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class Solution {
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  int sum = 0;
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  public int subsetXORSum(int[] nums) {
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    sum = 0;
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    return getAns(nums, 0, 0);
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  }
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  int getAns(int[] arr, int i, int cur) {
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    if (i == arr.length) {
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      return cur;
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    }
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    return getAns(arr, i + 1, cur ^ arr[i]) + getAns(arr, i + 1, cur);
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  }
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}