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house9/pairs.rb

Forked from lexun/pairs.rb
Last active August 29, 2015 13:56
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pairs.rb
require 'ap'
$pair_size = (ENV['PAIR_SIZE'] || 2).to_i
def pairs(participants)
pairs = participants.shuffle.each_slice($pair_size).to_a
if pairs.last.size == 1
loner = pairs.pop
pairs.last << loner.first
end
pairs
end
p ap(pairs(ARGF.read.split))
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