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krupenik/gist:6248650

Last active December 21, 2015 04:19
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gistfile1.rb
#! /usr/bin/env ruby
src = [["Ukraine", ["Kyiv", "Kharkov"]], ["France", ["Paris", "Marseilles"]], ["Poland", ["Warsaw", "Krakow"]]]
dst = src.flat_map { |(country, cities)| cities.map { |city| "#{country}/#{city}" }}
puts dst.map { |i| [i, dst - [i]]}.inspect
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