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Day 01.

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Jonathan Chan 2018-12-01 00:41:50 -08:00
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commit f46e146baa
28 changed files with 1018 additions and 2 deletions
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README.md
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@ -8,7 +8,7 @@ To arrive at [⟨ortho|normal⟩](https://hilb.ert.space) as December comes.
| Day | Runtime (s) | With `-O2` |
|-----|-------------|------------|
| 01 | |
| 01 | 0.015 |
| 02 | |
| 03 | |
| 04 | |

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package.yaml
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@ -21,6 +21,7 @@ description: Please see the README on GitHub at <https://github.com/iona
dependencies:
- base >= 4.7 && < 5
- containers
library:
source-dirs: src

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src/Day01.hs
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@ -1,6 +1,25 @@
module Day01 (main) where
import Data.Set (empty, insert, member)
freqChangeList :: String -> [Int]
freqChangeList = map (read . dropWhile (== '+')) . lines
totalFrequency :: [Int] -> Int
totalFrequency = foldr1 (+)
firstFreqTwice :: [Int] -> Int
firstFreqTwice changeList =
let freqs = scanl1 (+) $ cycle changeList
in dupl freqs empty
where dupl (f:fs) s =
if member f s
then f
else dupl fs (insert f s)
main :: IO ()
main = do
input <- readFile "input/01.txt"
print input
let changeList = freqChangeList input
print $ totalFrequency changeList
print $ firstFreqTwice changeList