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By Vladithur, history, 44 hours ago, In English

Thanks for participating in the round, we hope you liked the problems!

Solve count predictions (official div. 2)

1712A - Wonderful Permutation

Hint
Tutorial

Bonus: solve for every $$$k$$$ from $$$1$$$ to $$$n$$$ for $$$n \le 10^5$$$.

1712B - Woeful Permutation

Hints
Tutorial

Bonus: try to prove the solution without the editorial!

1712C - Sort Zero

Hints
Tutorial

Bonus: solve for when $$$a_i$$$ can also be negative.

1712D - Empty Graph

Hints
Tutorial

Bonus: solve for every $$$k$$$ from $$$1$$$ to $$$n$$$.

1712E2 - LCM Sum (hard version)

Hints
Tutorial

Bonus: solve the problem in $$$\mathcal{O}((n + t) \log n)$$$ or better.

1712F - Triameter

Hints
Tutorial

Bonus: solve for $$$n, q \le 10^6$$$.

Don't forget to rate the problems!

Problem Feedback

PS: Solution codes probably will be added later.

UPD: explanations of the references:

Click here

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By maroonrk, history, 36 hours ago, In English

We will hold AtCoder Grand Contest 058. This contest counts for GP30 scores.

The point values will be 400-700-900-1000-1400-2000.

We are looking forward to your participation!

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By CheaterExposer69, history, 24 hours ago, In English

The contest is not even over yet! And the cheaters are spoiling this place every day. They completely spoiled CodeChef. I stopped doing CodeChef for these people. Now they are killing Codeforces too.
These screenshots doesn't help about building any idea about the problem solution. I cropped them as the contest is not over yet.

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By Deaf-Guy-Bad-English, history, 2 days ago, In English

1) When did you start programming?

2) When did you start competitive programming?

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By kylych03, history, 14 hours ago, In English

Hello everyone!

Similar to last year, these are the country standings for IOI 2022 based on the sum of scores of all contestants. Check the spoiler at the bottom for the complete list.

Rank Team Score
1CHN2310
2USA1909
3JPN1871
4IOI_21725
5KOR1624
6CAN1504
7TWN1502
8UKR1500
9IRN1448
10ROU1387

Complete list

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By SurajSP, history, 7 hours ago, In English

Hi Guys. When a Contest Ends I See a Lot of People Asking "How to Solve C Problem" or Any Problem. And Since Comment Section is Huge, Sometimes Its Hard to Find Where it is, Because Sometimes People Ask This Same Question in a Different Way/Sentence. So Searching Through That FIND Option is Harder.

So In a Contest, There is Two Things in Right Corner. They are 1) Announcement 2) Editorial. I Suggest to Add One More Thing Like "Contestant's Editorial" or Call it any Name. So it Would Like This 1) Announcement 2) Official Editorial 3) Contestant's Editorial.

This Contestant's Editorial Section Should Be Opened Immediately, Once The Contest Ends. And in That, Comment Section Opened For Each And Every Problem Asked In That Contest. Like Problem A Should Have Dedicated Comment Section For it, Problem B Should Have Dedicated Comment Section For it and so on ....... For Each and Every Problem. And Also it Should Have Upvotes option.

Making This Would Actually Help A Lot For All People. So I Request MikeMirzayanov To Add This Feature.

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By SAT2020, history, 23 hours ago, In English

Hey everyone,

During today's contest, I realized something weird about the new test case format: when you copy a test case by pressing the "copy" button, there's no newline at the end! This means that your first output will be on the same line as the last input, and you need to hit enter to get the last output to work. While this is obviously not a huge deal, it was a little weird to me and personally, I much preferred the old format.

Am I just a fool? Please tell me if so, I want to go back to the way things were! If this is just a feature of the new format, then please MikeMirzayanov: bring the newline back!

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By kostka, 12 hours ago, In English

As the results of the IOI 2022 are now official, I would like to wholeheartedly congratulate:

  • Benjamin Bajd on the first gold medal for  Slovenia (after 4 tries!)
  • Egor Georgievskii on the first ever medal for  Montenegro (he was the only participant in his country's delegation this year)
  • Nicola Abusaad on the first ever medal for  Palestine
  • Rolly Mamani on the first ever medal for  Peru (this was also the first time when Peru participated in the IOI!)

Congratulations to all! I really hope you all just opened the bag of medals for your countries!

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By 13777Tesla369, 2 days ago, In English

Congratulations, The TOP 4 are all Chinese. Absolutely great achievement(Doremy's IQ can always HANDLE it!) Really, This nation is very talented in CP. But can any one of the Chinese top coders share his experience in competitive programming with me and how to improve overtime and maintain stability over expert? Leaderboards, https://ranking.ioi2022.id/

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By loverBoUy, history, 6 hours ago, In English

Sorry, I don't have any friends (I have a girlfriend but she has no idea about this(:) with whom I can discuss this, so I'm writing this here. I want to announce that I've finally reached pupil after 5 contests.

Thank you

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