From 59293af2d77a6bd540a55788d3fec54763a5831a Mon Sep 17 00:00:00 2001
From: Sloane Perrault <sloane.perrault@gmail.com>
Date: Wed, 21 Sep 2022 09:19:52 -0400
Subject: [PATCH] solve: day 2, part 1

---
 2020/02/README.md |    5 +
 2020/02/input.txt | 1000 +++++++++++++++++++++++++++++++++++++++++++++
 2020/02/part1.hs  |   35 ++
 2020/README.md    |    7 +-
 4 files changed, 1044 insertions(+), 3 deletions(-)
 create mode 100644 2020/02/README.md
 create mode 100644 2020/02/input.txt
 create mode 100755 2020/02/part1.hs

diff --git a/2020/02/README.md b/2020/02/README.md
new file mode 100644
index 0000000..0746f57
--- /dev/null
+++ b/2020/02/README.md
@@ -0,0 +1,5 @@
+# Day 2
+
+## Part 1
+
+Spent some time reading up on how to define a custom instance of `Read`. Pretty simple otherwise. Surprised `countElem` isn't in Prelude.
diff --git a/2020/02/input.txt b/2020/02/input.txt
new file mode 100644
index 0000000..2da5b54
--- /dev/null
+++ b/2020/02/input.txt
@@ -0,0 +1,1000 @@
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diff --git a/2020/02/part1.hs b/2020/02/part1.hs
new file mode 100755
index 0000000..9da58d8
--- /dev/null
+++ b/2020/02/part1.hs
@@ -0,0 +1,35 @@
+#!/usr/bin/env runghc
+
+import Data.Char
+
+data PasswordEntry = PasswordEntry { min :: Int, max :: Int, character :: Char, password :: String }
+  deriving (Show)
+
+-- This could be a lot better...
+instance Read PasswordEntry where
+  readsPrec _ input =
+    let (min', rest) = span isDigit input
+        min = read min' :: Int
+        (_, rest') = splitAt 1 rest
+        (max', rest'') = span isDigit rest'
+        max = read max' :: Int
+        (_:char:_:_:password) = rest''
+      in
+      [(PasswordEntry min max char password, "")]
+
+
+main = interact solve
+
+solve = show . length . filter (isValidPasswordEntry . readPasswordEntry) . lines
+
+readPasswordEntry :: String -> PasswordEntry
+readPasswordEntry = read
+
+isValidPasswordEntry (PasswordEntry min max char pass) =
+  let countedElem = countElem char pass
+   in min <= countedElem && max >= countedElem
+
+countElem _ [] = 0
+countElem a (x:xs)
+  | a == x = 1 + countElem a xs
+countElem a (_:xs) = countElem a xs
diff --git a/2020/README.md b/2020/README.md
index 157bc03..a267682 100644
--- a/2020/README.md
+++ b/2020/README.md
@@ -12,13 +12,14 @@ asdf install
 
 ## Table of Contents
 
-| S   | M   | T   | W   | T   | F   | S   |
+|  S  |  M  |  T  |  W  |  T  |  F  |  S  |
 | :-: | :-: | :-: | :-: | :-: | :-: | :-: |
-|     |     | [1] | 2   | 3   | 4   | 5   |
-| 6   | 7   | 8   | 9   | 10  | 11  | 12  |
+|     |     | [1] | [2] |  3  |  4  |  5  |
+|  6  |  7  |  8  |  9  | 10  | 11  | 12  |
 | 13  | 14  | 15  | 16  | 17  | 18  | 19  |
 | 21  | 22  | 23  | 24  | 25  |     |     |
 
 [asdf]: https://asdf-vm.com/#/
 [haskell]: https://www.haskell.org
 [1]: ./01
+[2]: ./02