Codeforces and Polygon may be unavailable from December 6, 19:00 (UTC) to December 6, 21:00 (UTC) due to technical maintenance. ×

Magolor's blog

Suggest Hack After Contest.
By Magolor, history, 7 years ago, In English

Sometimes wrong solutions or get Accepted, being found wrong after months.

Sometimes the original tests are too weak that brute force passed.

I Think Codeforces should support Hacking even after the contest(while rating changes may not be modified).

What about that?

  • Vote: I like it
  • +56
  • Vote: I do not like it

»
7 years ago, # |
  Vote: I like it +1 Vote: I do not like it

I think it would make Standings much more confusing. And people who were beaten by users with fake solutions would be mad at the author. It is also impossible to make system test which break every solution so there would be much more hacks over time.

→ Reply
  • »
    »
    7 years ago, # ^ |
    ← Rev. 3   Vote: I like it +14 Vote: I do not like it

    I know it cost too much. But some OJs in China have supported this(They do not or just partially rejudge the old submissions to avoid the huge rejudge cost).

    And people who were beaten by users with fake solutions would be mad at the author.

    I think if you know a program is wrong but it displays AC, it would be worse.

    Well, there are problems, such as "fake Hack" and Hack on Hashes.

    → Reply
    • »
      »
      »
      7 years ago, # ^ |
        Vote: I like it +5 Vote: I do not like it

      It is worse, but most of the time you don't know about it.

      → Reply
      • »
        »
        »
        »
        7 years ago, # ^ |
          Vote: I like it +14 Vote: I do not like it

        It is worse, because most of the time you don't know about it.

        → Reply
        • »
          »
          »
          »
          »
          7 years ago, # ^ |
            Vote: I like it +6 Vote: I do not like it

          It is worse, since sometimes I do know about it but I can do nothing.

          → Reply
»
7 years ago, # |
  Vote: I like it +6 Vote: I do not like it

Well, just an advice. (Most likely, it won't become true I guess

→ Reply
»
7 years ago, # |
  Vote: I like it 0 Vote: I do not like it

I think it is difficult as you can imagine the amount of rating changes that would occur because of this.

→ Reply
  • »
    »
    7 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Well, I said maybe we can only judge the newest submissions with the Hack test cases, do not rejudge or paritially rejudge the old ones and keep rating unchanged.

    → Reply
»
5 years ago, # |
← Rev. 2   Vote: I like it -8 Vote: I do not like it

;0

→ Reply