I do this as usual.

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.

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

• Contest URL: https://atcoder.jp/contests/agc034
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20190602T2100&p1=248
• Duration: TBD (around 2 hours)
• Number of Tasks: 6
• Writer: yosupo, maroonrk, sigma425
• Rated range: All

The point values will be announced later.

We are looking forward to your participation!

We will hold M-SOLUTIONS Programming Contest.

• Contest URL: https://atcoder.jp/contests/m-solutions2019
• Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20190601T2100&p1=248
• Duration: 120 minutes
• Number of Tasks: 6
• writer: yokozuna57
• Rated range: ~ 2799

The point values will be announced later.

We are looking forward to your participation!

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

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.

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.

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.

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.)

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.

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.

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

The next two contests will be:

• AGC031 March 10th (Sun) 23:00 JST March 23rd (Sat) 22:00 JST

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.

• AGC032 March 16th (Sat) 21:00 JST

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).

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

• Contest Link: https://atcoder.jp/contests/wtf19-open
• Start time: February 23rd (Sat), 23:00 JST
• Duration: 4 hours

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.

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.

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
tourist	tourist	Belarus
cospleermusora	V--o_o--V	Russia
Petr	Petr	Russia
LHiC	LHiC	Russia
Um_nik	Um_nik	Russia
yutaka1999	yutaka1999	Japan
apiad	jqdai0815	China
ksun48	ksun48	Canada

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

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

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.

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.

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.

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.

Please write a comment if you have more information.

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

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.

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!

I do this, as usual.

GCJ Top 25:

DCJ Top 20: