Can someone tell about any online coding competiton

Answer 1

You can find online contest on any of these sites:
1. hackerrank.com
2. codechef.com
3. codeforces.com
4. csacademy.com
5. hackerearth.com
6. leetcode.com
......and many more
Some of these sites provides Tshirt or special prizes for top coders.
For beginners, the contest at hackerrank and codechef are good

Answer 2

7. topcoder
8. spoj <- can be useful for begginer (a lot of easy problems)

Answer 3

Thanks Bartosz for adding topcoder and spoj in the list 😃

Answer 4

Google code jam