You are right, it's utterly different algorithm.
The correct one is as follows:
@seq = ('acgt','actg','cggt','cggt', 'actg', 'actg');
@num = ('1234','2345','3244','3455', '5230', '100000' );
for( 0..$#seq ){
$struct{$seq[$_]}->[0] += $num[$_]
and
$struct{$seq[$_]}->[1]++
}
for( keys %struct ){
print "$_\t", $struct{$_}->[0] / $struct{$_}->[1], $/
}
__END__
STDOUT:
acgt 1234
cggt 3349.5
actg 35858.3333333333
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