Блог пользователя ndkhaivn

My codes were skipped without a proper reason?
Автор ndkhaivn, история, 8 лет назад, По-английски

Codeforces Round 388 (Div. 2) First at all, I want to complain about compiler!

Same code for problem D, I tried on my PC and on ideone, it's all fine. But it got CE on Codeforces compiler, then I changed lang to G++14 6.1.0, it got passed. So I got 2 wrong submissions and that wasn't my fail.

But that's no the worst!

When system testing end, I got AC at A B C D. And while i'm waiting for rating change, I found that my codes were skipped, without a announcement or reason.

Seriously, I SOLVED PROBLEMS ON MY OWN!

I'm looking forward to receiving feedback from pitfall and thank you in advance! GG!

UPD: This is my fail not setting privacy on ideone, but plz don't down vote, I had a really bad night, I don't wanna get negative contribution anymore :(

  • Проголосовать: нравится
  • +13
  • Проголосовать: не нравится

»
8 лет назад, # |
  Проголосовать: нравится +35 Проголосовать: не нравится

As you said, you tested your code on ideone. Probably, your codes were made public there and someone copied them.

→ Ответить
  • »
    »
    8 лет назад, # ^ |
      Проголосовать: нравится -10 Проголосовать: не нравится

    But this is caused by Codeforces's compiler error. I never meet this case before.

    → Ответить
    • »
      »
      »
      8 лет назад, # ^ |
        Проголосовать: нравится +24 Проголосовать: не нравится

      fofao_funk is talking about the reason your submissions were skipped (someone copied them from ideone and submitted them from his/her account).
      Compilation error does not add any penalty

      → Ответить
»
8 лет назад, # |
  Проголосовать: нравится +3 Проголосовать: не нравится

How about testing your code on ideone and you forgot to set it private? Like this http://mirror.codeforces.com/blog/entry/48584

→ Ответить
»
8 лет назад, # |
  Проголосовать: нравится +30 Проголосовать: не нравится

First, you don't get any points deducted for compilation errors. This is the official rule regarding this:

" If the result of the judging is Compilation Error, Denial of judgement (or similar) or if the solution didn't pass the first pretest, then this solution won't be considered in calculating results. " Link

Second, surely someone saw your code on ideone and submitted them from his/her account. You should have never left your code public at ideone during a contest in the first place.

Take this as a lesson and never keep codes public on any code sharing site or anywhere on the internet during a contest in the future.

→ Ответить
»
8 лет назад, # |
← Rev. 2   Проголосовать: нравится +17 Проголосовать: не нравится

If I didn't get CE, I'd not have it tested on ideone. Anyway, thanks for replying, I'll take this as my worst experience!

btw, these are some users used my code

humblecool

unbelievable02

RoadToMaster (Yes, Master ...)

→ Ответить
  • »
    »
    8 лет назад, # ^ |
      Проголосовать: нравится +40 Проголосовать: не нравится

    Lmao humblecool is indeed so cool. His last 50 submissions got skipped, and yet he does not give up. May be someday he will beat the system...

    → Ответить
»
8 лет назад, # |
  Проголосовать: нравится +20 Проголосовать: не нравится

out of curiousity, why did some people write their code in ideone instead of their local computer?

→ Ответить
  • »
    »
    8 лет назад, # ^ |
      Проголосовать: нравится 0 Проголосовать: не нравится

    As I said, due to Codeforces compiler's error, I have no idea what is going on, then I tried on ideone to make sure that it's not my error

    → Ответить
»
8 лет назад, # |
  Проголосовать: нравится +7 Проголосовать: не нравится

Would you mind sharing your compilation error messages? Looks suspicious. I've tried to submit one of your codes 23159820 myself (23172978) and Compilation Error feedback looks empty, the only message is Can't compile file:

→ Ответить
  • »
    »
    8 лет назад, # ^ |
      Проголосовать: нравится 0 Проголосовать: не нравится

    It's empty, too.

    Custom Invocation

    → Ответить
  • »
    »
    8 лет назад, # ^ |
      Проголосовать: нравится +2 Проголосовать: не нравится

    23159820 and 23159992 got skipped, so I can't show error messages, but they are same as above. Thanks for consideration!

    → Ответить
  • »
    »
    8 лет назад, # ^ |
    ← Rev. 2   Проголосовать: нравится 0 Проголосовать: не нравится

    I tried to compile the code on my laptop, and it took nearly 10 seconds with the flag -std=c++11 and used more than 2 GB of memory. Either the long time or the memory usage might be the reason why Codeforces aborted the compilation.

    Appenrently there is a bug in gcc (link). It can't handle arrays of pairs in tuples. 

    >>> /usr/bin/time -v g++ -std=c++11 test.cpp 
	Command being timed: "g++ -std=c++11 test2.cpp"
	User time (seconds): 9.22
	System time (seconds): 0.48
	Percent of CPU this job got: 99%
	Elapsed (wall clock) time (h:mm:ss or m:ss): 0:09.71
	...
	Maximum resident set size (kbytes): 2304092
	...

    Tested with gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4).

    This shouldn't be a problem anymore with version 6.2. Or at least not a big problem. Only 1.5 seconds time and 0.5 GB memory usage. 

    >>> /usr/bin/time -v g++-6 -std=c++11 test2.cpp 
	User time (seconds): 1.51
	Maximum resident set size (kbytes): 530572
    → Ответить