finish day 2

src/day2.rs

@@ -0,0 +1,90 @@
+use std::cmp;
+use std::fs;
+
+pub fn run() {
+    println!("Day 2:");
+    let input = fs::read_to_string("./inputs/day2.txt").expect("Could not read file");
+
+    // let input = "1x1x10\n1x1x10".to_string();
+    let dimensions_list = input
+        .split_whitespace()
+        .map(|c| {
+            c.split('x')
+                .map(|n| n.parse::<usize>().unwrap())
+                .collect::<Vec<usize>>()
+        })
+        .collect::<Vec<Vec<usize>>>();
+
+    println!("\tPart 1: {}", part1(&dimensions_list));
+    println!("\tPart 2: {}", part2(&dimensions_list));
+}
+
+fn part1(dimensions: &Vec<Vec<usize>>) -> usize {
+    dimensions
+        .into_iter()
+        .map(|x| {
+            let (l, w, h) = (x[0], x[1], x[2]);
+            let slack = { cmp::min(l * w, cmp::min(w * h, l * h)) };
+            2 * l * w + 2 * w * h + 2 * h * l + slack
+        })
+        .sum::<usize>()
+}
+
+fn part2(dimensions: &Vec<Vec<usize>>) -> usize {
+    dimensions
+        .into_iter()
+        .map(|x| {
+            let (l, w, h) = (x[0], x[1], x[2]);
+            let volume = l * w * h;
+            let wrap = {
+                let mut y = x.clone();
+                y.sort();
+                2 * (y[0] + y[1])
+            };
+
+            volume + wrap
+        })
+        .sum::<usize>()
+}
+// fn part2(directions: &String) -> usize {
+//     let mut floor: isize = 0;
+
+//     for (num, dir) in directions.chars().enumerate() {
+//         floor += match dir {
+//             '(' => 1,
+//             ')' => -1,
+//             _ => 0,
+//         };
+
+//         if floor == -1 {
+//             return num + 1;
+//         }
+//     }
+
+//     return directions.len() + 1;
+// }
+
+// #[cfg(test)]
+// mod tests {
+//     use super::*;
+
+//     #[test]
+//     fn test_1() {
+//         let mut input: String;
+
+//         let input = "2x3x4";
+//         assert_eq!(part1(&input), 0);
+
+//         input = "()()".to_string();
+//         assert_eq!(part1(&input), 0);
+//     }
+
+//     // #[test]
+//     // fn test_2() {
+//     //     let mut input = ")".to_string();
+//     //     assert_eq!(part2(&input), 1);
+
+//     //     input = "()())".to_string();
+//     //     assert_eq!(part2(&input), 5);
+//     // }
+// }

src/main.rs

@@ -1,6 +1,8 @@
 mod day1;
+mod day2;
 
 fn main() {
     println!("Running Advent of Code 2021");
     day1::run();
+    day2::run();
 }