As a University Student:

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• ACM International Collegiate Programming Contest

  Together with the local (sub)contests
  • 2002, Honolulu: Eleventh place in the ACM ICPC World Finals
  • 2001, Warszawa: First place in the Central European Programming Contest (defeating the next year's World Finals winners!)
  • 2001, Wrocław: First place w VI Akademickich Mistrzostwach Polski w Programowaniu Zespołowym (as above)
  • 1999, Prague: Second place in the Central European Regional Contest (the name is different, but it's the same competition)
  • 1999, Warszawa: First place w IV Akademickich Mistrzostwach Polski w Programowaniu Zespołowym
  
  In 2001/2002, I've been in a team with Łukasz Kamiński and Tomek Malesiński, and in 1999 with Łukasz Anforowicz and Marek Futrega.
  
  

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• TopCoder

  So far:
  • 2008, Las Vegas, NV: Third place in TopCoder Open
  • 2007, Las Vegas, NV: Third place in TopCoder Open
  • 2006, San Diego, CA: Seventh place in TopCoder Collegiate Challenge
  • 2006, Las Vegas, NV: Semifinalist in the TopCoder Open
  • 2005, Santa Clara, CA: First place in the TopCoder Open
  • 2005, Santa Clara, CA: Fifth (approximately) place in the TopCoder Collegiate Challenge
  • 2004, Boston, MA: Sixth (approximately) place in the TopCoder Collegiate Challenge
  My rank is frequently changing, my top rank was a third place (not counting the period of time when it was a second place due to a misfeature of the rating system).
  My TopCoder "trading card"
  My TopCoder member profile

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• Google Code Jam

  So far:
  • 2010, Dublin: finals
  • 2008, Mountain View, CA: place
  • 2006, Dublin: Fifth place in Google Code Jam Europe
  • 2004, Mountain View, CA: Ninth place in Google Code Jam

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• Facebook Hacker Cup
  • 2011, Palo Alto, CA: finals

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• Mathematical competitions for students

  • 2003: An unknown place in the mathematics competition in Iran
  • 2003, Cluj, Romania: Sixteenh place (first prize) in International Mathematics Competition for University Students
  • 2003, Ostrava: 11-16th place in Vojtěch Jarník Annual International Mathematical Competition
  • 2002, Warszawa: Twenty-first place (first prize) in International Mathematics Competition for University Students
  • 2002, Ostrava: Sixth place in Vojtěch Jarník Annual International Mathematical Competition

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• Other contests

  • International Obfuscated C Code Contest : Best One-Liner (2004)
  • Międzynarodowe Mistrzostwa w Grach Matematycznych i Logicznych - finał krajowy: first place (2008), third place (?) (1997); internationally - 6th place (2008)
  • Wielka Przesmycka, Wrocław : first place (2004), eighth place (2002)
  • Internetowy Turniej Programów Walcz+cych : third place (2004) — my program with comments

Before:

On the other side:

• Central European Programming Contest, 2001 i 2002: wrote problems: Rhombs, Family and Football.
• Obóz Naukowo-Treningowy im. Antoniego Kreczmara, 2006 i 2007: wrote problems: Dinozaury, Hodowca Drzew, Rytuał, Generał (EN) (and some stories for other problems :)
• Potyczki Algorytmiczne, 2007-2011: Wrote problems: Pytania, Ryby
• 2006 (?) - Warsaw University eliminations for ACM: Wrote problem Krzywy York
• TopCoder - wrote SRM 412