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Your solution is calling max(@xs) twice each step. This leads to O(2^n) growth for what should be an O(n) problem. Modifying it slightly to call max once and save the value in a temp variable should save considerable time on long lists.
sub max { my ($x, @xs) = @_; @xs ? do { my $m = maxdo(@xs); ($x, $m)[$x < $m] } : $x; }

In reply to Re^3: Finding the max()/min() by Ven'Tatsu
in thread Finding the max()/min() by dragonchild

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