ivan.popelyshev's blog

Facebook hackercup final
By ivan.popelyshev, 13 years ago, In English
We need the new thread specially for the final.

21:00 MSK (less than in a hour).

scoreboard

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Topcoder SRM 498
By ivan.popelyshev, 13 years ago, translation, In English
SRM 498 will be held at 26 february 17:00 GMT. Good luck, have fun!
And may The Force be with you.

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SRM 490
By ivan.popelyshev, 13 years ago, translation, In English
Discuss SRM 490 there.

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Greenfoot and the Jedi Tetris
By ivan.popelyshev, 14 years ago, translation, In English
I am working as a teacher in Lyceum Fryazino.

I decided to teach my computer science group to code Java programs. As a learning IDE i chose Greenfoot.

I will write a post in my blog about this IDE soon. Last evening i made this:

Jedi tetris.

My score is 9100.

P.S.
Thanks to "Export" button i uploaded my scenario to the web-site as a java applet.

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ACM Server
By ivan.popelyshev, 14 years ago, translation, In English

Intro

Every high school or college coach quickly comes to mind about his own online judge system. We can deal with huge systems like  e-judge or pcmc-2, we can make something our own like contester or acmp, but in any case to create a contest we should

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Codeforces Beta Round #2 - Another Tutorial
By ivan.popelyshev, 14 years ago, translation, In English
Lets start from the end.

Problem С. Commentator problem

Let R be the distance from point А to a circle with center О and radius r. From this point the circle is observed at the angle .
So, the three stadiums are observed at the same angle if R1 / r1 = R2 / r2 = R3 / r3.
Take two different points A, B. The set of points C that AC / BC = const is either a line (perpendicular bisector of AB) or a circle with center somewhere on the line AB. This circle is easy to find. It contains two points that lie on AB and satisfy AC / BC condition.

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