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Extended Euclidean returns a triple (gcd, x, y) such that
a*x + b*y = gcd:
let rec ext_gcd a b =
if b = 0 then (a, 1, 0)
else
let (g, x1, y1) = ext_gcd b (a mod b) in
(g, y1, x1 - (a / b) * y1)
let mod_inverse a m =
let (_, x, _) = ext_gcd a m in
((x mod m) + m) mod m
Three invariants checked:
inv(3, 11) = 4 (3*4 = 12 = 1 mod 11)
inv(5, 26) = 21 (5*21 = 105 = 1 mod 26)
inv(7, 13) = 2 (7*2 = 14 = 1 mod 13)
sum = 27
Tests recursive triple-tuple return, tuple-pattern destructuring on
let-binding (with wildcard for unused fields), and nested
let-binding inside the recursive call site.
72 baseline programs total.
77 lines
1.6 KiB
JSON
77 lines
1.6 KiB
JSON
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