Top Recent Blog Posts
By Ari, history, 5 days ago, In English

Note: I can't figure out how to place the tutorials inside spoilers. If someone is familiar with how CF spoilers work and can help I would really appreciate it. For now, be warned that the tutorials are visible by default (but everything else isn't)

UPD: I figured out how to use spoilers! Also added implementations for all problems.

Thanks for participating in our contest!

1509A - Average Height

Author: Kuroni
First solve: cfg0d at 00:01:02

Hint
Tutorial
Comments from the authors

Implementation

1509B - TMT Document

Author: Ari
First solve: blue5002 at 00:04:51

Hint
Tutorial
Comments from the authors

Implementation

1509C - The Sports Festival

Author: Ari
First solve: Dukkha at 00:05:32

Hint 1
Hint 2
Tutorial
Comments from the authors

Implementation

1508A - Binary Literature

Author: Ari
First solve (Div. 2): traxex2 at 00:22:48
First solve (Div. 1): tourist at 00:05:04

Hint 1
Hint 2
Hint 3
Tutorial
Comments from the authors

Implementation

1508B - Almost Sorted

Author: Both of us!
First solve (Div. 2): shenmadongdong.qaq at 00:29:52
First solve (Div. 1): tourist at 00:08:19

Hint 1
Hint 2
Hint 3
Tutorial
Comments from the authors

Implementation

1508C - Complete the MST

Author: Kuroni
First solve (Div. 2): deepspacewaifu at 01:42:36
First solve (Div. 1): maroonrk at 00:33:17

Hint 1
Hint 2
Hint 3
Hint 4
Tutorial
Comments from the authors

Implementation

1508D - Swap Pass

Author: Ari
First solve: ksun48 at 00:57:13

Hint 1
Hint 2
Hint 3
Hint 4
Tutorial
Comments from the authors

Implementation

1508E - Tree Calendar

Author: Kuroni
First solve: ecnerwala at 01:02:26

Hint 1
Hint 2
Hint 3
Hint 4
Tutorial
Comments from the authors

Implementation

1508F - Optimal Encoding

Author: Kuroni
First solve: ecnerwala at 01:52:02 (The only contestant who solved this problem!)

Hint 1
Hint 2
Hint 3
Hint 4
Hint 5
Hint 6
Tutorial
Comments from the authors

Implementation

Finally, here's some funny moments that happened while we were working on the round :)

Memes

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By maroonrk, history, 28 hours ago, In English

We will hold AtCoder Regular Contest 117.

The point values will be 200-400-600-600-900-900.

We are looking forward to your participation!

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By hmehta, history, 32 hours ago, In English

The first Online Round of the 2021 Topcoder Open Algorithm Competition has arrived! Round 1A will be held on Saturday April 17, 2021 at 12:00 UTC -4 and you are invited to compete.

How many will qualify?
The 750 highest scorers from each Round 1 will win a spot in Round 2 of the Algorithm Competition.

How to Compete?
Please note that you must register for this round in the Arena or Applet

Registration is open for the round and closes at 11:55 UTC -4. Be sure you register early to guarantee your spot in the round as registration is limited to the first 2,500 competitors. Please take a look at our How to Compete guide to understand Topcoder Algorithm rounds better.

Don't forget! There will be one more Round 1 — Round 1B on Wednesday, April 28, 2021 at 07:00 UTC -4.

New to Topcoder and the TCO21? The Algorithm Competition is one of the most fierce and popular tournaments. Battle up against some of the biggest names in coding. Learn more.

The Topcoder Open Algorithm Competition consists of an Onsite Finals and there are three ways to advance to the Onsite Finals:

  • Four online stages,
  • Four online rounds,
  • Up to five onsite regional rounds followed by one online wild card round.

TCO21 Algorithm Competition Schedule:
Round 1A: April 17 at 12:00
Round 1B: April 28 at 07:00
Round 2A: May 22 at 12:00
Round 2B: June 2 at 07:00 
Round 3: July 8 at 07:00
Round 4: July 31 at 12:00

All times are in UTC -4.

Some Important Links:: Match Results (match results, rating changes, challenges, individual test case results), Problem Archive, Problem Writing, Algorithm Rankings, Editorials and Older Editorials(SRM 710 and before),

Best of luck to you in the Arena!
- The Topcoder Community Team

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By radoslav11, history, 7 hours ago, In English

We invite you to participate in CodeChef’s April Cook-Off, this Sunday, 18th April.

Time: 9:30 PM — 12:30 AM IST. Please note the change in contest duration.

The April Cook-Off is going to have Amazon as the official contest recruiter! Amazon is hiring for Software Development Engineer 1, Software Development Engineer 2, and Support Engineer roles for its fast-paced environment.

Also, if you have some original and engaging problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Joining us on the problem setting panel are:

Prizes:

The winners will receive CodeChef laddus with which they can claim cool CodeChef goodies. Know more here.

The video editorials of the problems will be available on our YouTube channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Good Luck! Hope to see you participating!! Happy Programming!!

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By smit_123, 6 hours ago, In English
  • Everyone knows about the level of cheating occurring in the CodeChef Long Challenge due to which genuine programmers are losing interest in the Long challenge.:(

  • Since the margin of cheating is very little in short challenges we can see that the no of participants falls down to 8k(March Cookoff) from 30k (March Long challenge), I just have a random suggestion I don't know if it's possible or not that It should be made a rule that one will get the ratings of the long challenge of the month if and only if he will participate in any one of the short contests in that month. ;)

  • Many people won't like this blog, not because of bad opinion but either it's to their disadvantage or might be because I am a pupil xD. Anyways Thanks For Reading

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By Petr, history, 7 hours ago, In English
 
 
 
 
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By chokudai, history, 36 hours ago, In English

We will hold Japanese Student Championship 2021.

Everyone is welcome to participate. Please note that this contest will be held at a different time than usual.

The point values will be 100-200-300-400-500-600-600-600.

We are looking forward to your participation!

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By sharabhagrawal25, history, 3 days ago, In English

Hello, Codeforces community

The Club of Programmers, IIT BHU is excited to announce the launch of Graph Theory playlist of COPS YouTube channel.

The playlist contains some basic and intermediate concepts of graph theory. The videos and the corresponding document not only provide explanation to the concept but also provide a proper roadmap on how to study these concepts along with the practice problems.

The videos are in a mix of Hindi and English.

Graph Theory Playlist link : https://www.youtube.com/playlist?list=PLLt4yMoVgczV8N1LTzA6eXoWlXU9MTQv7

Following topics are covered in the playlist:

.. and we will also be covering some advanced concepts of graph theory soon. Before that, stay updated for upcoming dynamic programming playlist and do subscribe to our channel.

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By _Ape_, history, 8 days ago, In English

Hello Codeforces!!!

We are excited to invite you to IIIT Lucknow’s annual team coding event CODUO, which will be organised in two ladders, one is prelims to be held on Codechef 14th April from 8:30 pm IST and the qualified teams will be invited to participate in the finals that will take place during the period of our annual techfest Equinox. Coduo will be a 3-hour contest ( individual participation or Team of 2 members).

Problem set has 8-9 problems of varying difficulty.

Contest link- https://www.codechef.com/CDUO2021

This contest is a part of our annual technical fest — Equinox`21, IIIT Lucknow.

-And, Thanks to the Codechef team for providing their valuable platform.

PRIZES:

The total prize money (for Winners of Finals) is worth INR 20,000.

Also, the top 3 teams in the Prelims will get 250 Codechef laddus each. We hope that you'll enjoy the contest just as much as we did preparing it!

Good luck!!

Update:Test case was later update for the question Time Table. We will decide the winners considering this factor. We will manually check all the submission for that problem and run it locally to check for their 1st correct submission and for every team the time will be their first correct submission and penalties for the submissions prior to it. Again I am really sorry for this issue :/

We will finalize the winners after considering submissions for "Time Table" as mentioned and then we will update the blogs on both Codeforces and Codechef and the winners will be mailed as well by 5:00 pm IST tomorrow.

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By Rockstar31, 4 days ago, In English

Screenshot-from-2021-04-14-11-29-20

Hey CodeChef_admin this is fu*kin annoying, please don't ask every minute to subscribe to your notifications. Don't force, if someone doesn't want to then let them live peacefully.

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