SRM 663 - Codeforces

9 лет назад, # |

+17

I have never solved hard problems(srm 659 and TCO 2B) written by you. Hope I can solve it this time 0w0... And I really enjoy your problems. ^_^

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zxqfl

9 лет назад, # ^ |

+12

Thank you, and good luck tomorrow! (And the week after)

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9 лет назад, # ^ |

But I can't launch topcoder arena because of some java security problems now. Maybe I can't participate this srm. >_<

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9 лет назад, # ^ |

+20

Guesses: clear Java cache, try different types of connections in the arena, try the web arena, try different versions of the arena (I've saved some and it helped), reinstall Java, reinstall OS, try a different computer, dance on left leg in moonlight, ask TC support... dig on TC forums for someone else having similar problems.

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Rubanenko

9 лет назад, # ^ |

+35

Come on, it's too simple ;)

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Na2a

9 лет назад, # ^ |

As far as I know, there is java-independent web-arena.

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9 лет назад, # ^ |

Yes. But I'm not familiar with web-arena. So I give up participating it.

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saurabhverma

9 лет назад, # ^ |

Which OS do you use?

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9 лет назад, # ^ |

+19

I know how to solve the hard problem this time. ^_^ But I can't launch the arena. >_< A sad story.

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cgy4ever

9 лет назад, # ^ |

Not only you, but nobody have solved any of zxqfl's Div1-Hard yet: http://community.topcoder.com/tc?module=ProblemArchive&sr=&er=&sc=&sd=&class=&cat=&div1l=3&div2l=&mind1s=&mind2s=&maxd1s=&maxd2s=&wr=zxqfl

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9 лет назад, # |

Does anyone know if the Topcoder web arena is working properly now? Last time I tried, it is very laggy (cannot load scoreboard most of the time, cannot challenge..)

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marat.snowbear

9 лет назад, # ^ |

I used web arena to write two of TCO 2nd rounds this year (including last week) and the experience is a bit painful. First and worst of all it's often lagging on typing in the code, sometimes I type in a full line of code to see it appearing after several seconds. Also in both rounds chrome tab with web arena crashed one or two times per contest. Fortunately the code was safe (at least if you compile it). Also I think there are some bugs there, I've seen once that when contest started it was showing me "XXX opened 500-pt problem, YYY opened 500-pt problem" while people were opening 250-pt problem.

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9 лет назад, # |

Thanks. I hope unlike most TC authors recently, you take publishing the editorial seriously.

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9 лет назад, # ^ |

TC has independent editorialists, editorials are usually not published by authors.

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9 лет назад, # ^ |

Yes but it's not like they force the authors to sit back and watch as the "community" (of which TC is so fond) tries to find the solutions, is it ?

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9 лет назад, # ^ |

The point is that authors are not obliged to write the editorials. Plus, last SRM had an editorial posted here, occasionally other SRMs have them, and there's always discussion of the problems, which is as good if not better IMO (just not in one place and harder to extract info from).

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9 лет назад, # ^ |

Agreed.

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W4yneb0t

9 лет назад, # |

+47

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Killever

9 лет назад, # ^ |

← Rev. 2 →

I figured out a lot of re-submissions on 300 from high rated coders
I'm worry :( Passed :D no worries :D

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yeputons

9 лет назад, # |

+16

Fail. I was absolutely sure that my straightforward solution for 550 is O(n²) (and was really surprise to be the first one who submitted it). It is, but for a single test case. Sigh.

I determined it's incorrect, like, 5-10 minutes before the end.

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9 лет назад, # |

← Rev. 2 →

Lol, looks like "systest at 99.94%" means "systest started"... it's been stuck at 99.94% for a while.

UPD: Done. Meh, better than nothing.

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9 лет назад, # ^ |

Lol exactly my thought... one hell of a percent that last one.

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9 лет назад, # |

← Rev. 3 →

Who else receive strange test result in practice room for D1 550? I receive failed test #3, which is example 3 :| (when I run batch test it passed)

Edit: Nevermind, I got WA3 when I run test individually. I'll never use Batch test from now on..

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saurabhverma

9 лет назад, # ^ |

batch test uses two fields, success and correct example. Your solution passes the case if correct example is true. I hope this was the problem.

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9 лет назад, # ^ |

This surely looks like correct to me

[TEST CASE #3]:
Success: true
Status: 0
Return value: [I@e20834c
Correct example: true
Execution time (ms): 14
Peak memory used (KB): 106704

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saurabhverma

9 лет назад, # ^ |

What was the value returned when you tested individually?

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9 лет назад, # ^ |

It returns no.

Thank you for your concern, though I'm quite fed up with this & I'm going to sleep now until maybe when my friends wake me up to see the final judge result.

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Gassa

9 лет назад, # |

+74

The system test (and practice) results for 550-point problem look wrong.

For the test {1, 1, ..., 1}, {1, 1, ..., 1}, {999999, 999999, ..., 999999} (length 2000 each), the report goes like:

Expected:
...397979577, 397979577, 397979577}

Received:
...397979577, 397979577, 39797}

That surely looks like string truncation at some point.

Moreover, the only passed solutions are in Java, so the problem is probably language-specific.

The admins said they are already looking into it.

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I_love_tigersugar

9 лет назад, # ^ |

← Rev. 2 →

-16

Looks like there may be a test case or two that causes an issue with the testing system. We will likely remove those cases, and re-test. Will have results completed as soon as possible, but it may take a little time. Thanks for your patience.

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W4yneb0t

9 лет назад, # ^ |

+40

Removing might be a bad idea, the test case with lots of 1s is an important maxtest.

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Gassa

9 лет назад, # ^ |

So, you actually had to change the test cases: e.g., test case 40 which was [1] * 2000, [1] * 2000, [999999] * 2000 became [1] * 2000, [1], [999999]. Did you have to remove all cases where the output length exceeds a certain limit?

In my opinion, it is a shame that the system could not have been fixed instead to handle such cases correctly.

By the way, does MPSQAS still support only Java solutions? Might be no proper way to test for such bugs in advance then, since Java solutions did not seem to be affected.

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