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Compression Algorithm wanted

I have the following problem:

A compiled function of mine does frequent writes to a list, constantly churning
out new integers within a certain range. Unfortunately, writing to lists from 
inside a compiled function is very slow, so, naturally, I want to reduce the
number of writes. Currently, I am using a method to reduce writes by
expressing consecutive numbers as the digits of an integer (eg. {1,2,3} becomes

Does anyone have a method to "compress" the list of integers, or reduce the
number of writes in any way?

Any help is appreciated. Thanks in advance.

--Jonathan Lee


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