DmitriyH's blog

By DmitriyH, 10 years ago, In English

Codeforces Round 225 (Div. 1) and Codeforces Round 225 (Div. 2) round statistics :

Div. 1

First accepted

A (00:01) Egor
B (00:27) Arcueid
C (00:12) ACMonster
D (00:16) yefllower
E (00:49) Gassa

Total hack attempts: +86:-36

Top-5 hackers:

900 hlwt +9:-0
750 ffao +8:-1
700 Fefer_Ivan +7:-0
600 Nanaya +6:-0
600 LongTimeNoThin +6:-0

Other info

FAQ




Div. 2

First accepted

A (00:02) AkshajK Berzhik Flyrise Heart_Blue MadNick Sick_coder Totktonada albertg laekov_ RoundDog mgch teodor94
B (00:07) Sick_coder c0d3junki3
C (00:07) Egor4k
D (01:43) Srantik_22 bryanhe
E (01:00) FastAC

Total hack attempts: +5:-91

Top-3 hackers:

200 elvircrn +2:-0
100 Killever +1:-0
50 fest +1:-1

Other info

FAQ





Any comments or suggestions are welcome :)

  • Vote: I like it
  • +75
  • Vote: I do not like it

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10 years ago, # |
  Vote: I like it +19 Vote: I do not like it

Your statistics are great, thank you for the effort! I would make one suggestion: maybe it's better to make less divisions in some charts with few accepteds, you would get more continuous graphs that better represent tendencies. For instance, one can see a nice distribution for Div1-A but not for Div1-C, which just looks totally random; doing less divisions may decrease variance and smooth the graph. However, I insist, very nice statistics!

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

    Thank you for the comment!
    Let's try to change division size in scores graph.

    Initial Div size is 10 :


    Div size 20 :


    Div size 30 :


    Which modification looks better?

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

      In my opinion 10 is better for A (you can see some very fast coders and there is still a nice distribution), but 30 would be better both for D (I don't know if it's my imagination but I can see an increasing tendency from 1800 up to 1300 that you don't see as much with size 10-20) and E (which just looks 'empty' with smaller sizes). However, it's very reasonable to have other opinions and that certainly changes from round to round

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

about Div-1 B problem, if there are 80 Hacked submissions, the no of successful hacks on it should also be 80, right? so how can there be +85 Hacks on it? o.O

plz correct me if i am wrong.

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

    85 successful hacks were made, but 5 of them were resubmitted and passed to next phase.