Hello!

I would like to invite you to participate in Japan National Coding Contest. The contest will start on August, 05 15:30 IST (check your timezone). Contest will run for 2 hours. For more details, please visit the contest page.

The problemset consists of 2 algorithmic tasks. You will receive points for every test case your solution passes — so you can get some points with partial solutions as well. Problem statements will be in Japanese.

The total prize money is 100,000 yen!.

NOTE: Anyone can participate but the prizes will be given only to Japanese users.

Hello Codeforces!

As mentioned in the previous post regarding the HackerEarth's Annual Programming Contest (IndiaHacks 2017), I would like to invite you to participate in IndiaHacks Qualifier Round. It's a 48 hours contest that will start on June 17, 21:00 IST.

The problem set consists of 3 traditional algorithmic tasks. You will receive points for every test case your solution passes — so you can get some points with partial solutions as well. All the contestants who will score 100 points or more will qualify to the next round. Check contest page for more details about in-contest schedule and rules.

I'm the admin of the contest. Thanks to niyaznigmatul for testing the problem set you'll have to work on. Thanks to prat33k for preparing these tasks.

Happy Coding :)

Hi Everyone,

I would like to invite you all to participate in the HackerEarth's Annual Programming Contest (IndiaHacks 2017). It is an individual contest.

The contest will have 4 rounds:

A. Qualifier: It will be an online contest. The contest will be a 24 hours contest which will have 3 problems. You need to score 100 points to qualify for the next round.

B. Wave 1.0 (First Elimination): It will be an online contest of 5 hours having 5 problems.

C. Wave 2.0 (Second Elimination): It will be an online contest of 3 hours having 6 problems. 50 contestants (top 25 Global + top 25 Indian) will move to the Finals.

D. Finals: It will be an online contest of 3 hours having 6 problems.

Schedule:

• Qualifier: 17th June, 2017

• Wave 1.0: 9th July, 2017

• Wave 2.0: 6th August, 2017

• Finals: 3rd September, 2017

Prizes:

Registration Link: https://www.hackerearth.com/challenge/competitive/programming-indiahacks-2017/

Last year contest link for practice:

• Qualifier 1
• Qualifier 2
• Qualifier 3
• Elimination
• Finals

UPD: Wave 2.0 (Second Elimination):** It will be an online contest of 3 hours having 6 problems. 60 contestants (top 30 Global + top 30 Indian) will move to the Finals.

Congratulations to the winners of IndiaHacks Finals.

Top 5 Global:

1. tourist
2. Shik
3. jqdai0815
4. LHiC
5. uwi

Top 5 Indian:

1. akashdeep
2. TooDumbToWin
3. gvaibhav21
4. naveen_iitr
5. Chenghiz

Full leaderboard

Hello everyone!

I would like to invite you to participate in an upcoming HackerEarth contest — HackerEarth May Easy '17. The contest will start on May, 1 22:00 IST (check your timezone).

The problemset consists of 6 traditional algorithmic tasks. You will receive points for every test case your solution passes — so you can get some points with partial solutions as well. Please check contest page for more details about in-contest schedule and rules.

You'll have 3 hours to solve problems prepared by me (r3gz3n) and xennygrimmato. Thanks to usaxena95 for helping me with the preparation of the problems and testing them. Thanks to MikeMirzayanov for creating Polygon.

The contest is RATED.

Happy Coding!

UPD: The contest is ended. I hope you have enjoyed the problems. Editorials will be published soon.

Congratulations to winners:

1. HellKitsune

2. biginnnner

3. chemthan

4. Fcdkbear

5. rubabredwan

Hello!

I would like to invite you to participate in Japan National Coding Contest. The contest will start on April, 29 20:30 IST (check your timezone). Contest will run for 2 hours. For more details, please visit the contest page.

The problemset consists of 2 algorithmic tasks. You will receive points for every test case your solution passes — so you can get some points with partial solutions as well. Problem statements will be in Japanese.

The total prize money is 100,000 yen!.

NOTE: Anyone can participate but the prizes will be given only to Japanese users.

All you need is love. But some algorithmic problems now and then doesn't hurt.

Hello everyone!

I would like to invite you to participate in HackerEarth February Circuits '17. It's a long contest that will start on February, 17, 21:00 IST (check your timezone). Contest will run for 9 days.

The participants will be challenged with 7 traditional algorithmic tasks and 1 approximate problem of varying difficulty levels in a duration of 9 days. For traditional algorithmic tasks, you will receive points for every test case your solution passes — so you can get some points with partial solutions as well. For the approximation task, your score depends on the best solution in the contest so far. Here is the detailed time line of the challenge,

• Day-0 : Problem-1 (Easy) , Problem-2 (Easy-Medium), Approximate
• Day-2 : Problem-3 (Easy-Medium) , Problem-4 (Medium)
• Day-4 : Problem-5 (Medium-Hard) , Problem-6 (Hard)
• Day-6 : Problem-7 (Hard)
• Day-7 : Challenge Ends

I am the admin of the contest. I'd like to thanks KuchumovIlya for preparing the tasks and niyaznigmatul for testing them and MikeMirzayanov for creating Polygon.

The contest will be RATED.

Happy Coding :)

UPD1: First Set is live.
UPD2: Second Set is live.
UPD3: Third Set is live.
UPD4: Final Set is live.

Hello everyone!

I would like to invite you to participate in HackerEarth January Circuits. It's a long contest that will start on January, 20, 21:00 IST (check your timezone). Contest will run for 8 days.

The participants will be challenged by multiple Problem Setters with 7 traditional algorithmic tasks and 1 approximate problem of varying difficulty levels in a duration of 8 days. For traditional algorithmic tasks, you will receive points for every test case your solution passes — so you can get some points with partial solutions as well. For the approximation task, your score depends on the best solution in the contest so far. Here is the detailed time line of the challenge,

• Day-0 : Problem-1 (Easy) , Problem-2 (Medium), Approximate
• Day-2 : Problem-3 (Easy-Medium) , Problem-4 (Medium-Hard)
• Day-4 : Problem-5 (Easy-Medium) , Problem-6 (Medium-Hard)
• Day-6 : Problem-7 (Hard)
• Day-7 : Challenge Ends

I am one of the Problem Setters. I'd like to thanks prat33k, vaibhavjaimini, gamer12 and Lewin for preparing the tasks, FatalEagle for testing them and MikeMirzayanov for creating Polygon.

The contest will be RATED.

Happy Coding :)

UPD: Problem-3 and Problem-7 will not have partial scoring.

UPD1: Solutions of the Setter and Tester was wrong for Problem 7. This is a big mistake from our side. We are sorry for the inconvenience. Due to this, the January Circuits will be UNRATED. Regarding the prizes, we will distribute the prizes on the basis of score of the other 7 problems.

Christmas isn't a season. It's a feeling. — Edna Ferber

Hello everyone!

I would like to invite you to participate in another HackerEarth contest. This time it is Christmas Circuits. It's a long contest that will start on December, 16, 21:00 IST (check your timezone). Contest will run for 8 days.

The problemset consists of 7 traditional algorithmic tasks and 1 approximate problem. For traditional algorithmic tasks, you will receive points for every test case your solution passes — so you can get some points with partial solutions as well. For the approximation task, your score depends on the best solution in the contest so far. Check contest page for more details about in-contest schedule and rules.

The contest stories will be about Christmas and the main character will be Little Santa. I'd like to thanks KuchumovIlya for preparing these tasks, I_love_Tanya_Romanova for testing them and MikeMirzayanov for creating Polygon.

The contest will be RATED.

Happy Coding and Merry Christmas :)

Hello everyone!

I would like to invite you to participate in HackerEarth Codemonk (Checkpoint — 1). The contest will start on December, 12 21:00 IST (check your timezone). Contest will run for 3 hours.

The problemset consists of 6 algorithmic tasks. You will receive points for every test case your solution passes — so you can get some points with partial solutions as well.

The contest is RATED.

Happy Coding.

Hello Codeforces,

After a long gap of 3 weeks, Monk is back with CodeMonk (Number Theory Part 1). The contest will start on December, 5 21:00 IST (check your timezone). Contest will run for 3 hours. The topic we will be focusing on in this contest are:

1. Modular Arithmetic
2. Modular Exponentiation
3. GCD / LCM
4. Extended Euclidean Algorithm
5. Modular Multiplicative Inverse
6. Prime Numbers
7. Prime Factors

I would like to invite you to participate in the contest. The problemset consists of 5 traditional algorithmic tasks. You will receive points for every test case your solution passes — so you can get some points with partial solutions as well.

I am one of the tester of the problemset you will be working on: thanks to prat33k, MazzForces, vaibhavjaimini and trytolearn.

Tasks should not be very hard for top-level contestants, and I expect them to get full score. Codemonk focuses on aspiring programmers who aim to be better at coding. However, expert programmers can also use it as a means to revise concepts and improve their programming karma.

Hi Everyone,

We conducted the final round of the HackerEarth Collegiate Cup on 5th November, 2016. There were 2 contests. One was the Onsite Round and other was the Mirror Round. There were 12 problems to be solved in 5 hours (ACM ICPC style) in both the rounds.

Onsite Round:

4 problems remained unsolved. Top 3 teams in the Onsite Round are:

1. FacelessMen (alecsyde, TerryMcGinnis, sahilgrover) : Indian Institute of Technology, Kanpur

2. FruitSalad (yashkumar18, kuldeeppatel, Sumeet.Varma) : Dhirubai Ambani Institute for Information and Communication Technology

3. mobius_treap (vmrajas, Baba, itisalways42) : International Institute of Information Technology, Hyderabad

Mirror Round:

1 problem remained unsolved. Top 3 teams in the Mirror Round are:

1. Jinotega (Arterm, zemen, ifsmirnov) : Moscow Institute of Physics and Technology

2. VietAnplusplus (tanphatls987, phvietan, TGod2401) : Ho Chi Minh City University of Science

3. Frogless (mgch, ballon, Fdg) : Kiev National Taras Shevchenko University

Congrats to the winners.

The problems for this round were written by me (r3gz3n), magieNoire, trytolearn, ashish1610, KuchumovIlya and PrinceOfPersia. I'd like to thank:

• My coauthors for contributing great problems to these round.
• vaibhavjaimini, MazzForces for helping me with the preparation of these rounds.
• I_love_Tanya_Romanova for helping me with the preparation of these rounds and testing the problems.
• pkacprzak for writing the editorials of some of the problems.
• MikeMirzayanov for creating Polygon.

Remaining editorials will be uploaded soon.

Here are the full leaderboards of both the contests.

Onsite Round: LeaderBoard

Mirror Round: LeaderBoard

Hello Everyone,

Last week we conducted HackerEarth Collegiate Cup Second Elimination Round. Here is the screenshot of the LeaderBoard.

There were 10 problems to be solved in 5 hours. Jinotega managed to solve 9 out of 10 problems and secured the first position. One problem remained unsolved. 15 teams got selected from India and 5 teams got selected globally. Just for fun, the last team that got selected from India for the Final Round is named alwayslast. :)

Top 5 Global teams who got qualified for the Final Round are:

1. Jinotega: Moscow Institute of Physics and Technology

2. demonteam: Moscow State University

3. VietAnplusplus: Ho Chi Minh City University of Science

4. Frogless: Kiev National Taras Shevchenko University

5. lovesubcul-Team: University of Tsukuba

Top 5 Indian teams who got qualified for the Final Round are:

1. FacelessMen: Indian Institute of Technology, Kanpur

2. FruitSalad: Dhirubai Ambani Institute for Information and Communication Technology

3. Survivor: Indian Institute of Technology, Indore

4. HoldTheDoor: Jaypee Institute of Information Technology

5. mobius_treap: International Institute of Information Technology, Hyderabad

Here is the full list of all the teams who are qualified for the Final round:

https://docs.google.com/spreadsheets/d/1s7D_rlUAnxwbF5vB13KprWU3hJzpTqj9OhiNekYyidI/edit?usp=sharing

Congratulations to all the teams who got qualified for the Final Round.

EDIT: Here is the link of the full LeaderBoard of Second Elimination: https://www.hackerearth.com/hackerearth-collegiate-cup-second-elimination/leaderboard/

Hi Everyone,

Here is the result of the HackerEarth Collegiate Cup WildCard Round.

Congratulations to all the teams who qualified for the Second Elimination Round.

Top 5 teams in the WildCard Round are:

1. Frogless: Taras Schevchenko National University

2. DividenConquer: Indian Institute of Technology — Delhi

3. bitbeasts: International Institute of Information Technology, Hyderabad

4. Survivor: Indian Institute of Technology — Indore

5. Invictus: Indian Institute of Technology — Bombay

Hi Everyone,

Congratulations to all the teams who qualified for the Second Elimination Round.

For those who didn't qualify or missed the previous rounds, there is another chance (Wild Card Round) to directly get into the Second Elimination.

Top 5 teams in the First Elimination Round are:

1. Jinotega: Moscow Institute of Physics and Technology

2. Many-Named-Team: Indian Institute of Technology, Roorkee

3. Tachyon: National University of Cajamarca

4. Crypt0z00l0gy: Moscow Institute of Physics and Technology

5. Trie_Hard: Netaji Subhas Institute of Technology Delhi

Here is the full result: Result

Hi everyone,

Are you preparing for ACM International Collegiate Programming Contest (ICPC) ?

As we all know that ICPC is about to start. I am glad to invite all the college students to take part in HackerEarth Collegiate Cup on Sep 03, 10:00 AM IST. It will add up in the practice for ACM-ICPC. This is a team contest where teams must consist of exactly 3 members and all members must be enrolled in a degree program at the same institution.

The contest will have 4 rounds:

A. Qualifier Round: It will be an online contest. All the teams who solve at least one problem will qualify to the next round. It will be a 24 hours contest which will have 3 problems.

B. First Elimination: It will be an online contest of 3 hours having 5 problems. Top 3 teams from each institution who have solved at least one problem will move to the next round.

C. Second Elimination: It will be an online contest of 5 hours having 10 problems. Top 15 Indian teams each from different college will qualify for the final onsite round and top 15 Global teams each from different college will be eligible for prizes in the online Mirror round.

D1. Final Round (Onsite): This will be an onsite round in which the 15 Indian teams selected from second elimination will participate. It will be a 5 hours contest having 12 problems.

D2. Mirror Final Round (Online): This will be an online round of 5 hours, and having the same 12 problems as of the Final Onsite round. Anyone can participate in this but only the top 15 Global teams who qualified the second elimination will be eligible for prizes.

Schedule:

• Qualifier Round: 3rd September, 2016 10am IST

• First Elimination: 17th September, 2016 10am IST

• Second Elimination: 8th October, 2016 10am IST

• Final Onsite Round / Final Mirror Round: To be announced

Prizes:

• First Prize: i Pad Mini 2 (per member)
  Second Prize: Das Keyboard (per member)
  Third Prizes: Asus Zenwatch 2 (per member)

• Winning Team of the onsite round shall be reimbursed an amount not greater than INR 45K per member against the total travel expenses, if they will get selected for the ICPC World Finals.

• Winning team of the top 15 Global teams in the Mirror Round will get $250 Amazon Gift Voucher per team member.

Reimbursement:

• Top Indian 15 teams selected for the onsite round will be reimbursed an amount not greater than INR 10K per member against the total travel expenses.

• The said amount shall be reimbursed against submission of valid proof (in original) E.g. Train & Bus Tickets.

Happy Coding :)

EDIT: The First Elimination Round has been postponed to September 18, 2016, 5:00 PM IST. All qualified teams have been informed through mails.

I tried to run this code on my machine and is giving correct answer for the 21st test case. Please check why its giving wrong answer on codeforces compiler.