day2

src/day2.rs

@@ -1,4 +1,5 @@
 // use itertools::Itertools;
+use std::cmp;
 use std::fs;
 
 pub fn run() {
@@ -6,9 +7,10 @@ pub fn run() {
     let input = fs::read_to_string("./inputs/day2.txt").expect("Could not read file");
 
     println!("\tPart 1: {}", part1(&input));
-    // println!("\tPart 2: {}", part2(&input));
+    println!("\tPart 2: {}", part2(&input));
 }
 
+#[derive(Debug)]
 struct Game {
     red: usize,
     green: usize,
@@ -66,7 +68,35 @@ fn part1(games: &str) -> usize {
     valid_games.into_iter().sum()
 }
 
-// fn part2(calibration_input: &str) -> usize {}
+fn part2(games: &str) -> usize {
+    let mut game_powers: Vec<usize> = vec![];
+    for game in games.lines() {
+        let (_, rounds) = game.split_once(':').unwrap();
+
+        let mut game_minimums = Game {
+            red: 0,
+            green: 0,
+            blue: 0,
+        };
+        for round in rounds.split(';') {
+            let dice = round.split(',');
+            for die in dice {
+                let (amount_str, color) = die.trim_start().split_once(' ').unwrap();
+                let amount = amount_str.parse::<usize>().unwrap();
+
+                match color {
+                    "red" => game_minimums.red = cmp::max(game_minimums.red, amount),
+                    "green" => game_minimums.green = cmp::max(game_minimums.green, amount),
+                    "blue" => game_minimums.blue = cmp::max(game_minimums.blue, amount),
+                    _ => panic!("No color match found"),
+                }
+            }
+        }
+
+        game_powers.push(game_minimums.red * game_minimums.green * game_minimums.blue);
+    }
+    game_powers.into_iter().sum()
+}
 
 #[cfg(test)]
 mod tests {
@@ -83,16 +113,14 @@ Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green";
         assert_eq!(part1(input), 8);
     }
 
-    //     #[test]
-    //     fn test_2() {
-    //         let input = "two1nine
-    // eightwothree
-    // abcone2threexyz
-    // xtwone3four
-    // 4nineeightseven2
-    // zoneight234
-    // 7pqrstsixteen";
+    #[test]
+    fn test_2() {
+        let input = "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";
 
-    //         assert_eq!(part2(input), 281);
-    //     }
+        assert_eq!(part2(input), 2286);
+    }
 }