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def f(a)
  b = a.select(&:odd?).sort
  a.map {|n| n.odd? ? b.shift : n}
end
p f [6, 5, 4, 3, 2, 1]
p f [6, 5, 3, 1]

Success #stdin #stdout 0.01s 6476KB

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Standard input is empty

stdout

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[6, 1, 4, 3, 2, 5]
[6, 1, 3, 5]

https://ideone.com/EUWgwy

language:

Ruby (ruby 2.5.5)

created:

visibility:

secret

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