Created
May 27, 2013 07:45
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| n, k = gets.split.map(&:to_i) | |
| processed = (0...1<<n).to_a.sort_by { |x| [x.to_s(2).count("1"), x] } | |
| puts processed[k-1].to_s(2).rjust(n, '0') |
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