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 wasted so much time debugging, while the problem was 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!
Auto comment: topic has been updated by ZCKevin (previous revision, new revision, compare).
I think you can tag ojuz
Someone's training for IOI (づ｡◕‿‿◕｡)づ
I was beaten badly by IOI 18 day2 QQ
I had a full score idea for pA in my last 40 minutes. but due to some small error, my solution required a bit more than expected
but getting WA instead of partial score made me believe that there's something WRONG about my code rather some small constant factor.
I found that subtask linking issue after I tested it locally with IOI official testcases. QQ
Same. I thought it was an error from my code. But after revising my code multiple times and testing it on large testcases, I concluded that it was error from oj.uz. Because basically, my code gets score with same code in M=1 subtask(subtask 5). And an upgrade from subtask 5 to subtask 6 in my code is literally just 1 line of code.
it felt terrible during a virtual, cause that should never happen during a formal contest.
(Though in Taiwan training camp, there was once a big mistake in test cases.
And it was found out after the training camp ended ......)
Sorry for that, I mistakenly thought in every IOI 2018 problem the last subtask should contain all the other subtasks.
Now it's fixed, but I'm not sure whether re-grading all the submissions is possible since it would take too much time.
To contact me, you can send me (ojuz) PM, or click the green button on the lower-right corner of the website.
Thanks for your fix and hardwork !
Not only this, but it turned out the whole score scheme was wrong (so completely wrong that I can't describe it in words).
So, there's no choice but to re-grade all the submissions. Thanks for reporting this issue.