Renamed files

day04/main.hs

@@ -1,49 +1,49 @@
-import Data.Char
-
+  -- main.hs as written by me, thuroughly fixed by <https://github.com/h7x4>
+main :: IO ()
 main = do  
-  let list = []
   file <- readFile "input.txt"
-  let inputLines = lines file
-  let stringpairs = map (splitWhen (==',')) inputLines
+  let
+    pairs :: [((Int, Int), (Int, Int))]
+    pairs = inputLinesToPairs file
 
-  let listpairs = map (map parseRange) stringpairs
-  let pairs = map (\x -> (head x, last x)) listpairs
+  putStrLn "Part 1: "
+  print $ part1 pairs
 
-  -- Each line of input has now gone from "1-2,3-4" to ((1,2),(3,4))
+  putStrLn "Part 2: "
+  print $ part2 pairs
 
-  let containedWithin = map (uncurry rangeIsContained) pairs
-  let containedCount = length $ filter (==True) containedWithin
-  print "Part 1: "
-  print containedCount
+-- Map each line of input from "1-2,3-4" to ((1,2),(3,4))
+inputLinesToPairs :: String -> [((Int, Int), (Int, Int))]
+inputLinesToPairs input = result
+  where
+  stringpairs :: [[String]]
+  stringpairs = map (splitWhen (==',')) $ lines input 
 
-  let overlap = map (uncurry rangeOverlaps) pairs
-  let overlapCount = length $ filter (==True) overlap
-  print "Part 2: "
-  print overlapCount
+  parseRange :: String -> (Int, Int)
+  parseRange pair = (read first, read second)
+    where
+      (first:second:_) = splitWhen (=='-') pair 
+
+  result :: [((Int, Int), (Int, Int))]
+  result = map (\x -> (head x, last x)) $ map (map parseRange) stringpairs
 
 
--- "1-3" -> (1,3)
-parseRange :: String -> (Int, Int)
-parseRange pair = do
-  let numbers = splitWhen (=='-') pair
-  let first = read (numbers !! 0) :: Int
-  let second = read (numbers !! 1) :: Int
-  (first, second)
+part1 :: [((Int, Int), (Int, Int))] -> Int
+part1 = length . filter (uncurry rangeIsContained)
 
--- True if the first range is entirely contained in the second range, or vice versa
-rangeIsContained :: (Int, Int) -> (Int, Int) -> Bool
-rangeIsContained (lo1, hi1) (lo2, hi2)
-  | lo1 <= lo2 && hi1 >= hi2 = True
-  | lo1 >= lo2 && hi1 <= hi2 = True
-  | otherwise = False
+part2 :: [((Int, Int), (Int, Int))] -> Int
+part2 = length . filter (uncurry rangeOverlaps)
 
 -- True if any part of the two ranges overlap
 rangeOverlaps :: (Int, Int) -> (Int, Int) -> Bool
-rangeOverlaps (lo1, hi1) (lo2, hi2)
-  | rangeIsContained (lo1, lo1) (lo2, hi2) = True
-  | lo2 >= lo1 && lo2 <= hi1 = True
-  | hi2 >= lo1 && hi2 <= hi1 = True
-  | otherwise = False
+rangeOverlaps (lo1, hi1) (lo2, hi2) = rangeIsContained (lo1, lo1) (lo2, hi2)
+                                   || (lo2 >= lo1 && lo2 <= hi1)
+                                   || (hi2 >= lo1 && hi2 <= hi1)
+
+-- True if the first range is entirely contained in the second range, or vice versa
+rangeIsContained :: (Int, Int) -> (Int, Int) -> Bool
+rangeIsContained (lo1, hi1) (lo2, hi2) = (lo1 <= lo2 && hi1 >= hi2)
+                                      || (lo1 >= lo2 && hi1 <= hi2)
 
 -- Modified from Prelude.words
 splitWhen :: (Char -> Bool) -> String -> [String]

day04/main_improved.hs

@@ -1,54 +0,0 @@
-  -- main.hs as written by me, thuroughly fixed by <https://github.com/h7x4>
-main :: IO ()
-main = do  
-  file <- readFile "input.txt"
-  let
-    pairs :: [((Int, Int), (Int, Int))]
-    pairs = inputLinesToPairs file
-
-  putStrLn "Part 1: "
-  print $ part1 pairs
-
-  putStrLn "Part 2: "
-  print $ part2 pairs
-
--- Map each line of input from "1-2,3-4" to ((1,2),(3,4))
-inputLinesToPairs :: String -> [((Int, Int), (Int, Int))]
-inputLinesToPairs input = result
-  where
-  stringpairs :: [[String]]
-  stringpairs = map (splitWhen (==',')) $ lines input 
-
-  parseRange :: String -> (Int, Int)
-  parseRange pair = (read first, read second)
-    where
-      (first:second:_) = splitWhen (=='-') pair 
-
-  result :: [((Int, Int), (Int, Int))]
-  result = map (\x -> (head x, last x)) $ map (map parseRange) stringpairs
-
-
-part1 :: [((Int, Int), (Int, Int))] -> Int
-part1 = length . filter (uncurry rangeIsContained)
-
-part2 :: [((Int, Int), (Int, Int))] -> Int
-part2 = length . filter (uncurry rangeOverlaps)
-
--- True if any part of the two ranges overlap
-rangeOverlaps :: (Int, Int) -> (Int, Int) -> Bool
-rangeOverlaps (lo1, hi1) (lo2, hi2) = rangeIsContained (lo1, lo1) (lo2, hi2)
-                                   || (lo2 >= lo1 && lo2 <= hi1)
-                                   || (hi2 >= lo1 && hi2 <= hi1)
-
--- True if the first range is entirely contained in the second range, or vice versa
-rangeIsContained :: (Int, Int) -> (Int, Int) -> Bool
-rangeIsContained (lo1, hi1) (lo2, hi2) = (lo1 <= lo2 && hi1 >= hi2)
-                                      || (lo1 >= lo2 && hi1 <= hi2)
-
--- Modified from Prelude.words
-splitWhen :: (Char -> Bool) -> String -> [String]
-splitWhen p s = case dropWhile p s of
-  "" -> []
-  s' -> w : splitWhen p s''
-    where (w, s'') = break p s'
-

day04/main_original.hs

@@ -0,0 +1,54 @@
+import Data.Char
+
+main = do  
+  let list = []
+  file <- readFile "input.txt"
+  let inputLines = lines file
+  let stringpairs = map (splitWhen (==',')) inputLines
+
+  let listpairs = map (map parseRange) stringpairs
+  let pairs = map (\x -> (head x, last x)) listpairs
+
+  -- Each line of input has now gone from "1-2,3-4" to ((1,2),(3,4))
+
+  let containedWithin = map (uncurry rangeIsContained) pairs
+  let containedCount = length $ filter (==True) containedWithin
+  print "Part 1: "
+  print containedCount
+
+  let overlap = map (uncurry rangeOverlaps) pairs
+  let overlapCount = length $ filter (==True) overlap
+  print "Part 2: "
+  print overlapCount
+
+
+-- "1-3" -> (1,3)
+parseRange :: String -> (Int, Int)
+parseRange pair = do
+  let numbers = splitWhen (=='-') pair
+  let first = read (numbers !! 0) :: Int
+  let second = read (numbers !! 1) :: Int
+  (first, second)
+
+-- True if the first range is entirely contained in the second range, or vice versa
+rangeIsContained :: (Int, Int) -> (Int, Int) -> Bool
+rangeIsContained (lo1, hi1) (lo2, hi2)
+  | lo1 <= lo2 && hi1 >= hi2 = True
+  | lo1 >= lo2 && hi1 <= hi2 = True
+  | otherwise = False
+
+-- True if any part of the two ranges overlap
+rangeOverlaps :: (Int, Int) -> (Int, Int) -> Bool
+rangeOverlaps (lo1, hi1) (lo2, hi2)
+  | rangeIsContained (lo1, lo1) (lo2, hi2) = True
+  | lo2 >= lo1 && lo2 <= hi1 = True
+  | hi2 >= lo1 && hi2 <= hi1 = True
+  | otherwise = False
+
+-- Modified from Prelude.words
+splitWhen :: (Char -> Bool) -> String -> [String]
+splitWhen p s = case dropWhile p s of
+  "" -> []
+  s' -> w : splitWhen p s''
+    where (w, s'') = break p s'
+