How about 
use List::Util "min";
...
my $words = min(@words1, @words2);
$total += $words;
$bad += grep $words1[$_] ne $words2[$_], 0 .. ($words - 1);
...
print "good:", $total - $bad;

[download]
possibly switching max for min.

In reply to Re^4: compare files by words by ysth
in thread compare files by words by jajaja

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