add day 14

day14/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "day14"
+version = "0.1.0"

day14/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "day14"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

day14/input.txt

@@ -0,0 +1,9 @@
+Dancer can fly 27 km/s for 5 seconds, but then must rest for 132 seconds.
+Cupid can fly 22 km/s for 2 seconds, but then must rest for 41 seconds.
+Rudolph can fly 11 km/s for 5 seconds, but then must rest for 48 seconds.
+Donner can fly 28 km/s for 5 seconds, but then must rest for 134 seconds.
+Dasher can fly 4 km/s for 16 seconds, but then must rest for 55 seconds.
+Blitzen can fly 14 km/s for 3 seconds, but then must rest for 38 seconds.
+Prancer can fly 3 km/s for 21 seconds, but then must rest for 40 seconds.
+Comet can fly 18 km/s for 6 seconds, but then must rest for 103 seconds.
+Vixen can fly 18 km/s for 5 seconds, but then must rest for 84 seconds.

day14/src/main.rs

@@ -0,0 +1,144 @@
+use crate::State::{Flying, Resting};
+
+fn main() {
+    let data: Vec<_> = std::fs::read_to_string("input.txt")
+        .unwrap()
+        .lines()
+        .map(Reindeer::parse)
+        .collect();
+
+    part1(&data);
+    part2(&data);
+}
+
+fn part2(data: &[Reindeer]) {
+    let mut race = Race::new(data.to_vec());
+
+    while race.clock != 2503 {
+        race.tick();
+    }
+
+    let result = race
+        .participants
+        .iter()
+        .map(|p| p.reindeer.points)
+        .max()
+        .unwrap();
+    println!("{result}");
+}
+
+fn part1(data: &[Reindeer]) {
+    let mut race = Race::new(data.to_vec());
+
+    while race.clock != 1000 {
+        race.tick();
+    }
+
+    let result = race
+        .participants
+        .iter()
+        .map(|p| p.reindeer.distance_travelled)
+        .max()
+        .unwrap();
+    println!("{result}");
+}
+
+#[derive(Debug)]
+struct Race {
+    pub participants: Vec<Participant>,
+    pub clock: usize,
+}
+
+impl Race {
+    fn new(r: Vec<Reindeer>) -> Self {
+        let participants = r.into_iter().map(Participant::new).collect();
+
+        Self {
+            participants,
+            clock: 0,
+        }
+    }
+
+    fn tick(&mut self) {
+        self.clock += 1;
+        for p in &mut self.participants {
+            if p.state == Flying {
+                p.reindeer.distance_travelled += p.reindeer.speed;
+                p.current_activity_time += 1;
+                if p.current_activity_time == p.reindeer.fly_time {
+                    p.current_activity_time = 0;
+                    p.state = Resting;
+                }
+            } else {
+                p.current_activity_time += 1;
+                if p.current_activity_time == p.reindeer.rest_time {
+                    p.state = Flying;
+                    p.current_activity_time = 0;
+                }
+            }
+        }
+        let max_distance = self
+            .participants
+            .iter()
+            .map(|p| p.reindeer.distance_travelled)
+            .max()
+            .unwrap();
+        for p in &mut self.participants {
+            if p.reindeer.distance_travelled == max_distance {
+                p.reindeer.points += 1;
+            }
+        }
+    }
+}
+
+#[derive(Debug)]
+struct Participant {
+    pub reindeer: Reindeer,
+    pub state: State,
+    pub current_activity_time: usize,
+}
+
+impl Participant {
+    fn new(r: Reindeer) -> Self {
+        Self {
+            reindeer: r,
+            state: State::Flying,
+            current_activity_time: 0,
+        }
+    }
+}
+
+#[derive(Debug, PartialEq)]
+enum State {
+    Flying,
+    Resting,
+}
+
+#[derive(Debug, Clone)]
+struct Reindeer {
+    pub speed: usize,
+    pub fly_time: usize,
+    pub rest_time: usize,
+    pub distance_travelled: usize,
+    pub points: usize,
+}
+
+impl Reindeer {
+    fn parse(s: &str) -> Self {
+        let mut iter = s.split_whitespace();
+
+        let speed = iter.nth(3).unwrap().parse().unwrap();
+        let fly_time = iter.nth(2).unwrap().parse().unwrap();
+        let rest_time = iter.nth_back(1).unwrap().parse().unwrap();
+        let distance_travelled = 0;
+        let points = 0;
+
+        Self {
+            speed,
+            fly_time,
+            rest_time,
+            distance_travelled,
+            points,
+        }
+    }
+}