Tag Archives: LunchTime


Codechef June Lunchtime 2017

On Saturday, Codechef June Lunchtime 2017 took place. I wrote the editorials for the contest and have to tell you that at least 2 problems were quite interesting, and one of them exceptionally hard! If you take a look at the final standings, you'll see that only 3 people solved all problems during the contest, and we had very strong participants as usual. My bet was that nobody will solve it, but fortunately, I was wrong :)

If you didn't participate and want to practice problem-solving skills, I recommend trying COMPCLUB problem, or if you want something really hard, then try SHDWCMP.

My editorials are available here.


December Lunchtime - my first Codechef contest

I'm happy to announce upcoming Codechef December Lunchtime as the setter of all the problems in the contest. This is my first contest on Codechef and for sure not the last one :D

The contest starts on Saturday December 31 and have 4 problems to solve, 2 easier and 2 harder ones. Some graph theory might be useful while trying to solve them ;) If you want to finish the year strong, this is a nice possibility.

After the contest my editorials will be posted on discuss.codechef.com as always.

Happy coding and good luck!


CodeChef September Lunchtime

A good news for all of us interested in practicing problem solving. September Lunchtime 2016 is coming. It takes place on Saturday 16:00 CEST and will last 3 hours and 30 minutes (check other timezone).

Problem set is prepared by Misha Chorniy and tested by Sergey Kulik. The contest has four brain-teasing problems which will make your weekend thrilling. My task is to write detailed editorials for all of you.

Joining us on the problem setting panel are: Mandarin Translator: Hu Zecong, Vietnamese Translator: VNOI Team, Contest Admin: Praveen Dhinwa

Moreover, Top 10 school students each from Global and Indian category will get CodeChef laddus, with which the winners can claim cool CodeChef goodies. Know more here: https://www.codechef.com/laddu.  (For those who have not yet got their previous winning, please send an email to winners@codechef.com).


Good Luck and see you on Leaderboard!



CodeChef August Lunchtime


CodeChef August Lunchtime starts in an hour. I'm the author of all editorials to the problem set and I can assure you that all the problems are interesting to solve. There is one cakewalk problem and 3 harder ones of various difficulties, so anyone should be pleased, especially those ones interested in graph theory :)

All the editorials will be available after the contest here: https://discuss.codechef.com/tags/ltime39

See you on leaderboards!

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January Lunchtime 2016 on CodeChef

January Lunchtime 2016 has just finished. The problems used there are so great, that I have to let you know about them! 

The most amazing problem in my opinion is the one involving Dilworth's Theorem, check it out: Table Covering

I wrote all editorials to the problems, they are very descriptive and detailed and are available here: editorials.