Advent 2023 Day 2

advent_of_code_2023/day2/main2.rs

@@ -0,0 +1,65 @@
+use std::cmp::max;
+use std::fs::read_to_string;
+
+struct Game {
+    index: i32,
+    red: i32,
+    blue: i32,
+    green: i32
+}
+
+impl Game {
+
+    fn new() -> Game {
+        Game{index: 0, red: 0, blue: 0, green: 0}
+    }
+
+    fn parse(line: &str) -> Game {
+        let mut game = Game::new();
+        let caret = game.parse_game_number(line) + 2; // skip : and ' '
+
+        for grab in line[caret..].split(';') {
+            game.parse_grab(grab.trim());
+        }
+
+        game
+    }
+
+    fn parse_game_number(&mut self, line: &str) -> usize {
+        let space = line.find(' ').unwrap() + 1;
+        let colon = line.find(':').unwrap();
+        self.index = line[space..colon].parse::<i32>().unwrap();
+        colon
+    }
+
+    fn parse_grab(&mut self, line: &str) {
+        for marbles in line.split(", ") {
+            self.parse_marbles(marbles);
+        }
+    }
+
+    fn parse_marbles(&mut self, line: &str) {
+        let mut parts = line.split(' ');
+        let number = parts.next().unwrap().parse::<i32>().unwrap();
+        let color = parts.next().unwrap();
+
+        match color {
+            "red" => self.red = max(self.red, number),
+            "green" => self.green = max(self.green, number),
+            "blue" => self.blue = max(self.blue, number),
+            _ => panic!("dafuq")
+        };
+    }
+
+}
+
+fn main() {
+    let mut power = 0;
+
+    for line in read_to_string("input.txt").unwrap().lines() {
+        let game = Game::parse(line);
+        power += game.red * game.green * game.blue;
+    }
+
+    println!("power: {}", power);
+}