Day 2

2 files changed, 197 insertions, 7 deletions

diff --git a/2023/inputs/day_2.txt b/2023/inputs/day_2.txt
new file mode 100644
index 0000000..b7ed86c
--- /dev/null
+++ b/2023/inputs/day_2.txt
@@ -0,0 +1,100 @@
+Game 1: 1 green, 6 red, 4 blue; 2 blue, 6 green, 7 red; 3 red, 4 blue, 6 green; 3 green; 3 blue, 2 green, 1 red
+Game 2: 2 blue, 4 red, 7 green; 17 red, 3 blue, 2 green; 3 green, 14 red, 1 blue
+Game 3: 12 blue, 3 red, 1 green; 8 blue, 9 red; 1 blue, 1 green, 9 red; 4 blue, 1 green, 9 red
+Game 4: 2 red, 10 green, 5 blue; 11 blue, 4 green; 6 green, 7 blue, 2 red; 4 blue, 9 green; 6 green, 1 red, 5 blue
+Game 5: 10 green, 5 blue, 5 red; 10 blue, 13 green; 2 red, 12 blue; 9 green, 9 red
+Game 6: 2 red, 3 green; 1 blue, 15 red, 2 green; 1 green, 7 red
+Game 7: 16 blue, 4 green, 9 red; 6 red, 2 blue, 12 green; 2 red, 5 green, 14 blue; 11 blue, 13 red; 10 blue, 3 red, 17 green; 1 green, 12 blue
+Game 8: 14 red, 12 green, 1 blue; 5 blue, 7 green, 12 red; 8 green, 1 red, 8 blue; 8 blue, 2 green, 15 red; 9 blue, 12 red, 10 green; 4 blue, 15 red, 1 green
+Game 9: 2 red, 7 green, 5 blue; 1 red, 5 blue, 13 green; 5 blue
+Game 10: 4 red, 1 green, 4 blue; 7 green, 8 blue, 4 red; 9 green, 3 red, 8 blue; 5 red, 2 green, 7 blue
+Game 11: 4 green, 1 blue, 1 red; 3 green, 3 red, 1 blue; 3 green, 1 red, 1 blue
+Game 12: 7 red, 6 green, 12 blue; 6 blue, 8 green, 3 red; 12 green, 5 blue, 4 red; 3 red, 16 blue, 8 green; 12 red, 11 green, 6 blue
+Game 13: 2 green, 5 red, 12 blue; 8 green, 12 red, 4 blue; 6 blue, 7 green, 13 red
+Game 14: 1 blue, 7 green, 5 red; 1 blue, 8 green, 6 red; 3 green, 1 blue, 4 red
+Game 15: 11 red, 8 blue, 1 green; 11 red, 1 green; 3 green, 8 red, 2 blue; 4 blue, 11 red, 1 green; 5 blue, 5 red, 2 green
+Game 16: 18 green, 4 blue, 2 red; 5 blue, 11 green, 10 red; 8 red, 2 blue, 14 green; 8 red, 7 blue, 1 green; 3 red, 5 blue, 17 green; 6 blue, 5 green, 11 red
+Game 17: 3 blue, 3 red, 7 green; 4 blue, 1 red, 2 green; 5 blue, 3 green, 3 red
+Game 18: 2 blue, 2 red, 1 green; 4 blue, 2 red, 7 green; 10 blue, 4 red, 3 green; 5 blue, 3 red, 2 green; 4 green, 3 red, 4 blue; 3 green, 5 red, 5 blue
+Game 19: 2 red, 1 green, 1 blue; 8 red, 8 blue, 10 green; 16 green, 5 blue, 2 red; 4 red, 9 green
+Game 20: 12 red, 1 blue, 1 green; 4 blue, 2 green, 2 red; 3 blue; 5 red, 8 green; 14 red, 4 blue, 6 green
+Game 21: 9 red, 7 green, 1 blue; 5 green, 17 red, 11 blue; 14 red, 7 blue, 10 green; 7 green, 7 red, 10 blue; 6 blue, 6 green, 17 red; 16 red, 13 green, 7 blue
+Game 22: 4 blue, 1 red; 1 green, 8 blue; 1 green; 6 blue, 1 red
+Game 23: 13 red, 7 blue, 1 green; 4 green, 2 blue, 7 red; 4 green, 10 blue, 12 red
+Game 24: 9 green, 10 blue; 2 blue, 4 green, 4 red; 9 green, 1 red, 9 blue; 4 green, 5 red, 12 blue
+Game 25: 4 red, 1 green; 10 green, 6 red, 4 blue; 4 red, 1 blue, 7 green; 10 green, 3 red, 7 blue
+Game 26: 8 red, 1 green, 2 blue; 5 green, 5 red; 6 green, 19 red; 11 red, 2 blue, 8 green; 13 red, 2 blue, 5 green; 15 red, 2 blue, 10 green
+Game 27: 17 blue, 1 green; 2 red, 12 blue, 11 green; 16 green, 16 blue; 18 green, 4 blue; 10 blue, 1 red, 8 green
+Game 28: 5 red, 1 green, 1 blue; 3 blue, 8 green, 4 red; 6 green, 2 red, 2 blue
+Game 29: 3 green, 12 red, 11 blue; 2 green, 15 red, 8 blue; 13 red, 4 green; 17 red, 9 blue, 5 green
+Game 30: 10 green; 4 blue, 1 green; 2 blue, 2 red, 7 green; 5 green, 4 blue, 1 red; 4 red, 10 green, 1 blue
+Game 31: 15 blue, 2 red; 17 blue, 2 green; 19 blue, 6 red
+Game 32: 1 green, 7 red; 8 red, 1 blue; 5 red, 1 blue, 11 green; 3 blue, 17 red
+Game 33: 11 red, 9 green, 1 blue; 3 green, 8 blue; 10 red, 4 green, 8 blue; 6 red, 9 blue, 17 green; 15 green, 10 red, 4 blue; 1 red, 2 blue, 7 green
+Game 34: 13 red, 6 green; 6 red, 14 green, 2 blue; 3 red, 19 green; 9 green, 9 red
+Game 35: 7 green, 3 red; 12 green, 7 blue; 13 green, 7 red, 6 blue; 3 blue, 12 red
+Game 36: 6 blue, 11 green, 14 red; 3 blue, 12 green, 4 red; 18 red, 1 blue; 7 red, 9 green, 6 blue
+Game 37: 3 red, 16 blue, 6 green; 2 green, 7 blue; 8 blue, 3 red
+Game 38: 16 blue, 3 green, 14 red; 8 red, 15 blue; 17 red, 15 blue, 4 green; 1 green, 11 blue, 17 red; 3 green, 10 blue, 17 red
+Game 39: 1 green, 2 red, 5 blue; 12 blue, 12 green; 3 blue, 1 red
+Game 40: 1 red, 2 blue, 1 green; 7 green, 1 red, 6 blue; 8 blue, 1 red, 6 green; 12 blue, 1 red, 3 green; 4 green, 8 blue
+Game 41: 2 red, 2 blue, 5 green; 5 red, 8 blue; 4 green, 4 blue; 1 red, 11 blue
+Game 42: 1 red, 3 green, 13 blue; 13 blue, 7 green; 13 green; 1 red, 3 blue, 4 green; 13 blue, 7 green
+Game 43: 3 red, 4 green; 7 red, 11 blue, 3 green; 3 green, 12 red, 7 blue; 9 blue, 5 green
+Game 44: 4 blue, 9 red, 2 green; 10 blue, 5 red, 2 green; 9 red, 9 blue, 1 green; 8 blue, 2 green, 14 red; 3 blue, 3 green, 6 red; 4 blue, 3 green, 14 red
+Game 45: 1 red, 2 green, 2 blue; 2 green, 1 red; 1 green, 2 blue; 1 green, 1 red, 2 blue; 2 red, 2 blue, 1 green
+Game 46: 1 green, 3 red, 3 blue; 6 green, 2 blue, 4 red; 1 green, 3 blue, 1 red; 3 green, 1 blue, 5 red; 6 green; 1 red, 1 green, 2 blue
+Game 47: 18 green, 1 red, 7 blue; 6 blue, 19 green, 1 red; 5 blue, 7 green, 1 red; 1 red, 5 blue, 16 green; 15 green, 3 blue
+Game 48: 4 green, 8 blue, 8 red; 13 green, 5 red, 12 blue; 9 red, 6 blue, 10 green; 18 green, 3 blue, 4 red; 2 blue, 9 red, 8 green
+Game 49: 9 blue, 5 red, 9 green; 5 blue, 11 green, 5 red; 12 green, 6 blue
+Game 50: 13 red, 8 green, 3 blue; 2 red, 11 green, 3 blue; 16 red, 7 green; 3 blue, 11 green, 15 red; 10 red, 2 blue, 5 green; 7 green, 2 blue, 4 red
+Game 51: 2 red, 1 green, 3 blue; 2 green, 11 red, 17 blue; 2 red, 3 green, 6 blue; 4 red, 3 green, 6 blue; 13 red, 12 blue
+Game 52: 1 blue, 5 green; 20 green, 6 blue; 9 blue, 6 green; 11 green, 1 red; 1 green, 1 red, 1 blue
+Game 53: 8 red, 6 blue; 6 blue, 6 red, 2 green; 5 blue, 2 green, 3 red; 3 green, 3 blue; 4 green, 5 red, 1 blue
+Game 54: 4 blue, 1 red, 3 green; 4 green, 10 blue, 9 red; 7 red, 3 blue, 3 green; 9 green, 9 red, 1 blue; 9 blue, 6 red, 7 green; 6 blue, 7 green, 9 red
+Game 55: 15 red, 1 blue, 6 green; 11 blue, 3 red; 9 blue, 3 red, 1 green
+Game 56: 8 green, 8 red, 9 blue; 8 red, 8 green, 1 blue; 7 red, 10 green, 4 blue; 10 blue, 2 green, 9 red
+Game 57: 10 red, 3 green, 2 blue; 1 red, 4 green; 7 red, 1 green, 3 blue; 12 red, 4 blue; 14 red, 5 green, 4 blue
+Game 58: 8 green, 3 blue, 7 red; 7 red, 14 blue, 5 green; 3 green, 7 red; 16 blue, 15 green; 1 red, 10 blue
+Game 59: 3 red, 13 green, 2 blue; 10 blue, 3 green, 6 red; 3 green, 2 blue; 7 green, 2 blue, 7 red; 17 green, 6 blue, 15 red
+Game 60: 2 blue, 2 red, 6 green; 11 green, 1 blue, 2 red; 1 blue, 9 green; 1 red, 4 green, 2 blue; 1 red, 2 blue, 10 green
+Game 61: 3 red, 12 blue, 1 green; 3 red, 1 green, 18 blue; 5 blue, 2 red
+Game 62: 4 red, 3 blue, 8 green; 2 blue, 8 red, 9 green; 8 blue, 15 green, 1 red
+Game 63: 14 green, 2 red, 1 blue; 7 green, 11 blue, 1 red; 7 blue, 3 red; 4 green, 10 blue, 3 red
+Game 64: 8 blue, 18 green, 2 red; 3 red, 17 green; 7 green, 1 red, 12 blue; 15 green, 2 red, 4 blue; 7 green, 8 red, 13 blue
+Game 65: 6 blue, 5 green, 2 red; 1 red, 4 green; 5 green, 1 blue; 6 blue, 3 red, 2 green; 4 blue, 5 green
+Game 66: 11 red, 9 blue, 4 green; 8 red, 8 blue; 9 red, 7 blue; 1 blue, 12 green, 4 red; 2 red, 11 blue, 10 green
+Game 67: 1 red, 4 blue, 1 green; 7 red, 1 blue; 3 green, 4 blue, 6 red; 6 green, 3 blue, 14 red; 11 red, 1 blue, 1 green; 4 green, 8 red
+Game 68: 3 red, 1 green, 2 blue; 1 red, 9 blue; 2 red, 1 green
+Game 69: 3 green, 2 blue, 2 red; 1 red, 6 green; 13 red, 2 blue, 4 green; 4 blue, 13 red, 6 green; 12 red, 2 blue
+Game 70: 15 blue, 2 green, 7 red; 3 red, 14 blue; 6 blue, 1 green; 1 red, 2 green, 4 blue; 2 green, 13 red; 12 blue, 3 red
+Game 71: 7 red, 3 blue; 1 red, 4 blue; 2 red, 5 green, 1 blue; 6 blue, 8 red, 1 green; 3 green, 7 blue, 8 red
+Game 72: 7 green; 4 green, 2 red, 8 blue; 1 blue, 5 green
+Game 73: 5 red, 5 green, 2 blue; 8 red, 1 blue, 8 green; 1 red, 3 blue, 7 green
+Game 74: 17 green, 9 blue, 4 red; 20 green, 2 red, 7 blue; 7 blue, 2 green, 4 red; 2 blue, 5 red, 20 green; 1 blue, 1 red, 12 green; 19 green, 9 blue, 3 red
+Game 75: 1 red, 8 green, 9 blue; 7 blue, 3 green, 1 red; 2 green, 1 red, 9 blue; 5 blue, 1 red, 8 green; 2 green, 1 red, 11 blue; 5 green, 1 red
+Game 76: 3 blue, 16 green, 2 red; 10 green, 3 blue, 1 red; 6 blue, 14 red, 13 green; 7 red, 2 green, 13 blue
+Game 77: 7 red, 14 green; 1 blue, 1 red; 4 red, 1 green; 7 green, 11 red
+Game 78: 1 red, 19 green; 10 green, 14 red, 1 blue; 3 green, 3 blue, 11 red; 7 blue, 1 green; 15 red, 3 green, 4 blue
+Game 79: 7 red, 7 green, 6 blue; 3 red, 7 green, 5 blue; 7 red, 8 green, 12 blue
+Game 80: 15 red, 6 blue; 1 red, 5 green, 2 blue; 1 green, 3 blue
+Game 81: 3 red, 7 blue, 7 green; 7 green, 2 blue, 4 red; 3 green, 5 blue; 9 blue, 3 red, 6 green; 6 green, 1 red, 3 blue; 8 blue, 2 green, 1 red
+Game 82: 5 red, 13 green; 3 blue, 13 green; 6 blue, 4 red, 10 green; 5 red, 1 green, 4 blue; 1 blue, 8 red; 4 red, 5 green
+Game 83: 17 red, 1 blue, 2 green; 3 green, 3 red, 2 blue; 1 red, 5 blue, 10 green; 4 blue, 9 red, 11 green
+Game 84: 13 green, 14 red, 12 blue; 14 blue, 2 red, 1 green; 4 blue, 8 red
+Game 85: 3 red, 1 blue; 6 red, 3 blue, 2 green; 5 green, 3 blue, 3 red; 3 green, 5 blue, 1 red; 1 blue, 12 red, 2 green
+Game 86: 16 blue, 17 green, 7 red; 14 blue, 13 green; 18 blue, 8 green
+Game 87: 1 blue, 1 red; 4 blue, 1 green, 4 red; 1 green, 16 red; 1 green, 12 red, 1 blue
+Game 88: 1 red, 6 green; 3 red, 2 blue, 19 green; 11 green, 2 red; 5 blue, 5 green; 5 blue, 9 green, 1 red; 2 blue, 2 red, 4 green
+Game 89: 4 green, 11 red; 8 blue, 14 red; 14 blue, 8 green, 9 red; 14 green, 15 red, 10 blue
+Game 90: 8 green, 2 red, 1 blue; 11 green, 4 blue, 2 red; 7 green, 2 blue; 13 green, 1 red
+Game 91: 1 blue, 3 green; 1 blue; 4 green, 1 blue, 1 red; 1 blue, 2 red; 1 green, 2 red; 2 red, 5 green, 2 blue
+Game 92: 16 red, 4 green, 5 blue; 9 blue, 13 green, 5 red; 13 red, 11 green, 7 blue; 11 red, 8 green, 2 blue
+Game 93: 4 blue, 3 red, 3 green; 4 blue, 2 red, 1 green; 1 green, 2 red, 2 blue; 1 green, 2 red, 2 blue; 4 green, 1 blue
+Game 94: 8 blue, 11 red, 7 green; 8 red, 6 green; 15 blue, 11 green, 2 red; 9 green, 6 red; 16 blue, 5 red, 7 green
+Game 95: 13 blue, 1 red, 10 green; 11 green, 9 blue; 6 blue
+Game 96: 1 green, 6 red; 1 red; 12 red, 1 green; 6 red, 1 blue
+Game 97: 1 red, 9 blue, 8 green; 2 green, 6 blue, 1 red; 6 green, 1 blue
+Game 98: 9 blue, 7 green, 8 red; 6 red, 11 blue, 4 green; 11 green, 9 blue, 15 red; 11 red, 6 blue, 16 green
+Game 99: 2 blue, 1 red, 9 green; 8 red, 1 blue, 1 green; 2 red, 7 green, 8 blue; 1 red, 5 green, 7 blue; 7 blue, 10 green, 9 red; 1 green, 1 blue, 1 red
+Game 100: 3 blue, 6 red, 9 green; 4 red, 3 green; 4 green, 16 red, 1 blue; 14 blue, 1 green
diff --git a/2023/src/bin/day_2.rs b/2023/src/bin/day_2.rs
index b3a610b..6f19c1d 100644
--- a/2023/src/bin/day_2.rs
+++ b/2023/src/bin/day_2.rs
@@ -1,19 +1,109 @@
-use nom::IResult;
+use nom::{
+    bytes::complete::tag,
+    character::complete::{alpha1, line_ending, u32 as nom_u32},
+    combinator::map,
+    multi::separated_list1,
+    sequence::tuple,
+    IResult,
+};
 use std::fs;
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let input = fs::read_to_string("inputs/day_2.txt")?;
-    let parsed = Example::parser(&input).unwrap().1;
-    dbg!(&parsed);
+    let parsed = Games::parser(&input).unwrap().1;
+    let max_pull = Pull {
+        red: 12,
+        green: 13,
+        blue: 14,
+    };
+    dbg!(&parsed.valid_game_id_sum(&max_pull));
+    dbg!(&parsed.power_sum());
 
     Ok(())
 }
 
 #[derive(Debug)]
-struct Example;
+struct Games(Vec<Game>);
 
-impl Example {
-    fn parser(_input: &str) -> IResult<&str, Self> {
-        todo!()
+#[derive(Debug)]
+struct Game {
+    id: u32,
+    pulls: Vec<Pull>,
+}
+
+#[derive(Debug, Default)]
+struct Pull {
+    red: u32,
+    green: u32,
+    blue: u32,
+}
+
+impl Games {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        map(separated_list1(line_ending, Game::parser), Games)(input)
+    }
+
+    fn valid_game_id_sum(&self, max_pull: &Pull) -> u32 {
+        self.0
+            .iter()
+            .filter(|game| game.is_valid(max_pull))
+            .map(|game| game.id)
+            .sum()
+    }
+
+    fn power_sum(&self) -> u32 {
+        self.0.iter().map(|game| game.min_pull().power()).sum()
+    }
+}
+
+impl Game {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        map(
+            tuple((
+                tag("Game "),
+                nom_u32,
+                tag(": "),
+                separated_list1(tag("; "), Pull::parser),
+            )),
+            |(_, id, _, pulls)| Game { id, pulls },
+        )(input)
+    }
+
+    fn is_valid(&self, max_pull: &Pull) -> bool {
+        self.pulls.iter().all(|pull| {
+            pull.red <= max_pull.red && pull.blue <= max_pull.blue && pull.green <= max_pull.green
+        })
+    }
+
+    fn min_pull(&self) -> Pull {
+        Pull {
+            red: self.pulls.iter().map(|p| p.red).max().unwrap_or(0),
+            blue: self.pulls.iter().map(|p| p.blue).max().unwrap_or(0),
+            green: self.pulls.iter().map(|p| p.green).max().unwrap_or(0),
+        }
+    }
+}
+
+impl Pull {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        map(
+            separated_list1(tag(", "), tuple((nom_u32, tag(" "), alpha1))),
+            |stones| {
+                let mut pull = Pull::default();
+                for (quantity, _, colour) in stones {
+                    match colour {
+                        "red" => pull.red += quantity,
+                        "blue" => pull.blue += quantity,
+                        "green" => pull.green += quantity,
+                        other => panic!("Unexpected colour, {}", other),
+                    };
+                }
+                pull
+            },
+        )(input)
+    }
+
+    fn power(&self) -> u32 {
+        self.red * self.blue * self.green
     }
 }