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Odd Even Algorithm Puzzle

Source:http://thomer.com/riddles/

Problem:

If you have an array with random odd and even numbers, what is the most efficient algorithm you can think of to put all even numbers on one side and all odd numbers on the other side in this array? What is the complexity of your algorithm?

Update ( 21 June 2014)

Solution posted by nick, Abhishek, Khalil Sawant, Sandeep, Stainless (Ameya Ranade - CSE IITB 2009 Alumnus, Google Engineer, Facebook Engineer), Piyush Sao, Sakshi, Kaushal and Pankaj Jindal in comments! Thanks.