solution: day2

src/bin/02.rs

@@ -0,0 +1,55 @@
+pub fn part_one(input: &str) -> Option<u32> {
+    let present_dimensions: Vec<Vec<u32>> = input
+        .trim()
+        .split('\n')
+        .map(|x| x.split('x').map(|y| y.parse::<u32>().unwrap()).collect())
+        .collect();
+
+    let mut wrapping = 0;
+    for present in present_dimensions.iter() {
+        if let [x, y, z] = &present[..] {
+            wrapping +=
+                2 * (x * y + y * z + z * x) + vec![x * y, y * z, z * x].iter().min().unwrap();
+        }
+    }
+    Some(wrapping)
+}
+pub fn part_two(input: &str) -> Option<u32> {
+    let present_dimensions: Vec<Vec<u32>> = input
+        .trim()
+        .split('\n')
+        .map(|x| x.split('x').map(|y| y.parse::<u32>().unwrap()).collect())
+        .collect();
+
+    let mut wrapping = 0;
+    for present in present_dimensions.iter() {
+        if let [x, y, z] = &present[..] {
+            // ribbon
+            wrapping += x * y * z;
+            // ribbon base
+            wrapping += 2 * (x + y + z - present.iter().max().unwrap());
+        }
+    }
+    Some(wrapping)
+}
+fn main() {
+    let input = &aoc::read_file("inputs", 2);
+    aoc::solve!(1, part_one, input);
+    aoc::solve!(2, part_two, input);
+}
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn test_part_one() {
+        // let input = aoc::read_file("test_inputs", 2);
+        let input = "2x3x4";
+        assert_eq!(part_one(&input), Some(58));
+    }
+    #[test]
+    fn test_part_two() {
+        // let input = aoc::read_file("test_inputs", 2);
+        let input = "2x3x4";
+        assert_eq!(part_two(&input), Some(34));
+    }
+}