nocriz's blog

By nocriz, history, 4 weeks ago, In English

On many training camps for ICPC there are ratings like this where the first team is rated 200.

Is it possible for me to calculate this rating for my university's internal training? How is this rating calculated? Is there a rating calculator?

Thanks Codeforces!

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By nocriz, history, 2 months ago, In English

The next codeforces round will end on 02:35 UTC+8, which is quite late for people in east asia.

I searched in contests for the last contest which is ending late, and it was VK Cup 2019-2020 — Elimination Round or Codeforces Round #623 , which was 16 months ago. That contest started 00:35 UTC+8 and ends 02:35 UTC+8.

Yeah — just pointing out some fact, I might still participate in the contest.

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By nocriz, history, 3 months ago, In English

This blog is perhaps complete nonsense because becoming faster is perhaps equal to generally becoming better at competitive programming. I've found that many hard problems are approachable if given a longer time and that it is possible to get a decent ranking (perhaps ranked 5-15, since I am not that fast I cant) in many contests for just being fast. Solving problems faster also mean more time to spend on the problems few contestants solves.

So, how can I get faster? I believe the general answer will be "solve more problems" or "Practice more", but can anyone give some more concrete clue?

Sorry for posting this nonsense blog.

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By nocriz, history, 6 months ago, In English

A question I always wanted to ask, and has never seen a plausible answer:

Why is ICPC not sponsored by ACM since 2019?

Anyone has some ideas or information?

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By nocriz, history, 7 months ago, In English

According to the Bill's answer Here:

Where and when will the ICPC World Finals 2021 take place?

Answer

So, there is 15 months left to the WF...... Not sure what I will be doing 15 months later.

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By nocriz, history, 8 months ago, In English

Hello Codeforces:

Many users on codeforces are uploading screencasts to youtube. During my past years as a participant, I never watched much screencast, and I think the same is true for many of my friends. Screencast just isn't popular or widespread among Chinese OI or ICPC participants.

So, though I found that these are truly valuable videos for improving performance, I still don't fell sure about how I should watch them. How are screencasts supposed to work? Should I watch one from begin to end for 2+ hours? What are the benefits and how can I get the most out of screencasts?

Thanks!

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By nocriz, 20 months ago, In English
1262A - Math Problem

Writer: RDDCCD

Tutorial
1262B - Box

Writer: RDDCCD

Tutorial
1261A - Messy

Writer: RDDCCD

Tutorial
1261B1 - Optimal Subsequences (Easy Version)

Writer: MikeMirzayanov

Tutorial
1261B2 - Optimal Subsequences (Hard Version)

Writer: MikeMirzayanov

Tutorial
1261C - Arson In Berland Forest

Writers: BledDest, adedalic

Tutorial
1261D1 - Wrong Answer on test 233 (Easy Version)

Writer: RDDCCD

Tutorial
1261D2 - Wrong Answer on test 233 (Hard Version)

Writer: RDDCCD

Tutorial
1261E - Not Same

Writers: nocriz, RDDCCD

Tutorial
1261F - Xor-Set

Writer: nocriz

Tutorial

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By nocriz, history, 21 month(s) ago, In English

Hello, Codeforces!

A few days ago, the blog about the book "Looking for a challenge 2" was posted on Codeforces, I read a quarter of the book and found that the quality was really good. I talked with a few friends about the book and we decided to buy the popular book "Looking for a challenge 1", which should be good as well. At first we considered buying a paperback version, but it was quite expensive and I'm afraid that some problems may occur during the shipment from Poland to China.

After a few days I found the book "Looking for a challenge" was available as a e-book (pdf) on the website "http://ibuk.pl" for 66,50 zł, the cheapest I can find on the internet. Although I can't read Polish, I used Google translate to buy the book. After I purchased the book with a master card, I was able to download the pdf version of the book. With the excitement, I started to download the book. The internet speed was about 100 Kbyte per second, and the book was about 60MB. I thought that my Internet was too slow, so I changed the network connection a few times and refreshed. After that, I found that I reached the download limit, and was not able to download anymore.

So, the situation is that I spent 66,50 zł (about 17.5 US Dollars) for nothing, since I can't download anymore and I never finished downloading even once. I was really depressed since it is quite a large sum of money for me, and that I still don't have the book. I tried to e-mail the website (using google translate, of course). I figured that there may be Polish participants on Codeforces who knows about the website ibuk.pl or similar situations, so I posted this blog to ask for help. What should I do? Is it likely that the website will let me download again or send me the book? Who else can I contact in this situation?

I'm grateful for any of your help! Thank you!

UPD : I received the reply three days later and got the PDF now! Thanks everyone.

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By nocriz, history, 22 months ago, In English

TopCoder has been a famous competitive programming platform and I've heard of TopCoder for years. I've never participated in TopCoder rounds though. Like many of my friends, I started to really participate in online rounds since 2018, and Topcoder's fame already seemed to fade.

Last year, I did attempt to participate in a SRM, but I met various difficulties. Possibly I'm not clever enough but participating in SRM is indeed much complicated than participating a Codeforces Round.

  • The java applet was confusing.
  • I didn't know where to find the time of the next SRM. Although I saw posts of SRM announcements on Codeforces, it is usually the day after the round.
  • The TopCoder website didn't seem like a competitive programming website.

In the end, I didn't success in participating in any SRM. A few days ago, I finally find the current Topcoder Competitive Programming Page with the future contest time, solution, problem archive etc. The Link. (Last year, all I found was the arena. That was indeed confusing to me, I never imagined that there is a separate page.) It is finally possible for me to start participating in TopCoder, but I found that on TopCoder, SRM participants in 2019 are typically ~300, while a few years ago there were ~2000 people in a single round.

I'm a bit worried that TopCoder is dying and start participating on a new platform is probably not a good idea for me, and that I will encounter more difficulties or that there will be even less or none participant in the future. However, I heard that the problems were good, Is it true? What are your suggestions for someone that wants to participate in TopCoder Contests in late 2019 to make it easier?

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