I will be hosting Petr Mitrichev Contest 10 this Saturday (October 27) between 15:30 and 20:30 Moscow time (other timezones: http://timeanddate.com/worldclock/fixedtime.html?msg=Petr+Mitrichev+Contest+10&iso=20121027T1530&p1=166&ah=5 ).

The contest will be held at http://mirror.codeforces.com/gyms . Both teams and individual participants can join. The contest itself will be at http://mirror.codeforces.com/gym/100110 , but this link will be accessible only after the start of the contest.

There will be 10 problems of varying difficulty (most are quite difficult) for 5 hours. Your solution needs to be correct on all test cases to be accepted (the standard ACM ICPC rules). People will be ranked by the number of solved problems, and by total penalty time in case they're tied on solved problems, so don't be late! :) Note that in each problem you need to read the input from a file and write the output to another file — so don't read from stdin and don't write to stdout! Problem statements will be in English.

Feel free to ask any questions that you might have, and also please tell if there are any issues with the contest system — it's the first time I'm using codeforces.com/gyms .

Registration: http://mirror.codeforces.com/gymRegistration/100110

5 minutes before start, good luck everyone!

Solution ideas: http://petr-mitrichev.blogspot.com/2012/10/petr-mitrichev-contest-10-solution-ideas.html

There will be an online contest called Petr Mitrichev Contest 10. Problems are all mine, previously used in Petrozavodsk trainings for top Russian teams this September but not published elsewhere. The problems are not easy, but they are of different types and thus I hope everyone will find something interesting to solve. Both teams and individual participants can join.

I'm trying to choose the best time and place for the contest. My current proposition is: 15:30 to 20:30 Moscow time this Saturday, October 27 (in other timezones: http://timeanddate.com/worldclock/fixedtime.html?msg=Petr+Mitrichev+Contest+10&iso=20121027T1530&p1=166&ah=5 ). Looking at the contest list at http://clist.by/ and the new Yandex contest site not mentioned there (http://contest.yandex.ru/contest/ContestList.html ), all weekends are very busy, but it looks like IFMO trainings are not attended by many teams this fall and thus overlapping with it is OK.

I understand that the contest ending time in my proposition is 1:30AM in Japan and Korea and 0:30AM in China. People from Japan, Korea and China (and from Asia in general): is that too late? I'd host it earlier but there's a contest on acm.timus.ru that ends at 15:00 Moscow time that was very popular last year (http://acm.timus.ru/monitor.aspx?id=100 ), so I fear many contestants from Asia will take part there.

For the venue, I propose http://mirror.codeforces.com/gyms.

Please share your suggestions.

Preview: http://petr-mitrichev.blogspot.com/2012/10/topcoder-open-2012-finals-preview.html

http://petr-mitrichev.blogspot.com/2012/10/topcoder-open-2012-wildcard-commentary.html

http://petr-mitrichev.blogspot.com/2012/10/1239-hi-this-is-live-commentary-for.html

Live commentary at http://petr-mitrichev.blogspot.com/2012/10/topcoder-open-2012-semifinal-1.html. You can ask questions there or here.

http://petr-mitrichev.blogspot.com/2012/05/world-finals-2012-live-coverage.html

http://petr-mitrichev.blogspot.com/2012/05/world-finals-more-coverage.html

I've talked about a problem from today's dress rehearsal in http://petr-mitrichev.blogspot.com/2012/05/world-finals-day-2-upe-dinner.html

Here's the first tough testcase for it: http://petr-mitrichev.blogspot.com/2012/05/power-towers-problem-testcase.html

Good luck! :)

http://petr-mitrichev.blogspot.com/2012/05/world-finals-day-2-upe-dinner.html

http://petr-mitrichev.blogspot.com/2012/05/world-finals-day-2-practice-session.html

http://petr-mitrichev.blogspot.com/2012/05/world-finals-2012-day-1-opening.html

http://petr-mitrichev.blogspot.com/2012/05/day-0-walk-through-warsaw-and.html

http://petr-mitrichev.blogspot.com/2012/05/on-pic-inside-sheremetyevo-airport-im.html

There's a live interview with me, tomek, Onufry Wojtaszczyk and Bartholomew Furrow in 25 minutes: https://plus.google.com/u/0/101571483150813305324/posts/DxaiBoikC8N

UPD. The interview is postponed, I'll write about new date and time :)

Before systest:

1. tomek, problems 1 and 2.
2. Petr, problems 1 and 2.
3. Jacob, problem 3.
4. romanandreev, problem 2.
5. ACRush, problem 2.
6. tomekkulczynski, problem 2.
7. jakubr, problem 2.
8. RAVEman, problem 2.
9. Somebody, problem 3.
10. gawry, problem 1.
11. hos.lyric, problem 1.
12. ilyakor, problem 2.
13. iwiwi, problem 3.
14. Po-Ru Loh, problem 1.
15. vepifanov, problem 2.
16. cerealguy, problem 1.
17. pparys, problem 1.
18. sdya, problem 1.

After systest:

1. romanandreev, problem 2.
2. tomek, problem 1.
3. ACRush, problem 2.
4. gawry, problem 1.
5. hos.lyric, problem 1.
6. Petr, problem 2.
7. cerealguy, problem 1.
8. pparys, problem 1.

Congrats romanandreev!

Preview: http://petr-mitrichev.blogspot.com/2011/09/topcoder-open-2011.html