day5: part1

src/day5.rs

@@ -0,0 +1,75 @@
+use std::ops::RangeInclusive;
+
+use aoc_runner_derive::{aoc, aoc_generator};
+
+struct Database {
+    fresh_ingredients: Vec<RangeInclusive<u64>>,
+    available_ingredients: Vec<u64>,
+}
+
+#[aoc_generator(day5)]
+fn parse(input: &str) -> Database {
+    let mut fresh_ingredients = Vec::new();
+    let mut available_ingredients = Vec::new();
+    let mut parsing_ranges = true;
+    for line in input.lines() {
+        if line == "" {
+            parsing_ranges = false;
+            continue;
+        }
+        if parsing_ranges {
+            let (start, end) = line.split_once(|c| c == '-').unwrap();
+            fresh_ingredients.push(RangeInclusive::new(
+                start.parse().unwrap(),
+                end.parse().unwrap(),
+            ));
+        } else {
+            available_ingredients.push(line.parse().unwrap())
+        }
+    }
+    Database {
+        fresh_ingredients,
+        available_ingredients,
+    }
+}
+
+#[aoc(day5, part1)]
+fn part1(input: &Database) -> u64 {
+    input
+        .available_ingredients
+        .iter()
+        .filter(|i| input.fresh_ingredients.iter().any(|r| r.contains(i)))
+        .count() as u64
+}
+
+#[aoc(day5, part2)]
+fn part2(input: &Database) -> u64 {
+    0
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const EXAMPLE: &str = "3-5
+10-14
+16-20
+12-18
+
+1
+5
+8
+11
+17
+32";
+
+    #[test]
+    fn part1_example() {
+        assert_eq!(part1(&parse(EXAMPLE)), 3);
+    }
+
+    #[test]
+    fn part2_example() {
+        assert_eq!(part2(&parse(EXAMPLE)), 0);
+    }
+}