Day 14 part 1.

src/day14.rs

@@ -0,0 +1,35 @@
+use aoc_runner_derive::{aoc, aoc_generator};
+
+#[aoc_generator(day14)]
+fn parse(input: &str) -> Vec<(usize, usize, usize)> {
+    input.lines()
+        .map(|line| {
+            // Rudolph can fly 22 km/s for 8 seconds, but then must rest for 165 seconds.
+            let parts: Vec<&str> = line.split(" ").collect();
+            let speed = parts[3].parse::<usize>().unwrap();
+            let fly = parts[6].parse::<usize>().unwrap();
+            let rest = parts[13].parse::<usize>().unwrap();
+            (speed, fly, rest)
+        })
+        .collect()
+}
+
+#[aoc(day14, part1)]
+fn part1(input: &Vec<(usize, usize, usize)>) -> usize {
+    let seconds = 2503;
+    input.into_iter()
+        .map(|&(speed, fly, rest)| {
+            let cycle = fly + rest;
+            let full = seconds / cycle;
+            let rem = seconds % cycle;
+            let partial = if rem < fly { rem } else { fly };
+            (full * fly + partial) * speed
+        })
+        .max()
+        .unwrap()
+}
+
+// #[aoc(day14, part2)]
+// fn part2(input: &str) -> String {
+//     todo!()
+// }

src/lib.rs

@@ -6,5 +6,6 @@ mod day10;
 mod day11;
 mod day12;
 mod day13;
+mod day14;
 
 aoc_lib! { year = 2015 }