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jjang36524's blog

By jjang36524, history, 3 weeks ago, In English,

Today, in lots of contests, hacks are unrespected. There are no hacks in 90% of div1 round. However, find someone's mistake is a nice skill. I suggest a hacker contest. 1. There is no score for the problem, only for hacks. 2. You are allowed to copy someone's codes into local. 3. 2 hour solving and 12-hour hacking, like educational codeforces. 3.5. You could hack the problem only if you solved it. 4. No pretests except samples, and no systest either. The only real test would be from hacks. 5. Score is 100*successful hack-50*unsuccessful hack. Of course, the contest should be unrated, because it is hackforces, not codeforces.

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By jjang36524, history, 2 months ago, In English,

In a div2 only round, when the person with rating 2099 is the first, he jumps 200 points or more. However, if he is 2100, he does not get anything. Therefore, I suggest a gradual division boundary. First, we calculate the standing including every person that his rating could change and calculate the rating.

In div2, if his rating is lower than 2000, it is fully rated for him. If his rating is between 2000 and 2200, he would get ratingchange*(2200-rating)/200 ratings. If his rating is greater than 2200, he is unrated and doesn't include in the standings. Same thing for div3 and div4, with different bound. However, I think it should not be done in div1+2 separated round since 1900 could just join div1.

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By jjang36524, history, 6 months ago, In English,

The codeforces round 610(Div.2) starts at 3 days after now, but the registration is only open for 14 hours. Is it intended? UPD: fixed

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By jjang36524, history, 7 months ago, In English,

I saw something strange on rating. Example His real rating is 1882 and he is an expert, but the contest rating is displayed 1356, colored blue. Isn't it strange?

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By jjang36524, history, 10 months ago, In English,

If there are these types of the contest, I think codeforces would be more interesting. 1. hackforces. This type of contest has absolutely zero pretest and weak system test. Some wrong code may get right if there is no hack. (Maybe no uphacking update would be good) 2. the G takes it all. The point of the problem would grow like 100 400 1600 6400 25600 102400. Exponentially. Who only barely solved g wins against who solved a~f in fast time. 3.Speed! The point of the problem reduces by half in 30 minutes. The first to the tenth solver of each problem would get the increased point. 4. The shortest round ever. Contest time would be 30 minutes, no reducing points for time, and LOTS of implementation problem! Who is the fastest typer in the world? Dear MikeMirzayanov

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By jjang36524, history, 11 months ago, In English,

I am on round and I didn't submitted any solution. Is it rated?

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