Day 2 working

src/bin/day2.rs

@@ -0,0 +1,44 @@
+use std::error::Error;
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::vec::Vec;
+
+fn to_moves(line: String) -> (i32, i32) {
+    let mut parts = line.split(" ");
+    let dir = parts.nth(0).unwrap();
+    let arg: i32 = parts.nth(0).unwrap().parse().unwrap();
+
+    match dir {
+        "up" => (0, -arg),
+        "down" => (0, arg),
+        "forward" => (arg, 0),
+        _ => panic!("Unsupported Direction: {}", dir),
+    }
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let file = File::open("inputs/day2.txt")?;
+    let lines = io::BufReader::new(file).lines().map(|l| l.unwrap());
+
+    let moves: Vec<(i32, i32)> = lines.map(|l| to_moves(l)).collect();
+    let pos = moves
+        .iter()
+        .fold((0, 0), |(ax, ay), (bx, by)| (ax + bx, ay + by));
+
+    println!("Answer1: {}", pos.0 * pos.1);
+
+    let mut aim = 0;
+    let mut pos = (0, 0);
+    for m in moves.iter() {
+        aim = aim + m.1;
+        println!("{} {}", m.0, m.1);
+
+            pos = (pos.0 + m.0, pos.1 + m.0 * aim);
+            println!("{} {}", pos.0, pos.1);
+        
+    }
+
+    println!("Answer2: {}", pos.0 * pos.1);
+
+    Ok(())
+}