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Internet Problem Solving Contest

Welcome to IPSC

The Internet Problem Solving Contest is an online programming competition for teams of up to three people. Each year, hundreds of teams gather to solve challenging problems and test their skills against some of the best programmers in the world.

The problems range from easy to very hard, so everyone is welcome to compete. We also have separate ranklists for individuals and secondary school students. You can use any programming language, or even solve problems by hand. Most of the problems are algorithmic in nature, but IPSC is particularly known for its unusual and fun problems. Here are some of our favorites:

If that sounds interesting, you should compete in IPSC 2015! Until then, you can also try solving the above problems in the Training Area. Or browse through our Archive and see if anything else catches your eye.

How to compete

IPSC 2015 will start on 20 June 2015 at 11:00 UTC, so get ready!

  1. Find a team of up to 3 people, or compete as an individual.
  2. Read the contest rules and register for the contest.
  3. Optionally, take part in the practice session to see how the contest works – especially if you're competing for the first time.
  4. When the contest starts, read the problem statements and begin solving.
  5. Choose a problem, download its input files, and try to write a program that produces the correct output file.
  6. Submit the output file and wait until it's judged "OK" or "Wrong answer".
  7. Repeat that until you have solved everything.

IPSC 2015 is coming

IPSC 2015 will take place from 20 June 2015, 11:00 UTC to 20 June 2015, 16:00 UTC. (Click the links to find out your local time.)
The practice session runs from 19 June 2015, 9:00 UTC to 20 June 2015, 9:00 UTC.

If you want to prepare for the contest, try our new Training Area, where you can practice on all past IPSC contests since it began in 1999.

Good luck and have fun!

Postcard Quest

We still don't have enough postcards from all over the world. Therefore the annual special task remains: You are encouraged to send us a nice postcard. If the postcard arrives before IPSC 2015 begins, your team will be awarded -60 penalty minutes. (Don't forget to write the name of your team on the back of the postcard.)

Our address: KSP, KZVI FMFI UK, Mlynska dolina, 842 48 Bratislava, Slovakia.