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Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
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map = ARGF.read.split("\n").map(&:chars)
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rows = map.size
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cols = map[0].size
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slopes = [
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[1, 1],
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[3, 1],
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[5, 1],
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[7, 1],
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[1, 2],
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]
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puts slopes.map {|dx,dy|
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map.each_slice(dy).map(&:first)
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.map.with_index {|row,i| row[dx*i % cols] }
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.count(?#)
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}.reduce(&:*)
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