Implement the following function that returns a vector of vectors of Item, each of which is a subset of elements chosen from the given vector a[first…last]:  /* if a is {1,2,3}, first=0, last=2, the function shall returns a vector of the following vectors:    {}, {1}, {2}, {3}, {1,2},{1,3}, {2,3},{1,2,3}, all subsets of a[0…2].    Precondition: last-first+1>=1, i.e., there is at least one element in the a[first…last]    Note 1)if the length of a[first…last] is n, then the function should return a vector of 2n vectors      2) The order of these subsets does not need to match what’s listed here…  */ vector> subsets (const vector & a, int first, int last)   code

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Array

The simplest way to start thinking about an array is as a collection, or a set of elements. In programming, these elements may be constants, variables, functions and pointers.