Clearly this is an external sorting question..
  Merge sort Can Be Used..

On 10/27/11, shiva@Algo <[email protected]> wrote:
> Given a file containing roughly 300 million social security
> numbers(9-digit numbers), find a 9-digit number that is not in the file.
> You have unlimited drive space but only 2megabytes of RAM at your
> disposal.
>
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