if ($seen{$_}) {
        $seen{$_} += 1;
    }
    else {
        $seen{$_} = 1;
    }

[download]
can be simplified to 
    $seen{$_}++;

[download]

Your sort is also useless since hashes are unordered.

In reply to Re^2: how to count the no of repeats in a string by ikegami
in thread how to count the no of repeats in a string by koleti

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