### chemthan's blog

By chemthan, history, 11 months ago,

We invite you to participate in CodeChef’s June Lunchtime, this Saturday, 27th June, from 7:30 pm to 10:30 pm IST.

3 hours, 5 problems.

We will also be hosting a live problem discussion sessions where our panelist, RestingRajarshi will discuss the Lunchtime problems on 28th June 4 pm to 6 pm IST. Find more details here.

Also, if you have some original and engaging problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here. Joining me on the problem setting panel are:

Prizes:

Top 10 Indian and top 10 Global school students from ranklist will receive certificates and CodeChef laddus, with which they can claim cool CodeChef goodies. Know more here.

Good luck and have fun!

• +48

By chemthan, history, 17 months ago,
Python Solution

Author: isaf27, prepare laoriu, I_love_Hoang_Yen

C++ solution

Author: isaf27, prepare isaf27

C++ solution

Author: MikeMirzayanov, prepare MikeMirzayanov

C++ Solution

Author: laoriu, prepare laoriu, I_love_Hoang_Yen

C++ Solution

Author: chemthan, prepare laoriu, I_love_Hoang_Yen

C++ Solution

Author: chemthan, prepare laoriu, I_love_Hoang_Yen

C++ Solution

Author: chemthan, prepare laoriu, I_love_Hoang_Yen

C++ Solution

Author: chemthan, prepare laoriu, I_love_Hoang_Yen

C++ Solution

Author: chemthan, prepare laoriu, I_love_Hoang_Yen

Another cool problem: WEICOM.

Python Solution

Author: chemthan, prepare laoriu, I_love_Hoang_Yen

Bonus: another beautiful problem.

• +55

By chemthan, 17 months ago,

Hello everyone!

I am glad to invite you to Codeforces Round #604, which will take place on Dec/05/2019 17:35 (Moscow time). The round will be rated for both divisions.

Exactly 300 Codeforces rounds passed since my first one (Round 304). I have learned a lot of things here and have much fun in participating in the competitions. Now, I want to contribute to this community by proposing some problems. I hope that you will find something interesting in solving them.

The contest is prepared by me, laoriu, I_love_Hoang_Yen, coordinator isaf27 and CF admin MikeMirzayanov. As usually, we must specially thank to below people who make contest possible:

There will be roughly 6 problems in each division. Scoring will be announced later.

GL & HF! See you on the scoreboard.

UPD 1: Scoring

• D1: 500 1000 1500 (1000+1000) 2250 3000.
• D2: 500 1000 1500 2000 2000 2500.

UPD 2: Thanks for participating! Congratulations to the winners!

Top 5 Div1:

Top 5 Div2:

UPD 3: Sorry for delay, this is editorial.

• +362

By chemthan, history, 2 years ago,

Hello everyone!

I would like to invite you to participate in February Circuits '19. It's a long contest that will start on Feb 15, 9:00 PM IST (check you timezone). Contest will run for 9 days.

The problem set consists of 7 traditional algorithmic tasks of various difficulties and 1 approximate problem. For traditional algorithmic tasks, you will receive points for every test case your solution passes — so you can get some points with partial solutions as well. For the approximation task, your score depends on the best solution in the contest so far. Check contest page for more details about in-contest schedule and rules.

I'm the tester and Alpha_Q, aminul, Apptica is the setters. I would like to thank HackerEarth admin panel, without them we do not have such contests. Below is the detail of problem set:

• Day-0: Easy, Easy-medium, Approximate.
• Day-2: Easy-Medium, Medium.
• Day-4: Medium, Medium-hard.
• Day-6: Hard.

As usual, there will be some nice prizes for the top five competitors:

• First place: $100 Amazon gift card + HE t-shirt. • Second place:$75 Amazon gift card + HE t-shirt.
• Third place: $50 Amazon gift card + HE t-shirt. • Fourth place: HE t-shirt. • Fifth place: HE t-shirt. Hope to see you at the scoreboard! GL & HF. UPD: Congratulations to the winners Read more » • +39 By chemthan, history, 2 years ago, Hello Codeforces community, Since my contribution is gradually decreasing, it is time to stop it :) I would like to invite you to join HackerEarth's January Easy '19 which will start at 15:30 UTC, January 6, 2019. The problems are prepared by aashrayagarwal, kingofbugs and me and tested by zscoder. I hope you'll find the problemset to be interesting. You will be given 5 algorithmic problems to solve in 3 hours. Partial scoring will be used (you get points for passing each test case). Although the contest is targeted towards beginners, we hope even experienced problem-solvers find one or two problems to be interesting. The contest is rated and prizes will be awarded to the top 3 beginners (i.e. programmers with a rating of 1600 or less before the challenge starts). • First place:$75 Amazon gift card.
• Second place: $50 Amazon gift card. • Third place:$25 Amazon gift card.

Good luck & have fun!

• +60

By chemthan, history, 3 years ago,

Hello everyone!

I would like to invite you to participate in July Circuits '18. It's a long contest that will start on Jul 20, 9:00 PM IST (check you timezone). Contest will run for 9 days.

The problem set consists of 7 traditional algorithmic tasks of various difficulties and 1 approximate problem. For traditional algorithmic tasks, you will receive points for every test case your solution passes — so you can get some points with partial solutions as well. For the approximation task, your score depends on the best solution in the contest so far. Check contest page for more details about in-contest schedule and rules.

I'm the setter and Lewin is the tester. I would like to thank HackerEarth admin panel, without them we do not have such contests. Below is the detail of problem set:

• Day-0: Very-Easy, Easy-medium, Approximate.
• Day-2: Medium, Medium-hard.
• Day-4: Medium-hard, Hard.
• Day-6: Hard.

As usual, there will be some nice prizes for the top five competitors:

• First place: $100 Amazon gift card + HE t-shirt. • Second place:$75 Amazon gift card + HE t-shirt.
• Third place: $50 Amazon gift card + HE t-shirt. • Fourth place: HE t-shirt. • Fifth place: HE t-shirt. Hope to see you at the scoreboard! GL & HF. Read more » • +68 By chemthan, history, 3 years ago, Hello everyone! I would like to invite you to participate in April Circuits '18. It's a long contest that will start on Apr 21, 9:00 PM IST (check you timezone). Contest will run for 9 days. The problem set consists of 7 traditional algorithmic tasks of various difficulties and 1 approximate problem. For traditional algorithmic tasks, you will receive points for every test case your solution passes — so you can get some points with partial solutions as well. For the approximation task, your score depends on the best solution in the contest so far. Check contest page for more details about in-contest schedule and rules. I'm the tester and webmaster is the setter. I would like to thank HackerEarth admin panel, without them we do not have such contests. Below is the detail of problem set: • Day-0: Easy, Easy-medium, Approximate. • Day-2: Easy-Medium, Medium. • Day-4: Medium, Medium-hard. • Day-6: Hard. As usual, there will be some nice prizes for the top five competitors: • First place:$100 Amazon gift card + HE t-shirt.
• Second place: $75 Amazon gift card + HE t-shirt. • Third place:$50 Amazon gift card + HE t-shirt.
• Fourth place: HE t-shirt.
• Fifth place: HE t-shirt.

Hope to see you at the scoreboard! GL & HF.

• +53

By chemthan, history, 3 years ago,

Hello CodeForces Community!

To keep the coding clock ticking, we have some interesting challenges in the upcoming December Cook-Off. Joining me on the problem setting panel are:

All statements are short and clear. I hope you will enjoy solving them. Please give your feedback on the problem set in the comments below, after the contest.

Contest Details:

Time: 24th December 2017 (2130 hrs) to 25th December 2017 (0000 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone.

Registration: You just need to have a CodeChef handle to participate. For all those, who are interested and do not have a CodeChef handle, are requested to register in order to participate.

Prizes:

• Top 10 performers in 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! Hope to see you participating!!