Coding competitions around the world happen frequently. These competitions give you the challenge to solve complex problems and test your coding skills.
Some of the best coding competitions Available
1)Google Code Jam -https://code.google.com/codejam/
2)Codechef
3)SPOJ,
4)Codingbat,
5)Dream in code,
6)Microsoft Imagine Cup,
7)Topcoder contest,
8)interviewbit- www.interviewbit.com
9)hackerrank - www.hackerrank.com