day #3
Created by wgaffa on December 18, 2022
ENYEYOU7D6PVVHJNAPGBIOETQLXMWOWD2TULOQXCPNQEYQNDTMWAC Dependencies
In channels
main
Change contents
File addition: day3.txt
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addition: day3-sample.txt
[2.18]vJrwpWtwJgWrhcsFMMfFFhFpjqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSLPmmdzqPrVvPwwTWBwgwMqvLMZHhHMvwLHjbvcjnnSBnvTQFnttgJtRGJQctTZtZTCrZsJsPPZsGzwwsLwLmpwMDwFile addition: Day3.hs
[3.1]module Main whereimport Data.Bifunctor (bimap, first, second)import Data.Bitsimport Data.Char (isAlpha, isUpper, ord)import Data.List (intersect, nub, sort)import Aocmain :: IO ()main = docontent <- input 3let run = Aoc.run contentrun 7817 (strategy fault id . lines)run 2444 (strategy partTwo group . lines)wherestrategy a b = sum . map (priority . a) . bpartTwo = head . foldl1 intersecttype Rucksack = [Item]type Compartment = [Item]type Item = Chartype Group = [Rucksack]priority :: Item -> Intpriority x| not (isAlpha x) = error "malformed input"| isUpper x = lexical_ord + 26| otherwise = lexical_ordwherelexical_ord = ord x .&. 0b11111compartments :: String -> (Compartment, Compartment)compartments xs = splitAt half xswherehalf = length xs `shiftR` 1fault :: Rucksack -> Itemfault = head . uncurry intersect . compartmentsgroup :: [Rucksack] -> [Group]group [] = []group (a : b : c : xs) = [a, b, c] : group xs