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By Andrey_Karpov_2009
via drdobbs.com
Submitted: Sep 25 2013 / 02:01

Last week, I introduced a programming style that never changes the value of a variable once that value has been established. In that article, I made a statement that one reader questioned: If we try to write this program recursively using the technique we mentioned earlier, we find that each recursive call passes the entire result array as an argument. As a result, the program's runtime will be quadratic in the number of iterations — hardly a happy state of affairs.
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