Hey Codeforces!
Greetings from NJACK, the Computer Science Club of IIT Patna,
We feel excited to announce our very first edition of Apeireon , the annual coding fest of the Department of Computer Science and Engineering, IIT Patna. The fest will be packed with a plethora of fun events for all our dear "logicians". Introducing this time, Hacking Challenge, an event that requires you to think about the edge cases for the problems. The event is analogous to the process of hacking where we have to find loopholes in a built system. Here, you will be given a problem and its partially accepted solution (a code which seems to be correct but fails on some of the test cases), and you as ‘the debugger’ have to find an ‘edge’ test case where it fails. The problems have been prepared by scameeer, MinorMiracle, Redemptioner and leviOosa.
1st Prize : 5000 INR
2nd Prize: 3000 INR
3rd Prize: 2000 INR
Ranks/Prizes are considered globally.
Please find the rulebook and registration form links below.
Rulebook: https://bit.ly/2vFDIO3
Registration: https://bit.ly/2QAnXPM
Contest link: https://bit.ly/33N67Oz
For more such fun events do check our facebook page https://www.facebook.com/njack.iitp/
Very excited to participate in the event. Hope to get the cash prize.
Good Luck to all n Have Fun guys
Reminder : Contest starts in 5 hrs from now.
Reminder : Contest starts in 24 minutes from now.
I wish i had seen this 74 minutes before.
As you do not response on challenge page, I will ask here. Are you sure that your checker to problem F is correct? I am almost 100% sure that something is wrong with problem.
Yes we are sure that problem F is correct .
OK, what is c and n (k <= n^2) in problem H?
sorry for the typo c is defined in the question And c<=a^2
The question has been updated . It was a typo , Sorry for the inconvenience .
Again on problem F:) Maybe I do not understand something, but do strings a = "ac" and b = "bc" satisfying condition? If yes, which $$$d$$$ will work?
Your submissions for the question F are correct ! I manually checked them , I copied your hack and submitted from my account and it got accepted . It must be a hackerrank issue. We might remove the question since it is happening with 2-3 more contestants .
Ah, okay, that's happens...
We are extremely sorry for the inconvenience !!!!
Is this the only problem with such strange behavior?
Is there any time limit for each task?
1 sec only But we have not considered TLE hacks since in all questions the given code wont give TLE.
I am not able to get any verdict past 10 mins
Processed means WA as mentioned in instructions.
Can someone explain what mistake I made in I? I answered 2 2 4, which should work as the code given produces -1 and the area satisfies all the conditions? I feel I'm missing something stupid here :(
All in all, it was a pretty decent contest, definitely recommend :)
Seems that the contest is over, let's try to discuss the problems here.
For problem F, is test case n = 6, s = (1, 1, 1, 1, 1, 30) correct? (correct answer = 1, code outputs 15) The bishop is unable to move anywhere other than staying in its original position.
For problem I, is test case n = 2, s = (2, 4) correct? (correct answer 1 2, code outputs -1). The area is 2 * 4 = 8 which clearly has four distinct divisors.
Yes, for F I got AC with something like that I think.
Also, problem F's statement was changed midway of contest without announcement. Will there be any rejudge regarding the old vs new statement?
For F your test is correct, I used 6, (3, 1, 1, 1, 1, 1) with the same logic, and got AC.
Your F one was correct. Many people got it correct on that test case , even me. Don't know why it was showing wrong
Very weird. My in contest submission https://www.hackerrank.com/contests/hacking-challenge/challenges/mutated-bishop/submissions/code/1322258142 was marked incorrect, but the after contest submission of identical testcase was marked correct https://www.hackerrank.com/contests/hacking-challenge/challenges/mutated-bishop/submissions/code/1322263661. Don't think I make any stupid mistakes of inserting random whitespace or newline, so can't understand what really went wrong?
Seems that problem was not just with removed problem, but with hackerrank at all.
Hey Everyone!
So here went our very first online contest, Hacking Challenge v1.0. The event was a huge success, all because of the huge participation. With total 718 registered contestants who turned up for this event, we thank each one of you for your contribution towards making this event a ‘grandeur’ in the very first attempt of our annual coding fest, Apeireon. These are the top three contestants:
guptagaurang00
shubhamjainiitb
ll9311108110
Congratulations to all the winners for their brilliant performance!!! Fill this( https://bit.ly/2QAnXPM ) form (in case you have missed) to claim your prize money as soon as possible and contact Sameer(9028782395) for futher queries..!
Can you clarify the above discrepancies as well (Posted in the other comments)?
Actually, many contestants have submitted the correct hacks, but the custom judge was giving WA verdict even if the script was accurate. We don't know the reason, maybe it's a technical issue from Hackerrank. So finally we decided to remove one question from the contest to minimize the issues during the contest. We are incredibly sorry for the inconvenience:(
Can you please release some explanations/tutorial for all the problems? Or unlock other's submissions. Thanks.
We have uploaded them !
What is the test case for problem Help Me Divide ?
Any two numbers with ratio 1e5 a/b = 1e5 to be precise
100000 1 As it will give output -1