pani.natalia's blog

By pani.natalia, 3 weeks ago, In English

I know we can filter contest results to show only friends. But MikeMirzayanov has 6554 friends and as far as I know does not participate into contests. So does it mean something special to have a lot of friends on CF?

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By pani.natalia, 5 weeks ago, In English

Country and city in Codeforces user profiles are often not a the place of the residence but a state of mind. I am sure those 197 users who selected Antarctica as their country feel that their surrounding is cold. Or cool ) The map below shows data from user profiles which have both country and city. So only 16 of all antarctic profiles were taken into consideration, because other have empty city field.
On 27 June 2021 there were 351898 users in the rating list. 88752 profiles contained both country and city. There were 4162 unique values of City field for 180 unique values for Country field. The size of circle is proportional to user number and different colors are used to divide cities on groups with the following numbers of users: <20, 20-99, 100 -249, 250-999, >1000.
 .

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By pani.natalia, 7 weeks ago, In English

SimilarWeb is a platform for web analytics. It allows you to collect data for any sites even when you are not their owner. It is an expensive tool but some features are available for free for the start period. When I tested how it worked naturally I chose 'Codeforces.com' for my exercises:-)

The very first picture surprised me.

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By pani.natalia, 2 months ago, In English

Please meet my today’s guest Ali Ibrahim C137 from Syria. We will be talking about competitive programming in times of war and peace.

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By pani.natalia, 2 months ago, In English

I ran my code on 28 May 2021. There were 345553 users in rating list. 87427 of them set field City in their profiles. There are 4009 unique values. Certainly some profiles might have fake values but anyway it is interesting to look at all these points on the map. Cities are marked by circle if there is at least one Codeforces user profile with this city name.

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By pani.natalia, 3 months ago, In English

Please meet my today's guest Anatoly ruban, PhD in Physics and Mathematics, who yesterday participated in his 700th contest on Codeforces.

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By pani.natalia, history, 3 months ago, In English

The plot shows correlation between number of contests and max rating of a user for all (included inactive) users.
Changing in calculating rate for newcomers are easily to remark.
Although there is no correlation between number of contests and max rating I am mesmerized by people who have great number of contests. The diagram shows that their results are really outstanding.

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By pani.natalia, 4 months ago, In English

At the beginning of March 2021 there were 324234 user profiles in the ranking list on Codeforces (my code on GitHub). About a quarter of them (81918 users) took part only in 1 contest.

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By pani.natalia, 5 months ago, In English

Now (13 March 2021) there are 6786 problems on Codeforces (my code on GitHub). 142 of them have no rating. What is problem complexity distribution for 6646 problems which have rating?

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By pani.natalia, 5 months ago, In English

What was the most popular day of week for contests?

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By pani.natalia, 5 months ago, In English

Arpa's interview:

-Salam AmirReza
-Salam Natalia

-Do you remember becoming red?
-Yes, exactly one year ago, for the first time, I touched red just with 2405 :))

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By pani.natalia, 5 months ago, translation, In English

As I wrote before only 1622 profiles on Codeforces have in their history a rating more than 2400 (February 2021). How many days are between the contest where a user became red and his first contests?

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By pani.natalia, 5 months ago, In English

The most popular question on Codeforces must be "How to become red".
I've just (February 2021) ran a script and discovered that the current number of Codeforces profiles is 323553. Only 1622 profiles have in their history a rating more than 2400.

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