[ Duplicate post. Please ignore ]

Use a trie instead of a hash table.

For future reference, 

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

[download]

can be shortened to 

    ++$wordCount{$_};

[download]

It won't help your memory problem, just your code clarity.

In reply to [DUP] Re: Out of Memory by ikegami
in thread Out of Memory by instinct_4ever

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