From: Neil Smith <neil.git@njae.me.uk>
Date: Wed, 19 Sep 2018 10:23:31 +0000 (+0100)
Subject: Done task 2
X-Git-Url: https://git.njae.me.uk/?a=commitdiff_plain;h=9a82c8cdb3c4e92caa9d468045935e467c0117d8;p=summerofcode2018soln.git

Done task 2
---

diff --git a/data/02-rainfall.txt b/data/02-rainfall.txt
new file mode 100644
index 0000000..c66e645
--- /dev/null
+++ b/data/02-rainfall.txt
@@ -0,0 +1,213 @@
+11
+12
+2
+4
+9
+8
+5
+0
+4
+9
+6
+0
+2
+8
+7
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+4
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+0
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+2
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+10
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+5
+4
+9
+7
+11
+3
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+2
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+4
+5
+2
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+10
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+2
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+4
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+5
+9999
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+0
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+12
+12
+17
+9
+19
+5
+23
+0
+1
+8
+18
+2
+4
+23
+9
+7
+7
+3
+16
+9
+14
+18
+20
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+16
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+16
+15
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+21
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+0
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+3
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+2
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+2
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diff --git a/src/task2/task2.hs b/src/task2/task2.hs
new file mode 100644
index 0000000..3508d35
--- /dev/null
+++ b/src/task2/task2.hs
@@ -0,0 +1,26 @@
+import Data.List (foldl')
+
+main :: IO ()
+main = do 
+        record_text <- readFile "data/02-rainfall.txt"
+        let records = readRecords record_text
+        print $ part1 records
+        print $ part2 records
+        print $ part2a records
+
+readRecords :: String -> [Int]
+readRecords = takeWhile (< 9999) . map read . lines
+
+part1 :: [Int] -> Int
+part1 = length 
+
+part2 :: [Int] -> Int
+part2 records = round $ ((fromIntegral $ sum records) :: Double)
+                      / (fromIntegral $ length records)
+                      
+
+-- Doing part 2 as a fold, so only traverse the list once
+part2a :: [Int] -> Int
+part2a records = round $ ((fromIntegral sumR) :: Double) / (fromIntegral count)
+    where 
+        (sumR, count) = foldl' (\(s, n) r -> (s+r, n+1)) (0, 0) records
diff --git a/summerofcode2018soln.cabal b/summerofcode2018soln.cabal
index 715e6cb..c09637b 100644
--- a/summerofcode2018soln.cabal
+++ b/summerofcode2018soln.cabal
@@ -40,3 +40,9 @@ executable task1-mpc
   build-depends:       base >= 4.7 && < 5
                      , text
                      , megaparsec
+
+executable task2
+  hs-source-dirs:      src/task2
+  main-is:             task2.hs
+  default-language:    Haskell2010
+  build-depends:       base >= 4.7 && < 5