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arr = (1..10).to_a
result = []
0.upto(10) do |i|
	tmp = arr.combination(i).to_a
	tmp.map! { |e| e.sort }
	result += tmp
end
result.sort_by! { |e| [e.length, e] }
# Numeracja tablicy od 0 - szukamy więc elementu o indeksie 899
puts result[899]
Success #stdin #stdout 0s 28352KB
comments (?)
stdin 
Standard input is empty
stdout 
1
2
5
6
7
8
10
https://ideone.com/dG5OCi
language:
Ruby (ruby 2.5.5)
created:
5 years ago
visibility:
public

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