ivan100sic's blog

Replying to many messages at once on CF
By ivan100sic, history, 3 years ago, In English

Recently, in Codeforces Round 677 (Div. 3) I made a lot of hacks on problem F, and naturally, several users contacted me asking for the testcase I used. The problem is that even if I wanted to, I couldn't reply to all of them quickly, because CF imposes a limit of sending a message to 2 distinct users per hour, and even that seems to be implemented incorrectly, as I could only send one reply to one user, even though I only replied to two of them in total.

Can someone from CF HQ check whether this is implemented correctly and, if possible, implement a feature where message replies don't count towards the 2 persons per hour limit.

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Comments Comments (16)
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3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Yeah, sometimes it's very frustrating.

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    3 years ago, # ^ |
      Vote: I like it -43 Vote: I do not like it

    Yeah man I am so frustrated like i devote 5-10 hours to Cp in a week and I have been doing this for almost 9 months now but I was unable to solve DIV3B today.

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      3 years ago, # ^ |
        Vote: I like it +1 Vote: I do not like it

      Devote 5-10 hours every day and see the difference.

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        3 years ago, # ^ |
          Vote: I like it -18 Vote: I do not like it

        Bhai itna time nahi hai nowadays I am hearing CP is useless anyway so it is not a good use of time.

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

          grapes are sour...

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            3 years ago, # ^ |
              Vote: I like it 0 Vote: I do not like it

            Salle tameez se

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              3 years ago, # ^ |
                Vote: I like it 0 Vote: I do not like it

              I would recommend you to first learn manners and only then try to learn CP. It might be a reason of your constant failure. Even after that if you can't improve, then I guess you just suck at CP. Quit it and find something else "less useless" to you.

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3 years ago, # |
  Vote: I like it +40 Vote: I do not like it

Is there really such a feature? I just sent 3 messages to 3 different people within seconds of each other.

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    3 years ago, # ^ |
      Vote: I like it -47 Vote: I do not like it

    Sir I messaged u. No reply?

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      3 years ago, # ^ |
      ← Rev. 3   Vote: I like it 0 Vote: I do not like it

      Is he obliged to reply to you? I know it's not my business but it's not your business either. Its upto him to reply to you or not. By the way, you have an amazing contribution on CF.

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    3 years ago, # ^ |
      Vote: I like it +5 Vote: I do not like it

    Same. There was a day where I had 10 messages. When I opened CF messages, I was able to reply to 5 of them in the first 10 minutes then the other 5.

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    3 years ago, # ^ |
      Vote: I like it +6 Vote: I do not like it

    It is only implemented during a contest I guess. Since hacking phase is a part of the contest, hence the restriction.

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    3 years ago, # ^ |
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    There are restrictions on how many people you can send msgs in an hr/day/month. But limit varies from person to person. No one knows how it is decided. See

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3 years ago, # |
  Vote: I like it +13 Vote: I do not like it

There are hidden limits for the number of messages sent and distinct recipients. In the past I hit "msgs per 5 minutes" and "recipients per 24 hours". As Mike once told me, the limit "is much greater [...] for high-rated accounts".

Maybe a good fix is not to count replies. After somebody writes to me, my first message to them shouldn't be counted towards any limit.

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    3 years ago, # ^ |
      Vote: I like it +57 Vote: I do not like it

    All of this makes sense except that the OP has a very high rating.

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      3 years ago, # ^ |
        Vote: I like it +24 Vote: I do not like it

      Maybe he's treated as non-rated because he didn't participate for 6 months?

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