Invitation to CodeChef October Lunchtime 2019

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I hope I reach 3 stars after this contest :smiley:

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maximum rating that can be obtained in a single contest is fixed so thats not possible.

but in a few contest you will be 6-7 star easily

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Author’s solution seems incorrect ( I am 99.99% sure) for Kth Numbers.
No one is replying to comments about this issue. :frowning:
@jafarbadour @teja349 @kingofnumbers @kal013
Can anyone find any issue in this solution CodeChef: Practical coding for everyone ?
Edit :
Added comment 2.5 hours ago (8:29 pm) about this issue. Still no reply.
So I assume contest won’t be unrated and problem will be correct.
Please help me in finding bug.

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Is the subtask 1 of Kth numbers correct ?

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All getting WA in subtask 1 and AC in subtask 2 still admin be like
“We are correct”. What a confidence !! :expressionless: :clap:

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First subtask seems wrong for kth numbers. My code gives WA if i exit before reading n for 10th testcase and gives SIGABRT if i read n for 10th case?

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Maybe the same thing is happening with me here : CodeChef: Practical coding for everyone

The interesting part is what gone wrong after i changed it to this :
https://www.codechef.com/viewsolution/27584185

Can anyone help me understand ?

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Can anybody tell me what’s wrong with this solution for first subtask? CodeChef: Practical coding for everyone I’ve stress-tested with another one that got it and found no wrong case.

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My solution uses naive multiplication on smaller testcases and passes. Most probably there would be a bug in your code.

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tagging yourself ? XD \hspace{0mm}

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Mine is simple brute force. :pensive:

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Same here. I did brute force for this formula.

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I kept getting WA on the small test case. In fact, I tried asserts and it seems that there is an issue with test cases. I tried A_i\ge -10^9 and it gave SIGABRT!

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Did anyone get the first subtask right ?

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Same happened to me, I think. I don’t know FFT and other stuff but, CodeChef: Practical coding for everyone this O(n*n) solution should pass the first test case. Isn’t it?

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Haha, yeah! Looks like the same setter as Game of ORs in ICPC :rofl:

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can you check my solution ?? It gives Wrong Answer for subtask1.

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Yes, scoreboard also has problems. Check the ranks 102, 115 and 127. @admin

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My solution passed for first subtask in the contest only but why my submission is removed I got AC on first subtask in the contest I wasted my 2 hours on single problem only and Now that submission is removed why?? This rejudging criterion is ridiculous why people can’t bugless and fully tested problems for such a great contest rejudging after the contest tells us that sometime before you were right I joyed but later on when I saw the solution removed completely disgusting situation by codechef

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I used same formula but didn’t get correct answer for subtask-1. Solution is here.