Day 6 part 1 and 2

README.md

@@ -18,13 +18,14 @@ You can find the puzzle inputs for each day on the Advent of Code website, or yo
 
 | Day | Part 1 | Part 2 |
 | :---: | :---: | :---:  |
-| [Day 1](./src/bin/01.rs) | `179.7µs` | `580.0µs` |
-| [Day 2](./src/bin/02.rs) | `72.7µs` | `72.7µs` |
-| [Day 3](./src/bin/03.rs) | `617.6µs` | `646.2µs` |
-| [Day 4](./src/bin/04.rs) | `186.6µs` | `185.5µs` |
-| [Day 5](./src/bin/05.rs) | `22.7µs` | `2.0s` |
-
-**Total: 2002.56ms**
+| [Day 1](./src/bin/01.rs) | `179.2µs` | `580.4µs` |
+| [Day 2](./src/bin/02.rs) | `73.7µs` | `73.2µs` |
+| [Day 3](./src/bin/03.rs) | `614.0µs` | `644.0µs` |
+| [Day 4](./src/bin/04.rs) | `185.0µs` | `186.2µs` |
+| [Day 5](./src/bin/05.rs) | `22.9µs` | `2.0s` |
+| [Day 6](./src/bin/06.rs) | `403.0ns` | `17.7ms` |
+
+**Total: 2020.26ms**
 <!--- benchmarking table --->
 
 ---

src/bin/06.rs

@@ -0,0 +1,68 @@
+use itertools::{multizip, Itertools};
+
+advent_of_code::solution!(6);
+
+pub fn part_one(input: &str) -> Option<usize> {
+    // Parse input into tuples of (time, speed) in usize based on
+    // Time:      7  15   30
+    // Distance:  9  40  200
+    let mut times_distances = input
+        .lines()
+        .map(|s| s.split_whitespace().filter_map(|s| s.parse::<usize>().ok()));
+
+    let times = times_distances.next().unwrap();
+    let distances = times_distances.next().unwrap();
+    let rounds = times.zip(distances);
+
+    let score = rounds
+        .map(|(time, record_distance)| {
+            (0..time)
+                .map(|press| {
+                    let remaining = time - press;
+                    let distance = press * remaining;
+                    distance
+                })
+                .filter(|&distance| distance > record_distance)
+                .count()
+        })
+        .reduce(|a, b| a * b);
+
+    score
+}
+
+pub fn part_two(input: &str) -> Option<usize> {
+    let [time, speed]: [usize; 2] = input
+        .lines()
+        .map(|s| s.chars().filter(|c| c.is_numeric()).collect::<String>())
+        .filter_map(|s| s.parse::<usize>().ok())
+        .collect_vec()
+        .try_into()
+        .unwrap();
+
+    (0..time)
+        .map(|press| {
+            let remaining = time - press;
+            let distance = press * remaining;
+            distance
+        })
+        .filter(|&distance| distance > speed)
+        .count()
+        .into()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part_one() {
+        let result = part_one(&advent_of_code::template::read_file("examples", DAY));
+        assert_eq!(result, Some(288));
+    }
+
+    #[test]
+    fn test_part_two() {
+        let result = part_two(&advent_of_code::template::read_file("examples", DAY));
+        assert_eq!(result, Some(71503));
+    }
+}