kostka's blog

By kostka, 10 years ago, In English

Hey there! Here are the hacking statistics from Codeforces Round 283 (Div. 2).

It wasn't very good round for hackers (especially because of strong pretests), but still — let's take a quick look. (Hacks description will be added later, sorry).

Previous posts can be found here, including div. 1.

Stats

Problem Successful hacks Unsuccessful hacks Other* Sum Solutions which can be hacked Accepted solutions All solutions on final tests Hackers efficiency**
496A - Минимальная сложность 0 (0.00%) 27 (55.10%) 22 (44.90%) 49 18 (0.81%) 2193 (99.19%) 2211 0.00%
496B - Секретный код 3 (8.57%) 19 (54.29%) 13 (37.14%) 35 78 (6.67%) 1091 (93.33%) 1169 3.70%
496C - Удаление столбцов 5 (11.90%) 28 (66.67%) 9 (21.43%) 42 274 (29.37%) 659 (70.63%) 933 1.79 %
496D - Игра в теннис 1 (33.33%) 1 (33.33%) 1 (33.33%) 3 25 (43.10%) 33 (56.90%) 58 3.85%
496E - Распределение партий 0 0 0 0 0 (0.00%) 7 (100.00%) 7

* one of the: INVALID_INPUT, GENERATOR_INCOMPILABLE, GENERATOR_CRASHED, IGNORED, OTHER.

** suggested by marat.snowbear and Yura_Sultonov — hacked solutions / (hacked solutions + solutions which failed on final tests).

Here should be graph.

I wondered why there were so many "Other" hacks, looking at them, it appeared that many of them were simply Invalid Input. Happily for these people it didn't count as (-50) points :)

Here should be graph.

Hacks and possible hacks description

496A - Минимальная сложность

Here should be graph.

496B - Секретный код

Here should be graph.

496C - Удаление столбцов

Here should be graph.

496D - Игра в теннис

Here should be graph.

496E - Распределение партий

Here should be graph.

Fastest hackers

Problem Time Hacker Defender Hack
496B - Секретный код 1:28:16 Shahzodbek Chaves 129950
496C - Удаление столбцов 0:54:36 vishwacs111 mkisic 129848
496D - Игра в теннис 1:47:13 ChoeWonHyok voidmax 130035

Because of lack of hacks overall, we listed below everybody with positive score ;)

Best hackers

Hacker Stats Successful hacks Unsuccessful hacks
vishwacs111 +2-1 (150) C: 129848 129851
C: 129845
Pifagorka +1-0 (100) B: 130019

Karnah +1-0 (100) C: 129909

Shahzodbek +1-1 (50)
B: 129950
A: 129843

ChoeWonHyok +1-1 (50) D: 130035
D: 130028
bunos +1-1 (50) C: 130015
C: 130068

Best rooms

Room #hacks Hackers
8 3 vishwacs111 [2], AkshajK [1]
35 1 Shavkat_Aminov [1]
84 1 ChoeWonHyok [1]
7 1 Shahzodbek [1]
39 1 Karnah [1]
61 1 Pifagorka [1]
15 1 bunos [1]

Best countries

Country #hacks Hackers
India 2 vishwacs111 [2]
Uzbekistan 2 Shahzodbek [1], Shavkat_Aminov [1]
Russia 2 bunos [1], Karnah [1]
United States (USA) 1 AkshajK [1]
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10 years ago, # |
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I think this contest wasn't good for hacking... It wasn't an standard contest :(