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#!/usr/bin/awk -f
function abs(n) {
return n < 0 ? -n : n
}
{
xs[NR] = $1
ys[NR] = $2
}
END {
asort(xs)
asort(ys)
for (i in xs)
d += abs(xs[i] - ys[i])
print d
}
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