day 2

src/day02.rs

@@ -0,0 +1,37 @@
+fn parse_input(input: &str) -> Vec<(&str, i64)> {
+    input.lines().map(|l| l.split(" ").collect()).map ( |v: Vec<&str>| (v[0], v[1].parse::<i64>().expect("err parsing int"))).collect()
+}
+
+fn plot(input: Vec<(&str, i64)>) -> i64 {
+    input.iter().fold(vec![0,0], |acc: Vec<i64>, v| match v.0 {
+        "up" => vec!(acc[0] - v.1, acc[1]),
+        "down" => vec!(acc[0] + v.1, acc[1]),
+        "forward" => vec!(acc[0], acc[1] + v.1),
+        _ => {println!("unhandled dir {}", v.0); acc},
+        }).iter().product::<i64>()
+}
+
+fn plot_aim(input: Vec<(&str, i64)>) -> i64 {
+    let v = input.iter().fold(vec![0,0,0], |acc: Vec<i64>, v| match v.0 {
+        "up" => vec!(acc[0], acc[1], acc[2] - v.1),
+        "down" => vec!(acc[0], acc[1], acc[2] + v.1),
+        "forward" => vec!(acc[0] + v.1, acc[1] + (v.1 * acc[2]), acc[2]),
+        _ => {println!("unhandled dir {}", v.0); acc},
+    });
+    v[0] * v[1]
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn part_1(){
+        println!("Part 1 Solution: {}", plot(parse_input( include_str!("../input/day02.txt"))));
+    }
+
+    #[test]
+    fn part_2(){
+        println!("Part 2 Solution: {}", plot_aim(parse_input( include_str!("../input/day02.txt"))));
+    }
+}

src/lib.rs

@@ -1 +1,2 @@
-pub mod day01;
+pub mod day01;
+pub mod day02;