Hi Codeforces community,

Computer Science Association & Association of Computing Machinery, BITS PILANI, Pilani Campus presents you their flagship contest, "International Coding League 2018". It is being organised as a part of our annual technical fest, Apogee.

The contest will be External rated contest and will be of 2.5 hours.

Contest Link : https://www.codechef.com/ICL2018

Start Time : 20:00 IST, 27th February' 2017

Prizes: Worth Rs 20000 (10k + 6k + 4k) for top 3 Indian winners.

Also top 2 Global winners and top 2 Indian winners will get 250 laddus each.

The contest consists of 5 algorithmic problems of varying difficulty. The problems have been set such that even beginners can attempt a few problems and even the best coders find tough job ahead at the hard ones. It is advised to read every problem in the contest. The detailed editorials of all the problems with the Setter's & Tester's code will be uploaded immediately after the contest so that you may benefit from it.

The setting and testing panel includes flatline, likecs, diveshuttam, RoronoaXoro and vibhavoswal. I would also like to thank arjunarul from Codechef team for going through the problems and improving the statements as well.

To participate in the contest, you just need a Codechef handle and then just click on the link mentioned above for participating for the contest.

I hope you enjoy the contest and Happy Coding :)

You can find the link of last year contest here

Hello Codeforces,

I invite you all to participate in HackerEarth's June Easy on the 2nd of June at 10:00 PM IST.

You will be given 6 problems to solve in 3 hours. The problem difficulty will be similar to that of a Div. 2 round on Codeforces. Each problem will be worth 100 points, but partial scoring is allowed so you can try to pass as many tests as you can.

The contest will be rated and will have prizes for the top 5 beginners.

The problems have been set by Anand Jaisingh (MazzForces) and tested by me (akulsareen). I would also like to thank HackerEarth admin, Arjit Srivastava (belowthebelt) for all his help.

Good Luck and Have Fun.

UPD: Contest has been extended by 1.5 hours

Could anyone please share their ideas for solving problem I: Interesting Interactive Idea from the 2016-2017 NEERC Moscow Subregionals.

I have not been able to make any progress for quite some time and would appreciate any help.

Hello Coders!

The 46th edition of 101 Hack is here. There will be 5 very interesting challenges in 2 hours. The contest commences on on 14th February 2017 at 16:00 UTC, You can sign up for the contest here.

Top 10 on leaderboard get cool HackerRank T Shirts

Problem Setters
satyaki3794, akulsareen, pranet

Problem Testers
niyaznigmatul, mfv

I would also like to thank shashank21j for all his help during the preparation of the contest and making sure that we actually make the problems instead of just talking about making them.

A lot of effort has gone into making sure the contest has something for everyone so I strongly recommend you to participate and to read all problems. I hope you will enjoy solving the problems as much as we did making them.

Editorials will be available at the end of contest.

GL&HF

UPD: Contest has finished. Top 10 are as follows:

1. anta

2. uwi

3. Kaban-5

4. I_love_Tanya_Romanova

5. Deemo

6. Sarkin

7. kuzmichev_dima

8. yenthanh.t7

9. Tima

10. WHITE2302

Editorials should be up shortly. Feel free to discuss the problems and give your feedback in the comments. Hope you had fun.

Hi everyone!

I would like to invite you to participate in February Clash at HackerEarth. The contest is scheduled to start at February 11, 1200 hrs IST. The contest will last for 24 hours so everyone should be able to find some time to comfortably participate.

There will be six tasks in the problemset. Five of them are standard algorithmic problems with partial solutions allowed — you get points for every test that your solution passed. And the last task is an approximate problem — your score for this task depends on how good your solution is compared to the current best solution.

flatline, pkacprzak, Sokolov, r3gz3n and Abhinav Gupta are the authors of this problemset. All the testing was done by me, akulsareen

I hope that everyone from beginners to experienced contestants will be able to find some problem that challenges and interests them. In case you find all problems too easy there is always the approximate challenge to tackle.

As always, belowthebelt was a great help, and I would like to thank him for taking care of all the technical aspects of contest preparation.

While problem solving is rewarding enough on its own, there will be some added incentive for you to do well.

Top5 of leaderboard will receive some nice prizes:

1. $100 Amazon gift card + HackerEarth T-shirt

2. $75 Amazon gift card + HackerEarth T-shirt

3. $50 Amazon gift card + HackerEarth T-shirt

4. HackerEarth T-shirt

5. HackerEarth T-shirt

Good luck to everyone — hope to see you at the top of the leaderboard.

UPD: Contest is now over.

Hi everyone!

I would like to invite you to participate in September Clash at HackerEarth. The contest is scheduled to start at September 10. The contest will last for 24 hours so everyone should be able to find some time to comfortably participate.

There will be six tasks in the problemset. Five of them are standard algorithmic problems with partial solutions allowed — you get points for every test that your solution passed. And the last task is an approximate problem — your score for this task depends on how good your solution is compared to the current best solution.

RomaWhite is the author of this problemset. He is an experienced contestant and problem setter so you can be assured of a high quality problemset.

I was working on the contest as a tester and editorialist, and I personally found the set very interesting. I hope that everyone from beginners to experienced contestants will be able to find some problem that challenges and interests them.

As always, belowthebelt was a great help, and I would like to thank him for taking care of all the technical aspects of contest preparation.

While problem solving is rewarding enough on its own, there will be some added incentive for you to do well.

Top5 of leaderboard will receive some nice prizes:

1. $100 Amazon gift card + HackerEarth T-shirt

2. $75 Amazon gift card + HackerEarth T-shirt

3. $50 Amazon gift card + HackerEarth T-shirt

4. HackerEarth T-shirt

5. HackerEarth T-shirt

Good luck to everyone — hope to see you at the top of the leaderboard.

UPD1: Contest is now over. Final test case generation for approximate problem is being done and leaderboard will be finalised soon. Editorials have also been released for all problems.

UPD2: Additional cases for approximate problem have been added and problem has been rejudged. Leaderboard is now finalised. Congratulations to the winners and thanks to everyone for participating.

The top 5 are:

1. mugurelionut

2. zeliboba

3. ceilks

4. uwi

5. rantd

Hello Codeforces,

I invite you all to participate in HackerEarth's April Easy on the 2nd of April at 9:30 PM IST.

You will be given 6 problems to solve in 3 hours. The problem difficulty will be similar to that of a Div. 2 round on Codeforces. Each problem will be worth 100 points, but partial scoring is allowed so you can try to pass as many tests as you can.

The contest will be rated and will have prizes for the top 5 beginners.

The problems have been set by Pranet Verma (pranet) and tested by me (akulsareen). I would also like to thank HackerEarth admin, Arjit Srivastava (belowthebelt) for all his help.

Good Luck and Have Fun.

EDIT: Contest has been postponed by 1 day to avoid clashing with the Codeforces round.

UPD: Contest has ended. Congratulations to the top 5:

1. azukun

2. ceilks

3. Kmcode

4. hellman_

5. rantd

I was trying to find out the solution for a couple of problems from the past couple of SRM's but instead discovered that there are no editorials for any SRM/TCO round after TCO round 1C.

Could the people responsible for publishing editorials please release the editorials for recent rounds.

Also, I am curious as to what model Topcoder follows. On Codeforces the author of a particular round also provides an editorial. However, on Topcoder there seems to be a separate set of people who write all the editorials, which can easily cause a backlog. If that is the case may I suggest switching over to the Codeforces model of having a rounds author also write the editorials for that particular round. But all this is just me guessing stuff.

At the end of the day I would really like to see the editorials for the recent rounds.

I usually like to wait for chrome or someone else to remind all you good folk about an upcoming SRM but it seems like they have forgotten. So here goes.

Hi there!

Tomorrow at 6:30 IST will be held Topcoder SRM 661.

Let's discuss problems after contest!

GL && HF.

I had to resubmit an old solution of mine on Codeforces. So I took my old solution, which had a lot of individual #includes in it, replaced them all with one common #include <bits/stdc++.h> and resubmitted.

Surprisingly, my old solution, which gave an AC, gave TLE on case 6 after the change.

Links:

Old solution

New solution

Could someone please point out what happened here?