rng_58's blog

By rng_58, history, 5 years ago, In English

I do this as usual.

HandleCountry
ACRushChina
rng_58Japan
touristBelarus
ksun48Canada
RadewooshPoland
bmerrySouth Africa
EgorGermany
Marcin_smuPoland
molamola.South Korea
dacin21Switzerland
mnbvmarPoland
ecnerwalaUnited States
SpyCheeseRussia
krijgertjeNetherlands
eatmoreRussia
EndagorionRussia
ErrichtoPoland
kevinsogoPhilippines
yutaka1999Japan
aintaSouth Korea
KANRussia
xiaowuc1United States
semiexpJapan
qwerty787788Ukraine
dreamoon_love_AATaiwan

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By rng_58, history, 5 years ago, In English

Has it changed since last year?

Now I can't run it for last year's tasks (Judge return code: 255)

It works fine for this year's tasks.

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By rng_58, history, 5 years ago, In English

We will hold AtCoder Grand Contest 034. This contest counts for GP30 scores.

The point values will be announced later.

We are looking forward to your participation!

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By rng_58, history, 5 years ago, In English

We will hold M-SOLUTIONS Programming Contest.

The point values will be announced later.

We are looking forward to your participation!

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By rng_58, history, 5 years ago, In English

How to solve BCF (preferably in a proved way)?

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By rng_58, history, 6 years ago, In English

diverta 2019 Programming Contest will be held on Saturday (time). The writer is camypaper.

Contest Announcement

Contest duration: 120 minutes

Rated range: <2800

The point values will be announced later.

Let's discuss problems after the contest.

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By rng_58, history, 6 years ago, In English

AtCoder Grand Contest 033 will be held on Saturday (time). The writers are yutaka1999.

This is the third GP30-rated contest in this season — see this post for details.

Contest Announcement

Contest duration: TBD (around 2 hours)

The point values will be announced later.

Let's discuss problems after the contest.

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By rng_58, history, 6 years ago, In English

Tenka1 Programmer Contest 2019 will be held on Saturday (time). The writer is DEGwer.

Contest Announcement

Contest duration: 100 minutes

Rated range: <2800

The point values will be announced later.

Let's discuss problems after the contest.

By the way, we are planning next AGC in one of April 27/28 or May 4/5.

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By rng_58, history, 6 years ago, In English

ExaWizards 2019 will be held on Saturday (time). The writers are semiexp and camypaper.

Contest Announcement

Contest duration: 120 minutes

Rated range: <2800

The point values will be 100 — 200 — 500 — 600 — 700 — 1200.

Let's discuss problems after the contest.

(Note: we noticed that it overlaps with SRM, but this is a sponsored contest and at this moment it's difficult to move it. Sorry about that.)

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By rng_58, history, 6 years ago, In English

AtCoder Grand Contest 032 will be held on Saturday (time). The writers are sugim48 and camypaper.

This is the second GP30-rated contest in this season — see this post for details.

Contest Announcement

Contest duration: 110 minutes

The point values will be announced later.

Let's discuss problems after the contest.

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By rng_58, history, 6 years ago, In English

AtCoder Grand Contest 031 will be held on Saturday (time). There are unusually many writers: yutaka1999, yosupo, DEGwer, maroonrk, hogloid, HIR180. All of them are participating in Oman camp now, and they formed a problemset together.

This is the first GP30-rated contest in this season — see this post for details.

Contest Announcement

Contest duration: TBD

The point values will be announced later.

Let's discuss problems after the contest.

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By rng_58, history, 6 years ago, In English

World Tour Finals 2018/19 has ended, and we will start the new season soon.

The next two contests will be:

UPD: Due to a fatal trouble (namely, the hardest problem turned out to be known) we had to reschedule it. We are very sorry about this.

And these two will be counted for this season's GP30 race. Like last year, the top 8 (or more, in case we get richer) people of the race ranking will be invited to the onsite finals in the beginning of 2020.

There were several requests to increase the number of contests. Currently our goal is to hold

  • 1 AGC or other all-rated contests per month on average (or 12 per year).

  • 2 ARCs or other <2800-rated contests per month on average (or 24 per year).

(This looks like the maximum number I can handle myself).

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By rng_58, history, 6 years ago, In English

We decided to hold a mirror contest of yesterday's finals because there were several requests.

This contest is unrated, but we want to keep it as fair as possible. Please do not participate in case you already know the problems (e.g., participants of Beijing camp), and do not discuss solutions with others during the contest.

This contest is recommended for reds and very ambitious oranges.

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By rng_58, history, 6 years ago, In English

Recently we noticed that the number of international participants to ARC-level contests are declining, so we decided to make announcements here.

When a contest is rated for ~2799, regardless of the name of the contest, the problems are prepared in the same way as ARC contests. We try to make the contest interesting even for reds (by the way, you can estimate the difficulty from point values). I think it's rather a div 1.5 contest rather than a div 2 contest (In this particular contest, since there are no divisions, the contest is like div 1.5 + div2 + div3 contest). We always have English editorials for ARCs these days.

Yahoo Programming Contest 2019 will be held on Saturday (time). The writer is DEGwer.

Contest Link

Contest Announcement

Contest duration: 120 minutes

The point values will be 100 — 200 — 400 — 600 — 800 — 900.

Let's discuss problems after the contest.

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By rng_58, history, 6 years ago, In English

UPD: The contest is tomorrow, from 11:00 JST (4 hours). You can watch the standings from here. The problems will be published later (not during the contest, because finalists have the internet access).

Congratulations to finalists! The date of the event is February 21st.

Full table of GP30 scores

AtCoder Profile CF Handle Country
touristtouristBelarus
cospleermusoraV--o_o--VRussia
PetrPetrRussia
LHiCLHiCRussia
Um_nikUm_nikRussia
yutaka1999yutaka1999Japan
apiadjqdai0815China
ksun48ksun48Canada

By the way, now you can set your picture and CF/TC handles in your AtCoder profile page from https://atcoder.jp/settings.

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By rng_58, history, 6 years ago, In English

AtCoder Grand Contest 030 will be held on Saturday (time). The writers are semiexp, sugim48, and DEGwer.

Contest Link

Contest Announcement

Contest duration: 110 minutes

The point values will be 200 — 800 (300) — 1000 — 1000 — 1400 — 1600.

Let's discuss problems after the contest.

By the way, this is the last contest of the year, and after this match, top 8 people by GP30 scores will qualify for tour finals. Four people (tourist, V--o_o--V, Petr, LHiC) have already qualified, but there are four more slots. Good luck!

Current Standings

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By rng_58, history, 6 years ago, In English

AtCoder Grand Contest 029 will be held on Saturday (time). The writer is yutaka1999. This contest counts for GP30 scores.

Contest Link

Contest Announcement

Contest duration: TBD (around 2 hours)

The point values will be announced later.

Let's discuss problems after the contest.

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By rng_58, history, 6 years ago, In English

We will not hold AtCoder Regular Contests for a while. Probably the next ARC will be in March. Instead, there will be several sponsored tournaments.

The onsite rounds of these tournaments are only for Japanese (we are sorry for that), but we will try to translate majority of qualification rounds into English. In case the problems are translated, usually the contest is rated for <2800 (there can be exceptions, so please check individual announcements). The difficulty/quality of those rounds are at the same level as usual ARCs — so please participate in those contests! There will be one such contest this Saturday (20:00 JST, an hour earlier than usual), and I think it will be announced soon.

There will be two more AGCs this year. date/time of AGC029 date/time of AGC030

After these AGCs, we will announce the top 8 people (by GP30 scores), and they will be invited to World Tour Finals in February 21st!

UPD: We decided to move one AGC to the end of year because it overlapped with NEERC. In next two weeks there will be ABCs, an AGC on 15th, a contest rated for <2800 on 22nd, and an AGC again on 29th.

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By rng_58, history, 6 years ago, In English

AtCoder Grand Contest 028 will be held on Saturday (time). The writer is maroonrk. This contest counts for GP30 scores.

Contest Link

Contest Announcement

Contest duration: 150 minutes

The point values will be announced later.

Let's discuss problems after the contest.

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By rng_58, history, 6 years ago, In English

Sorry for the long blank of AGC. Meanwhile there were lots of big tournaments like GCJ, TCO, FHC. Some of our writers were also busy with helping IOI in Japan. I hope we will be able to hold AGCs more frequently from now.

AtCoder Grand Contest 027 will be held on Saturday (time). The writers are camypaper and sugim48. This contest counts for GP30 scores.

Contest Link

Contest Announcement

Contest duration: 140 minutes

The point values will be 200 — 700 (400) — 900 — 1100 — 1300 — 1900.

Let's discuss problems after the contest.

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By rng_58, history, 6 years ago, In English

Please write a comment if you have more information.

CF Handle Country
1. matthew99China
2. Um_nikRussia
3. ecnerwalaUnited States
4. dotoryaSouth Korea
5. s-quarkChina
6. majkCzech Republic
7. PetrRussia
8. ksun48Canada
9. touristBelarus
10. LHiCRussia
11. aintaSouth Korea
12. qwerty787788Ukraine
13. rng_58Japan
14. KostromaRussia
15. ErrichtoPoland
16. scott_wuUnited States
17. molamola.South Korea
18. RomaWhiteUkraine
19. RadewooshPoland
20. ilyakorSwitzerland
21. vepifanovRussia
22. ikatanicCroatia
23. mareksomPoland
24. dreamoon_love_AATaiwan
25. natsugiriJapan

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By rng_58, history, 6 years ago, In English

I'm preparing for upcoming GCJ Finals. This year GCJ supports only Linux, and I want to learn how to compile solutions on Linux (I think I used it 9 years ago in IOI but completely forgot how to do that...).

Suppose that A.cpp, Main.java, A.py are source codes, A.in is the input, and you want to output to A.out.

On Windows+Cygwin, I usually do the following:

  • g++ -Wl,--stack,268435456 A.cpp -O2
  • ./a < A.in | tee A.out
  • javac Main.java
  • java Main < A.in | tee A.out
  • python A.py

What commands do the same things on Linux?

The following things are installed on the machine:

  • Debian Linux 9.4
  • C++ 6.3.0
  • Java 7 2.2.5
  • Python 2 2.7.13

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By rng_58, history, 6 years ago, In English

AtCoder Grand Contest 026 will be held on Saturday (time). The writer is sugim48 and yosupo. This contest counts for GP30 scores.

Contest Link

Contest Announcement

Contest duration: TBD (about 2 hours)

The point values will be announced later.

Let's discuss problems after the contest.

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By rng_58, history, 6 years ago, In English

In this post I introduce the existence of https://beta.atcoder.jp/. It's a bit more advanced than atcoder.jp, and usually it's also faster to load.

This is an example of beta version of contest page (tomorrow's ARC). For example you can filter your friends in the standings. Please use it!

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By rng_58, history, 6 years ago, In English

I do this, as usual.

GCJ Top 25:

CF Handle AtCoder Handle Country
1. ErrichtoErrichtoPoland
2. ifsmirnovifsmirnovRussia
3. Golovanov399Golovanov399Russia
4. eatmoreeatmoreRussia
5. pashkapashkaRussia
6. RadewooshStonefeangPoland
7. ahyangyiChina
8. semiexpsemiexpJapan
9. zemenzemenRussia
10. jcvbjcvbChina
11. rng_58rng_58Japan
12. JacobJacobRussia
13. dario2994dario2994Italy
14. wingerwingerUnited States
15. akovski (or jqdai0815? I'm not sure)apiad?China
16. kcm1700kcm1700South Korea
17. msg555United States
18. touristtouristBelarus
19. dacin21dacin21Switzerland
20. vepifanovvepifanovRussia
21. SnapDragonCanada
22. SyloviaelyKujouKaren?China
23. LHiCLHiCRussia
24. PavelKunyavskiykunyavskiyRussia
25. V--o_o--VcospleermusoraRussia

DCJ Top 20:

CF Handle AtCoder Handle Country
1. ErrichtoErrichtoPoland
2. mareksommareksomPoland
3. jqdai0815apiadChina
4. qwerty787788qwerty787788Ukraine
5. TejsDenmark
6. sevenkplussevenkplusChina
7. rng_58rng_58Japan
8. tomekPoland
9. kevinsogokevinsogoPhilippines
10. pparysPoland
11. ecnerwalaecnerwalUnited States
12. EgorEgorGermany
13. eddy1021eddy1021Taiwan
14. faguGermany
15. krismazkrismazPoland
16. darnleydarnleyRussia
17. snukesnukeJapan
18. SyloviaelyKujouKaren?China
19. RadewooshStonefeangPoland
20. pashkapashkaRussia

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