vok8's blog

Non-deterministic Difference in Run-Time & A Suggestion to Problem Setters
By vok8, history, 4 years ago, In English

I participated in Codeforces Round #713 (Div. 3)

I had solved the Problem 1512G — Short Task, during the contest, which I believe at least ran on 3 pretests, as many participants got WA on TC 3, during the contest.

My During-Contest AC Code ran in 1940ms, with Pretests Passed Verdict.

The intended complexity for the problem, was O(10^7 log(10^7)), as described in the editorial.

My solution's complexity was the same.

After system test, my during-contest solution got TLE'ed on TC 3, the case which was included in pretests as well. (Code)

After system test, I submitted the same solution, without changing a single word/line, it got AC'ed in 1965 ms. (Code).

I saw the leaderboard and seems like I am not the only one to have a TLE'ed solution.

I truly agree that ~100ms non-deterministic difference in run-time is possible. But, if the intended solution requires TL so close to 2 sec., then it would have been better to put the TL as 2.5s or 3s. Also, this would have helped Python/Java solutions, which TLE'ed, to pass, and also the non-deterministic difference in run-time wouldn't have affected the solutions, with "intended" complexity.

Please, look upon this suggestion MikeMirzayanov.

Thank you.

Correct me, if I have wrote something wrong or contradictory.

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4 years ago, # |
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Auto comment: topic has been updated by vok8 (previous revision, new revision, compare).

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4 years ago, # |
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I submitted the same solution, without changing a single word/line

Screenshot-from-2021-04-11-12-54-46

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    4 years ago, # ^ |
    ← Rev. 4   Vote: I like it +6 Vote: I do not like it

    You can submit the same code, which you submitted during contest, once after the contest and it won't give you this warning/error.

    Just try once.

    Also, you can try checking and comparing my both codes here. You will see and get the verdict as These texts are identical.

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4 years ago, # |
  Vote: I like it +8 Vote: I do not like it

There's a blog about this problem already, by the way: https://codeforces.net/blog/entry/89544. You might want to move the conversation there to avoid duplication.

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