I am trying to solve this problem http://www.geeksforgeeks.org/rearrange-array-alternating-positive-negative-items-o1-extra-space/ There is a solution, but in my opinion it's actually O(n^2) , because rotate function also is O(n). Am I right ? Is there a way to solve it in O(n) time and O(1) space ?
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Yes, the approach with O(1) extra space runs in quadratic time.
As far as I know, it's only possible to do this with O(1) extra space in a linked list, not in an array. In an array, the best I know with linear time and constant space is preserving the order of one of the sides: positive xor negative, not both.