Content:
The XOR total of an array is defined as the bitwise XOR of all its elements, or 0 if the array is empty.
- For example, the XOR total of the array
[2,5,6]is2 XOR 5 XOR 6 = 1.
Given an array nums, return the sum of all XOR totals for every subset of nums.
Note: Subsets with the same elements should be counted multiple times.
An array a is a subset of an array b if a can be obtained from b by deleting some (possibly zero) elements of b.文章来源：https://www.toymoban.com/news/detail-616471.html
Example 1:文章来源地址https://www.toymoban.com/news/detail-616471.html
Input: nums = [1,3] Output: 6 Explanation:
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