Recently I tried to upsolve this problem

In the problem statement, subtask 5, 6 should be independent scored from subtask 1, 2, 3, 4

However, subtask 6 is linked with 1, 2, 3, 4.

which means if I failed subtask 1, I cannot get my normal scoring on subtask 6.

When I tried to score only on subtask 6, I always get unknown WA.

I've wasted so much time debugging, when the problem is not on me.

I wanted to report this issue to oj.uz, but I couldn't find a way to do so.

Does anyone know how to report this to oj.uz ? so that if something similar happen next time, There's a way to fix it.

Thanks!