Arpa's blog

By Arpa, history, 6 weeks ago, In English

Hi!

CLIS (Competitive Learning Institute Symposium) is one of the programs at ICPC World Finals every year. As you know ICPC World Finals '20 is going to be held in ~2 weeks in Moscow. I had two proposals for the symposium that both accepted. Abstract of one of them goes as follow:

We're not good in our jobs?

Peter Norvig: "One thing that I can share that was surprising to me is: being a winner of one of these programming contests was actually a negative factor for performing well on the job.",
What does it mean? We're performing badly on our jobs? If so, why?
In this presentation, I'm going to take a survey of competitive programmers on their job.

  • As a teacher, how to make CP as close as possible to the job?
  • What happens in CP and what happens on the job, why they are different?
  • What're the main abilities that CP makes them grow and what are the abilities needed on the job?
  • Is the salary of competitive programmers more than others after several years?
  • Which technologies (e. g. Networking, AI, IoT) are more close to CP?
  • What are the most important negative factors of competitive programmers, in sight of their managers on their job?
I'll do several interviews with old competitive programmers who are doing their job good and ask for their experience for better presentation.

As here is the biggest competitive programming community, can you please share your experience with me? For example,

  • If you were a competitive programmer and you're now working in a company, which abilities you're using from CP?
  • If you're a human resource specialist, can you please answer this question: Is the salary of competitive programmers more than others after several years?
  • If you're a team lead and have someone in your team that is a competitive programmer, how do you evaluate him? Are you satisfied?

PS. If you're a WF attendee, I'll be very thankful if you attend my presentation.

Update. The presentation is over. You can download the slides and watch the presentation.

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By Arpa, history, 3 months ago, In English

Hi.

I recommend everyone to participate in Iranian Combinatorics Olympiad.

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By Arpa, history, 8 months ago, In English

Hi!

Check out my interview with Natalia.

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By Arpa, history, 8 months ago, In English

Hello Codeforces!

Every month, there will be a problem with complete explanations and solutions for one of the month's problems. Here is the problem of February. Feel free to ask me questions and suggesting edits.

Please help me by proposing a problem for the next month. In the November contests, look for a challenging problem that you would like to have complete explanations of it.

Also, what do you think about video tutorials instead of text editorial?

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By Arpa, history, 12 months ago, In English

Yes! I’m back with the problem of the month series, hosted by Topcoder.

Every month, there will be a problem with complete explanations and solutions for one of the problems of the month. Here is the problem of October. Feel free to ask me questions and suggesting edits.

Help me by proposing a problem for the next month. In the November contests, look for a challenging problem that you would like to have complete explanations of it.

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By Arpa, history, 16 months ago, In English

Hello, Codeforces community!

I am very proud to announce SRM 787 is underway, authored by me. The contest will start today at 16:00 UTC.

It is my third experience in holding a contest at Topcoder. Holding contests on Topcoder is always memorable, having misof as contest coordinator and hmehta as a kind helper, it can't be nice more. Although struggling with Java and MPSQAS is not easy, being with a kind and professional team makes it sweet. So thank you Misof and Harshit! Also, Misof tested the contest.

Problem stories are all about my honorable mighty teacher, Abolfazl Asadi, who is currently doing great in teaching students and preparing them for INOI (Iran National Olympiad of Informatics). You will know him in problem statements as "Aqa Asadi". "Aqa" means "Sir" in Persian.

Abolfazl Asadi

I can't skip thanking my dear friend Javad javaD Karimi, who proposed the idea of Div. 1 Easy.

P. S. Please note that the coding phase will begin at 16:05 UTC but the registration will still close at 15:55 UTC.

Good luck to everyone!

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By Arpa, history, 18 months ago, In English

I'm honored to introduce you to the article series, Arpa's problem of the month, hosted by Topcoder.

Every month, there will be a problem with complete explanations and solutions for one of the problems of the month. Here is the problem of April. Feel free to ask me questions and suggesting edits.

Help me by proposing a problem for the next month. In the May contests, look for a challenging problem that you would like to have complete explanations of it.

P. S. "Arpa's problem of April" is something rhythmic, isn't it?

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By Arpa, history, 18 months ago, In English

Here is the link to the editorial. Feel free to discuss problems and ask me questions. I'll be glad to improve the editorial with your comments.

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By Arpa, history, 19 months ago, In English

Here is the link to the editorial. Feel free to discuss problems and ask me questions. I'll be glad to improve the editorial with your comments.

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By Arpa, history, 19 months ago, In English

Hi, Codeforces community.

Today is the first day of the Persian new year (1399), we call it Nowruz. I wish everyone bug-less codes, high ratings, branded T-shirts, and, successful hacks. Also, I hope no one gets failed on system testing, no hacks after locking, and no tiredness of coding.

I'd like to finish the post with a poem:

 برآمد باد صبح و بوی نوروز

به کام دوستان و بخت پیروز

نکویی کن که دولت بینی از بخت

مبر فرمان بدگوی بدآموز

By: Saadi.

Translation:

The morning breeze and Nowrooz (new year) scent have started to blow,

Onto the friends' desire and the triumphant fortune,

Do good deeds to get goods from the world,

Don't obey malicious people.

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By Arpa, history, 19 months ago, In English

Here is the link to the editorial. Feel free to discuss problems and ask me questions. I'll be glad to improve the editorial with your comments.

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By Arpa, history, 20 months ago, In English

Here is the link to the editorial. Feel free to discuss problems and ask me questions. I'll be glad to improve the editorial with your comments.

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By Arpa, history, 20 months ago, In English

Hi.

I used this blog and created a user list of ICPC World Finals 2020 participants. Here is the link.

For example, you can use it for filtering the scoreboards. Here is the filtered scoreboard of yesterday's contest.

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By Arpa, history, 20 months ago, In English

Hi.

Here is the link to the editorial. Feel free to discuss problems here and ask me questions.

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By Arpa, history, 20 months ago, In English

Hi.

Here is the link to the editorial. Feel free to discuss problems here and ask me questions.

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By Arpa, history, 20 months ago, In English

Hi.

Check this blog at the first. We've modified our problem selection process. Now you can use this form to submit ideas. If you submitted a problem on Ninja-Setters, send it again through this form, I can't access Ninja-Setters anymore.

Still, we need approximation problems (although it doesn't mean we don't need other problems), please submit them if you have any.

If you have questions, please send an email to me (a.poorakhavan@gmail.com) or ask in the comments. Please do not message me here.

Update (May 21): Nowadays we prefer full contest proposals instead of single submissions to the Google form mentioned above. Send your full set to me through email. Specify the contest (Easy/DSA/Circuits) in the subject. If you previously sent your problems through the form above, mention it.

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By Arpa, history, 2 years ago, In English

Hi!

I'm here to introduce a new series of contests on HackerEarth, Data Structures and Algorithms (DSA) coding challenge! In this series, you will have to solve 3 problems in 1.5 hours.

The problems are classic and educational as against being creative and challenging. So, if you're learning new things, don't miss the DSA contests. These contests are similar to Codeforces Educational rounds.

We have hard problems and easy problems in this contest. After the contest, don't forget to upsolve! This will help you a lot.

The next DSA contest is on September 14, 4 AM UTC.

Authors are Devarshi (devarshi09) Khanna, Prakash (forgotter) Jha, and, Aditya (aditya123garg) Garg. I'm the tester of the round.

GL & HF!

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By Arpa, history, 2 years ago, In English

Please read this blog as an update.

Hi everyone.

I want to describe the process to become a problem setter on HackerEarth. I'm eager to see new problem setters want to prepare contests. It's a great experience for every coder to hold a contest at least once. The first time when I prepared a contest (I was fifteen at that time, a high schooler student!) it was so sweet for me that I continued preparing problems on Codeforces, CodeChef, HackerEarth, Quera, Iran Olympiad of Informatics Finals and several more. Then I worked for 1.5 years in Quera as the contest coordinator, which was great. I'm continuing my job — Contest Coordinating — on HackerEarth from January.

We have three algorithmic contest every month, here is the table:

Contest Number of problems Approximate Difficulty Length Comments
Easy 6 Like Codeforces Div. 2 3 Hours
DS and Algo challenge 3 Easy to Medium-Hard 1.5 Hour
Circuits 8 One approximate problem and 7 algorithmic, from Very-Easy to Hard 9 Days More educational, less competitive, we could use classical problems

As you can see, we need a lot of problems every month. To propose a problem, follow this instruction:

  • Register on Ninja Setters platform. where you can write your proposal.
  • I'll check your problem soon. If approved, you should prepare test cases, solution.
  • We'll have you in a contest!

Our proposal queue is almost empty, so if you propose a problem today, with a high probability, your problem will be used in August contests. Here is the compensation table:

S. No. 
Difficulty 
level 
Indian setters (INR) 
International setters (USD) 
1 
Very Easy 
1600 
23 
2 
Easy 
2300 
35 
3 
Easy-Medium 
3000 
45 
4 
Medium 
4700 
70 
5 
Medium-Hard 
6000 
90 
6 
Hard 
8000 
120 
7 
Approx. 
8000 
120 

P. S. You don't need to prepare the whole contest. A contest may have many setters, so even if you send one problem, it's welcomed.

P. S. We need an approximation problem every month. Propose it if you have some. Check the last Circuits contest for an example.

Update. It's not needed to send me a message when you register on Ninja Setters, just wait for several days, I'll add you to group such that you can start proposing problems.

Update. Users with rating less than 1600 can propose problems but the probability of acceptance is low.

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By Arpa, history, 2 years ago, In English

Hello everyone!

Another long and exciting contest is here, June Circuits '19, a challenging challenge with 8 amazing problems, should be solved in 9 days. The contest will start on June 21, 15:30 PM UTC.

Thanks to problem setters for doing such a fantastic job, we have 7 setters involved this time (!):

I'm tester of the round, I'm completely sure that you'll enjoy too!

To make the challenge more interesting, we will add problems to the contest in this order:

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

As usual, there will be some sweet 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 on the leaderboard!

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By Arpa, history, 2 years ago, In English

Hi all!

Happy Eid Fitr to all Muslims in the Codeforces community.

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By Arpa, history, 2 years ago, In English

Hello!

Welcome to June Easy '19, from our easy and educational contest series. It's a 3-hour competition with six algorithmic tasks. We are going to hold it on Sunday at 16:00 GMT. Check contest page for more details.

I helped Danylo Danylo99 Mocherniuk, Mohammad-Mahdi Kerpoo Taheri, and, Dishant Dishant_18 Trivedi setting this round. AmirHossein amsen Pashaee and I are testers of the contest. As usual, here are the prizes for the top three contestants:

  • $75 Amazon gift card
  • $50 Amazon gift card
  • $25 Amazon gift card

Note that prizes and T-shirts are given to top participants with ratings < 1600 (beginners).

GL & HF.

Let's discuss the problems after the contest!

P. S. Sorry for problems occurred. Now everything fixed.

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By Arpa, history, 2 years ago, In English

Hello everyone!

Another long and exciting contest is here, May Circuits '19, a challenging challenge with 8 amazing problems, should be solved in 10 days. The contest will start on May 24, 15:30 PM UTC.

Thanks to problem setters for doing such a fantastic job, we have:

  • Four problems from Kasra KMAASZRAA Mazaheri.
  • A problem from Danylo Danylo99 Mocherniuk.

Also, I helped them by adding three problems.

Contest Banner

I, Danial Danial Erfanian, and, Javad javaD Karimi were the testers of the round, and we enjoyed solving problems, we're entirely sure that you'll enjoy too!

To make the challenge more interesting, we will add problems to the contest in this order:

  • Day 0: Very-Easy, Easy-medium, Approximation.
  • Day 1: Easy-Medium, Easy-medium.
  • Day 4: Medium-Hard, Medium-Hard.
  • Day 6: Hard.

As usual, there will be some sweet 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!

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By Arpa, history, 3 years ago, In English

Hello!

I'm honored to invite you to April Easy '19; it's a 3-hour competition with 6 algorithmic tasks. We are going to hold it on Saturday (Today) at 16:00 GMT (you can check your timezone here). Check contest page for more details about in-contest schedule and rules.

AghaTizi is the setter of this round and Aryan is the tester of problems. As usual, here are the prizes for the top three contestants:

  • $75 Amazon gift card
  • $50 Amazon gift card
  • $25 Amazon gift card

Note that prizes and T-shirts are given to top participants with ratings < 1600 (beginners).

GL & HF.

Let's discuss the problems after the contest!

P.S. Sorry for the late announcement.

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By Arpa, history, 3 years ago, In English

Hello everyone!

As the new contest coordinator in HackerEarth, I'm honored to announce, we're here with the new version of circuits contests, March Circuits '19, a challenging challenge with 8 amazing problems, should be solved in 10 days. The contest will start on March 22, 15:30 PM UCT.

This time setters around the world helped us make this round possible. We have:

Contest Banner

I was the tester of the round and enjoyed solving problems, I'm sure that you'll enjoy too!

To make the challenge more interesting, problems added to the contest in this order:

  • Day 0: Very-Easy, Easy, Approximation.
  • Day 1: Easy-Medium, Medium.
  • Day 4: Medium, Medium-Hard.
  • Day 6: Medium-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!

Good Luck & Have Fun ;)

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By Arpa, history, 3 years ago, In English

Hello!

As the new Contest Coordinator at HackerEarth, I'm honored to invite you to HackerEarth HourStorm #8; it's a 1-hour competition with 3 traditional (but nice) algorithmic tasks. We are going to hold it on Friday at 14:30 GMT (you can check the time here.

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. Check contest page for more details about in-contest schedule and rules.

MazzForces is the setter of this round and I'm the tester of problems. Prepared problems were interesting and I enjoyed solving them, I hope you find them interesting too. As usual, here are the prizes for the top three contestants:

  • $75 Amazon gift card
  • $50 Amazon gift card
  • $25 Amazon gift card

In addition, the top 5 will win HackerEarth t-shirts.

GL & HF.

Let's discuss the problems after the contest!

P.S. I'm sorry for the problem occurred on problem B (A counting problem). I was the tester of this contest; the problem was Anand has changed test cases and didn't run my solution on test cases again and his solution has a little bug, so test cases 17-29 were wrong. We apologize for this problem. Now rejudge is done.

Here are the winners:

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