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How to find all sub arrays from an array in o(n) complexity?

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How to find all sub arrays from an array in o(n) complexity?
posted May 5, 2014 by Atul Mishra

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I don't think it is possible since a given array has n* (n+1)/2 subarrays.So it's inherent complexity is O(n^2). Is it possible to find all permutations of a string in complexity less than O(n!)  :)... Also is it possible to find all combination of a group of items in complexity less than O(2^n).
commented May 6, 2014 by Prakash
I also have the similar understanding that finding all subarray of an array can not be achieved in o(n) time. Would you like to clarify further?
commented May 6, 2014 by Salil Agrawal

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