Given an array, we can generate an array which stores all the pairwise absolute difference of elements of original array. How can we find median of this new array. For example : A = {1,2,3,4} then we can generate difference array as G = {1,1,1,2,2,3} then median is 1.can it be done in better than quadratic time? Also what if we don't take absolute value of difference?