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  1. r = ->(a){(1..a.size).flat_map{|n|a.sort.combination(n).select{|c|c.reduce(:+)==10}.uniq}}
  2.  
  3. p r.([5, 2, 3, 5])
Success #stdin #stdout 0.02s 9784KB
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Standard input is empty
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[[5, 5], [2, 3, 5]]
https://ideone.com/uwSkNW
language:
Ruby (ruby 2.5.5)
created:
7 years ago
visibility:
public

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