CODE FESTIVAL 2016 Qualification Round A will be held on Saturday (time). The writer is sugim48.
This is one of the three qualification rounds of CODE FESTIVAL. Top 10 foreign students of this round will qualify. If you are eligible for the onsite contest, please don't forget to fill the form at https://krs.bz/rhd-itm/m/code_fes_2016. Please check the detail of the tournament at http://codeforces.me/blog/entry/46647.
The contest duration is 2 hours, and there will be 5 problems. The first 4 problems are mainly used for choosing domestic students and much easier than other tournament competitions. However, we added one more problem and we hope this is interesting enough for choosing top 10 qualifiers. (Anyway, most probably the qualifiers will be determined by the speed of solving all problems). Note that there is no time penalty for incorrect submissions. The time penalty is MAX, not SUM.
The point values are 100 — 200 — 400 — 800 — 1200. If you are unfamiliar with AtCoder System, 2X-point problem in AtCoder is as hard as TopCoder's d1 X-point problem.
Let's discuss problems after the contest.
UPD: Congratulations to tourist, Endagorion, LHiC, Arterm, Kostroma, mmaxio, Um_nik, ainu7, malcolm, FatalEagle! (I don't know who is eligible and this is not the official information, please let me know if some of them won't come.)
If you are sure that top-scorers will actually be sorted by speed of solving all problems, why don't you add harder problem (or even several problems)? I think that contests where lots of people have a full score usually make people unhappy, especially those who actually solved all problems but did it slower than the others. Of course, fast coding without bugs is also an important thing, but I believe that the good contest tests your skill of solving problems in the first place, and only after that, your skill of coding.
Will the same situation happen on the two remaining qualification rounds?
I agree that ideally the problems should be harder. However, we have budgets for only one extra problem for each round, and in order to avoid the worst situation where qualifiers are determined by the speed of first four problems, the last problem have to be on the safer (easier) side. Also, this is the first international contest for us and we are not sure about the number of strong participants.
We carefully chose the last problem such that it tests your thinking speed rather than coding speed. Even if you fail in one of the rounds, you still have two more rounds and I'm sure strong people like you will qualify with high probability.
Yes, the same situation will happen for all rounds, we've already decided all problems and the difficulties are about the same.
reminder (3 hours)
Sorry but can you remind me if we need to get to top 10 or 100 to advance to finals, since in the website it's said that "Place of residence is irrelevant." for top 100 (does it include non-japanese students?)
Top 10. (Where did you find top 100?)
Sorry, this is a mistake (it seems this is directly translated from Japanese version). Top 10, 5, 5 for A, B, C is the correct number.
rng_58 why is your name not there in the "top rated" list ?
Hmm, it seems I'm inactive. Recently I'm not diligent enough to compete in 1:35-3:35 AM matches, but I'll try some earlier matches.
I registered but can't see the tasks.
Not started yet. 12minutes to go!
That's my third time when i submitted and got -1 for just reading from file.Can you make a feature that doesn't judge the solution if it doesn't pass the samples please?
There's no penalty for WA in this contest anyway.
I have RE,i mean making the feature in all other contests in future.
UPD. Now i got it,i thought that there is no penalty only for WA.
"Note that there is no time penalty for incorrect submissions. "
Duh.
>woke up at 5AM
>solved all problems with 48 minutes to go
>still far away from qualifying
:D
It will be funny to invite Adam to onsite but not to send visa letter.
subscriber: "Da ty prosto Um_nik!"
I also did this. If you have some mistake that can be caught by sample, testing locally probably makes you know about it much faster. However judge was pretty fast today, so difference wouldn't be big. However automatically generating own tests locally (unless you are in a desperate need of having countertest) would be pretty unnecessary :p.
Was that intentional? :D
What do you mean? Is here some pun I didn't notice :p? Best I could come up with now was some vague connection to pregnancy, but I didn't mean this :p.
I meant the contest yesterday — http://codeforces.me/blog/entry/47258#comment-316468 :D
My solution for problem D works for O(n2). Here is the code:
http://pastebin.com/4MCWYCw1
If all numbers are on the same line, my dfs performs n2 operations and works for 76s locally. However, this solution passed.
Those who are getting WA on D, check out this case.
Whoah, I completely didn't think about interactions between different components. Fortunately my code is still ok :P.
I can't understand what you want to explain by this picture. we can change it as follow:
That is the correct answer. The image explains if you use DFS to determine each row / column's value and judge if every cell's value are non-negative by adding minimal value of rows and that of columns, it fails on this case.
OK. It must be so sad that getting WA due to do such an unnecessary and wrong thing...