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  1. 34
      AdventOfCode2020.cabal
  2. 5
      CHANGELOG.md
  3. 14
      Main.hs
  4. 2
      Setup.hs
  5. 7
      hie.yaml
  6. 200
      input/day1
  7. 19
      src/Day1.hs

@ -1,34 +0,0 @@
cabal-version: 2.4
-- Initial package description 'AdventOfCode2020.cabal' generated by 'cabal
-- init'. For further documentation, see
-- http://haskell.org/cabal/users-guide/
name: AdventOfCode2020
version: 0.1.0.0
-- synopsis:
-- description:
-- bug-reports:
-- license:
license-file: LICENSE
author: Gaël Depreeuw
maintainer: gael@depreeuw.dev
-- copyright:
-- category:
extra-source-files: CHANGELOG.md, README.md
library
exposed-modules: Day1
-- other-modules:
-- other-extensions:
build-depends: base ^>=4.13.0.0
, containers ^>=0.6.4.1
hs-source-dirs: src
default-language: Haskell2010
executable AdventOfCode2020
main-is: Main.hs
-- other-modules:
-- other-extensions:
build-depends: base ^>=4.13.0.0, AdventOfCode2020
-- hs-source-dirs:
default-language: Haskell2010

@ -1,5 +0,0 @@
# Revision history for AdventOfCode2020
## 0.1.0.0 -- YYYY-mm-dd
* First version. Released on an unsuspecting world.

@ -1,14 +0,0 @@
module Main where
import qualified Day1 (fixExpenseReport)
day1 :: IO ()
day1 = do
r <- readFile "./input/day1"
putStr "[Day 1-1] fix: "
print . Day1.fixExpenseReport . fmap read . lines $ r
main :: IO ()
main = do
day1

@ -1,2 +0,0 @@
import Distribution.Simple
main = defaultMain

@ -1,7 +0,0 @@
cradle:
cabal:
- path: "src"
component: "lib:AdventOfCode2020"
- path: "./Main.hs"
component: "AdventOfCode2020:exe:AdventOfCode2020"

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1834
1546
1119
1870
1193
1198
1542
1944
1817
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1856
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1425
1835
1520
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1130
2004
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1549
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1507
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1449
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1811
906
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1945
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1556
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1953
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2005
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1529
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1996
1939
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1531
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1897
1152
1321
1770
897
1750
1111
1772
1615
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1359
1470
1610
1362
1973
1892
1830
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1341
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42
1246
1447
1800
1524
1214
1784
1664
1882
1989
1797
1211
1170
1854
1287
1641
1760

@ -1,19 +0,0 @@
module Day1 (fixExpenseReport) where
import qualified Data.IntSet as DIS
import Data.Maybe (mapMaybe)
yearToFind :: Int
yearToFind = 2020
-- Turn the list into an IntSet. For each element in the set, look up the
-- number in the set to make it 2020. If found, return the multiplication of
-- the two numbers.
fixExpenseReport :: [Int] -> Int
fixExpenseReport expenses =
let s = DIS.fromList expenses in
head $ mapMaybe (`findOther` s) expenses
findOther :: Int -> DIS.IntSet -> Maybe Int
findOther n s = let n' = yearToFind - n in
if DIS.member n' s then Just (n*n') else Nothing
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