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Node = Struct.new(*%i[x y size used avail use])
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nodes = ARGF
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.read
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.scan(%r|/dev/grid/node-x(\d+)-y(\d+)\s+(\d+)T\s+(\d+)T\s+(\d+)T\s*(\d+)%|)
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.map {|match| Node.new(*match.map(&:to_i)) }
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p nodes.permutation(2).count {|a,b|
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a.used != 0 && a.used <= b.avail
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}
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