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Disc = Struct.new(:positions, :start_position) do
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def position_at(time)
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(start_position + time) % positions
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end
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end
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discs = DATA.each_line.map {|line|
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/Disc #\d has (?<positions>\d+) positions; at time=0, it is at position (?<position>\d+)./ =~ line
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Disc.new(positions.to_i, position.to_i)
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}
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discs << Disc.new(11, 0)
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p (0..Float::INFINITY).find {|t|
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discs.each.with_index.all? {|disc, index|
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disc.position_at(t + index) == 0
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}
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}
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__END__
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Disc #1 has 17 positions; at time=0, it is at position 15.
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Disc #2 has 3 positions; at time=0, it is at position 2.
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Disc #3 has 19 positions; at time=0, it is at position 4.
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Disc #4 has 13 positions; at time=0, it is at position 2.
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Disc #5 has 7 positions; at time=0, it is at position 2.
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Disc #6 has 5 positions; at time=0, it is at position 0.
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