Programming / coding competition / practice

• International Olympiad in Informatics, a similar competition for secondary school students.
• Information - ACM International Collegiate Programming Contest
• Google Code Jam, another programming competition
• Facebook Hacker Cup, another programming competition
• ICFP Programming Contest, another programming competition
• Internet Problem Solving Contest, another programming competition
• Online judge, a type of service to practice for programming contests and run them online (Wikipedia article includes links to several apps/systems)
• ShareCode ACM Online Judge, The ACM Online Judge and Social Network for acm lovers.
• PC², the Programming Contest Control System in support of Computer Programming Contest activities (used at ICPC World Finals until 2008)
• Kattis, KTH automated teaching tool (used at ICPC World Finals since 2009)
• SPOJ, an online judge system
• TopCoder, a company that administers programming competitions
• UVa Online Judge, an online judge system
• Project Euler, a websited dedicated to computational problems
• Colombian Collegiate Programming League
• http://coderbyte.com/
• Project Euler is probably the most popular coding challenge website in the world
• http://www.reddit.com/r/dailyprogrammer
• https://codility.com/train/
• http://www.spoj.com/
• https://www.codeeval.com/
• http://www.codechef.com/
• https://www.hackerrank.com/
• http://www.talentbuddy.co/
• http://www.codewars.com/
• http://rosalind.info/problems/locations/
• http://fightcodegame.com/
• http://www.hackerearth.com/
• http://www.talentbuddy.co/
• www.codecombat.com
• www.programmingpraxis.com
• http://leetcode.com/
• leetcode.com