot overlap time with HIS or similar. I did it. The problem takes a long time, if you have many classes and each class has many subgroups.
Thank you very much!

Group 1 (MAT, LIT, EN, HIS) has EN studying with students in 10A2,10A4,10A5
HIS studies with students in grades 10A3, 10A6
Students studying in Group 1 (MAT, LIT, EN, HIS): EN cannot overlap time with HIS
Similar to the remaining groups: BIO must not overlap in time with CHE

Hello, Liviu
My problem has not been solved yet
I have 40 students in class 10A1:
40 students study math and literature in class 10A1, 35 students study English, 5 students do not study English
Of the 35 students studying English, divided into 3 groups: group 1, there are 15 students studying History; Group 2 has 10 students going to local school, group 3 has 10 students going to technology school
Of the 5 students who do not study English, they are divided into 3 groups: group 1 has 2 students studying biology and chemistry; Group 2 has 2 students studying chemistry and physics; Group 3 has 1 student studying physics and chemistry.
Help me

Save your history and allow searching, you've done well. Thank you!

Thank you!
Why don't you allow selecting 12 to 15 constraints out of order or selecting random numbers n, m... at the same time?

https://www.mediafire.com/file/f7gutt1o5mxighz/TKB_dang_chay_ky_2_ep_sinh_ep_steam.fet/file
Can you try this file to see if you can get a schedule?
Because FET runs randomly, with unpredictable results, many users will have difficulty when encountering this situation

Hello, liviu,
Why in the memory history section do you not allow retrieving data from n=1-100 but allow retrieving data from n=2-101?

Why don't you report the error correctly at a certain time? I can't schedule it. For example, if after 15 minutes the scheduling fails, report the exact error. Let me reduce the weight or change that constraint

Hello! Liviu
Why does FET run for 15 minutes successfully, sometimes for 30 minutes, but not for 10 hours?
tôi đã gửi file cho bạn qua gmail

I will try and reply soon

I feel very good
Thank you very much

Great, it would be better if you allow users to save history and use that history as well

Allows you to delete part or all of it with one click, thus making the teacher's time/space constraints more complete.

Go to the first box of all time/space constraints, apply a filter and delete the constraints listed there. I was able to delete them, but it took time to filter and so it wouldn't be organized for 1 teacher constraints