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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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13
Task/Jacobi-symbol/Scheme/jacobi-symbol.ss Normal file
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(define jacobi (lambda (a n)
(let ((a-mod-n (modulo a n)))
(if (zero? a-mod-n)
(if (= n 1)
1
0)
(if (even? a-mod-n)
(case (modulo n 8)
((3 5) (- (jacobi (/ a-mod-n 2) n)))
((1 7) (jacobi (/ a-mod-n 2) n)))
(if (and (= (modulo a-mod-n 4) 3) (= (modulo n 4) 3))
(- (jacobi n a-mod-n))
(jacobi n a-mod-n)))))))