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- Atul Rokade November 14, 2013Time complexity O(n) and space complexity O(n) as follows.
1) Compare each even indexed element with odd indexed element, return when any two element are equal.
2) Compare each 1st,4th,7th,....indexed element with 2nd and 3rd, 5th and 6th, 8th and 9th,.... resp.
return when any two element are equal.