A hash is not sorted, by definition. You can sort the keys when you print it, though. 
my %counts;
for (0 ... $#out){
    $counts{$out[$_]} += $out1[$_];
}

[download]
should build the hash.

Update: the Perl 6 solution is much prettier, btw: 

for @out Z @out1 -> $char, $count {
     %hash{$char} += $count;
}

[download]

In reply to Re: confused with summing certain elements from an array by moritz
in thread confused with summing certain elements from an array by Anonymous Monk

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