A concise O(N) solution: 
my @top = @masterArray[0..2];
@top = (sort { $b->[2] <=> $a->[2] } @top, $masterArray[$_])[0..2] for
+ 3..$#masterArray;

[download]
Though, I have no idea how fast it would be.

In reply to Re: sorting array of arrays reference by salva
in thread sorting array of arrays reference by kimlid2810

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