Day 2

src/day2.rs

@@ -0,0 +1,53 @@
+pub fn day2() {
+    // let input = r#"
+    // forward 5
+    // down 5
+    // forward 8
+    // up 3
+    // down 8
+    // forward 2
+    //     "#;
+    let input = include_str!("../input/day2.txt");
+
+    let mut x = 0;
+    let mut d = 0;
+    for line in input.trim().lines() {
+        let parts: Vec<&str> = line.trim().split(' ').collect();
+        let amount: i32 = parts.get(1).unwrap().parse().unwrap();
+        match *parts.get(0).unwrap() {
+            "forward" => {
+                x += amount;
+            }
+            "down" => {
+                d += amount;
+            }
+            "up" => {
+                d -= amount;
+            }
+            _ => panic!(),
+        }
+    }
+    println!("{}", x * d);
+
+    x = 0;
+    d = 0;
+    let mut aim = 0;
+    for line in input.trim().lines() {
+        let parts: Vec<&str> = line.trim().split(' ').collect();
+        let amount: i32 = parts.get(1).unwrap().parse().unwrap();
+        match *parts.get(0).unwrap() {
+            "forward" => {
+                x += amount;
+                d += aim * amount;
+            }
+            "down" => {
+                aim += amount;
+            }
+            "up" => {
+                aim -= amount;
+            }
+            _ => panic!(),
+        }
+    }
+    println!("{}", x * d);
+}

src/main.rs

@@ -1,5 +1,8 @@
+#![allow(dead_code)]
+
 mod day1;
+mod day2;
 
 fn main() {
-    day1::day1();
+    day2::day2();
 }