Created
June 24, 2012 21:03
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Modular exponentiation
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| (define (modexp a b q) | |
| (define (modmul a b) | |
| (modulo (* a b) q)) | |
| (do ((a a (modmul a a)) | |
| (b b (quotient b 2)) | |
| (r 1 (if (odd? b) (modmul r a) r))) | |
| ((zero? b) r))) |
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