From f32ac270c4b0cb654afd623f5e0e37bf61f7f27c Mon Sep 17 00:00:00 2001 From: Lucas Ransan Date: Thu, 15 Jul 2021 11:52:13 +0200 Subject: Miranda week 121 task 1 --- challenge-121/luc65r/miranda/ch-1.m | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100755 challenge-121/luc65r/miranda/ch-1.m diff --git a/challenge-121/luc65r/miranda/ch-1.m b/challenge-121/luc65r/miranda/ch-1.m new file mode 100755 index 0000000000..1cc4ab9794 --- /dev/null +++ b/challenge-121/luc65r/miranda/ch-1.m @@ -0,0 +1,18 @@ +#!/usr/bin/env -S mira -exec + +main = ((++ "\n") . show . frombase2 . modify (1 -) n . tobase2) m + where + m = numval ($* ! 1) + n = numval ($* ! 2) - 1 + +tobase2 :: num -> [num] +tobase2 = map (mod 2) . takewhile (~= 0) . iterate (div 2) + +frombase2 :: [num] -> num +frombase2 = foldl1 ((+) . (2 *)) . reverse + +modify :: (* -> *) -> num -> [*] -> [*] +modify op n l = map2 f (index l) l + where + f i = op, if i == n + = id, otherwise -- cgit