A thousand billion pairs of arrays to compare? Even if comparing thousand pairs of arrays only takes 1 second (which is extremely fast given that you must read them from some form of external storage), it would take you more than 30 years to do so.
Where are you storing all these arrays? Suppose one array is only 1000 bytes long, you will need 2 x 10**15 bytes of storage at least (that is 2 million billion bytes of storage, or 2 thousand terabytes), not taking into account any overhead. Are you sure about your figures?
CountZero
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James
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