day 2 complete

2 files changed, 69 insertions, 6 deletions

diff --git a/aoc2023/src/day2/solve.gleam b/aoc2023/src/day2/solve.gleam
index 5f16a12..916704c 100644
--- a/aoc2023/src/day2/solve.gleam
+++ b/aoc2023/src/day2/solve.gleam
@@ -1,12 +1,53 @@
 import adglent.{First, Second}
 import gleam/io
+import gleam/int
+import gleam/string
+import gleam/list
+
+pub type Game {
+  Game(red: Int, blue: Int, green: Int)
+}
+
+fn parse(input: String) -> List(List(Game)) {
+  use line <- list.map(string.split(input, "\n"))
+  let [_, rounds] = string.split(line, on: ": ")
+  use match <- list.map(string.split(rounds, on: "; "))
+  use acc, draw <- list.fold(
+    over: string.split(match, on: ", "),
+    from: Game(0, 0, 0),
+  )
+  let [n_str, color] = string.split(draw, " ")
+  let assert Ok(n) = int.parse(n_str)
+  case color {
+    "red" -> Game(..acc, red: n)
+    "blue" -> Game(..acc, blue: n)
+    "green" -> Game(..acc, green: n)
+  }
+}
 
 pub fn part1(input: String) {
-  todo as "Implement solution to part 1"
+  use acc, game, i <- list.index_fold(parse(input), 0)
+  case list.any(game, fn(m) { m.red > 12 || m.green > 13 || m.blue > 14 }) {
+    False -> acc + i + 1
+    True -> acc
+  }
 }
 
 pub fn part2(input: String) {
-  todo as "Implement solution to part 2"
+  {
+    use game <- list.map(parse(input))
+    use acc, match <- list.fold(game, Game(0, 0, 0))
+    let Game(red: red, green: green, blue: blue) = match
+    Game(
+      red: int.max(red, acc.red),
+      blue: int.max(blue, acc.blue),
+      green: int.max(green, acc.green),
+    )
+  }
+  |> list.fold(
+    from: 0,
+    with: fn(acc, g: Game) { acc + g.red * g.blue * g.green },
+  )
 }
 
 pub fn main() {
diff --git a/aoc2023/test/day2/day2_test.gleam b/aoc2023/test/day2/day2_test.gleam
index 9a28304..6cddda1 100644
--- a/aoc2023/test/day2/day2_test.gleam
+++ b/aoc2023/test/day2/day2_test.gleam
@@ -4,22 +4,44 @@ import adglent.{type Example, Example}
 import day2/solve
 
 type Problem1AnswerType =
-  String
+  Int
 
 type Problem2AnswerType =
-  String
+  Int
 
 /// Add examples for part 1 here:
 /// ```gleam
 ///const part1_examples: List(Example(Problem1AnswerType)) = [Example("some input", "")]
 /// ```
-const part1_examples: List(Example(Problem1AnswerType)) = []
+const part1_examples: List(Example(Problem1AnswerType)) = [
+  Example(
+    "Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green",
+    8,
+  ),
+]
 
 /// Add examples for part 2 here:
 /// ```gleam
 ///const part2_examples: List(Example(Problem2AnswerType)) = [Example("some input", "")]
 /// ```
-const part2_examples: List(Example(Problem2AnswerType)) = []
+const part2_examples: List(Example(Problem2AnswerType)) = [
+  Example(
+    "Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green",
+    2286,
+  ),
+    Example(
+    "Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green",
+    48,
+  ),
+]
 
 pub fn part1_test() {
   part1_examples