1 files changed, 88 insertions, 0 deletions
diff --git a/src/bin/2023/day6.rs b/src/bin/2023/day6.rs
new file mode 100644
index 0000000..209cfef
--- /dev/null
+++ b/src/bin/2023/day6.rs
@@ -0,0 +1,88 @@
+#![allow(dead_code)]
+#![allow(unused_variables)]
+
+use advent_of_code::prelude::*;
+
+#[derive(Debug)]
+pub struct Race {
+    time: i64,
+    distance: i64,
+}
+
+impl Race {
+    fn distance(&self, t: i64) -> i64 {
+        (self.time - t) * t
+    }
+}
+
+pub fn parse(fh: File) -> Result<Vec<Race>> {
+    let mut lines = parse::raw_lines(fh);
+    let time = lines.next().unwrap();
+    let distance = lines.next().unwrap();
+    let times: Vec<_> = time
+        .split(':')
+        .nth(1)
+        .unwrap()
+        .split_whitespace()
+        .map(|s| s.parse().unwrap())
+        .collect();
+    let distances: Vec<_> = distance
+        .split(':')
+        .nth(1)
+        .unwrap()
+        .split_whitespace()
+        .map(|s| s.parse().unwrap())
+        .collect();
+    Ok((0..times.len())
+        .map(|i| Race {
+            time: times[i],
+            distance: distances[i],
+        })
+        .collect())
+}
+
+pub fn part1(races: Vec<Race>) -> Result<i64> {
+    Ok(races
+        .into_iter()
+        .map(|race| -> i64 {
+            (0..race.time)
+                .map(|t| race.distance(t))
+                .filter(|d| *d > race.distance)
+                .count()
+                .try_into()
+                .unwrap()
+        })
+        .product())
+}
+
+pub fn part2(races: Vec<Race>) -> Result<i64> {
+    let mut real_race = Race {
+        time: 0,
+        distance: 0,
+    };
+    for race in races {
+        real_race.time =
+            real_race.time * 10i64.pow(race.time.ilog10() + 1) + race.time;
+        real_race.distance = real_race.distance
+            * 10i64.pow(race.distance.ilog10() + 1)
+            + race.distance;
+    }
+    Ok((0..real_race.time)
+        .map(|t| real_race.distance(t))
+        .filter(|d| *d > real_race.distance)
+        .count()
+        .try_into()
+        .unwrap())
+}
+
+#[test]
+fn test() {
+    assert_eq!(
+        part1(parse(parse::data(2023, 6).unwrap()).unwrap()).unwrap(),
+        861300
+    );
+    assert_eq!(
+        part2(parse(parse::data(2023, 6).unwrap()).unwrap()).unwrap(),
+        28101347
+    );
+}