Sum of All Subset XOR Totals

Statement

Given an array of integers, nums, compute and return the sum of XOR totals for all its possible subsets.

• A subset is any combination of elements from the original array, nums. This includes the empty subset (containing no elements) and the subset that includes all array elements.

• The XOR total of a subset results from applying the XOR operation to all the elements in that subset.

Note: If the nums array has duplicate elements, then subsets that contain the same elements but with different indexes are treated as separate. Each subset’s ...