pt 1

day2/src/main.rs

@@ -0,0 +1,36 @@
+use std::fs;
+
+fn main() {
+    let input = fs::read_to_string("./input.txt").expect("Could not read file");
+
+    let commands: Vec<(&str, i32)> = input
+        .lines()
+        .map(|s| {
+            let mut split = s.split_whitespace();
+            (
+                split.next().unwrap(),
+                split.next().unwrap().parse::<i32>().unwrap(),
+            )
+        })
+        .collect();
+
+    part1(commands)
+}
+
+fn part1(commands: Vec<(&str, i32)>) {
+    let mut position = 0;
+    let mut depth = 0;
+
+    for (dir, amt) in commands.iter().map(|a| *a) {
+        let change = match dir {
+            "forward" => (amt, 0),
+            "up" => (0, -amt),
+            "down" => (0, amt),
+            _ => (0, 0),
+        };
+
+        position += change.0;
+        depth += change.1;
+    }
+    println!("Part 1: {}", position * depth);
+}