Is this some homework? There are many people going around asking the same thing. You can find hints in https://elixirforum.com by searching for "sum of subsets".
#Sum of Subsets - How to solve using backtracking
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I guess you need to make an account to read it
@round oracle @stable sand Can you please guide me to do sum_of_one ? I want only some help i try to do it for weeks but nothing happens ?
I cannot, I don't know what sum_of_one means. did you look at the forum thread?
which forum thread?