Day 1 in Rust

1 files changed, 56 insertions, 0 deletions

diff --git a/src/bin/day01.rs b/src/bin/day01.rs
index f79c691..ed2d845 100644
--- a/src/bin/day01.rs
+++ b/src/bin/day01.rs
@@ -1,2 +1,58 @@
+use std::io::{self, Read};
+use std::ops::{Add, Mul};
+
+#[derive(Clone, Copy)]
+struct Point(i32, i32);
+
+impl Point {
+    fn left(self) -> Self {
+        Point(self.1, -self.0)
+    }
+
+    fn right(self) -> Self {
+        Point(-self.1, self.0)
+    }
+
+    fn distance(self, other: Self) -> i32 {
+        (self.0 - other.0).abs() + (self.1 - other.1).abs()
+    }
+}
+
+impl Add for Point {
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self {
+        Point(self.0 + rhs.0, self.1 + rhs.1)
+    }
+}
+
+impl Mul<i32> for Point {
+    type Output = Self;
+
+    fn mul(self, rhs: i32) -> Self {
+        Point(self.0 * rhs, self.1 * rhs)
+    }
+}
+
 fn main() {
+    let mut input = String::new();
+    io::stdin().read_to_string(&mut input).unwrap();
+
+    let mut position = Point(0, 0);
+    let mut direction = Point(0, -1);
+
+    for instruction in input.trim().split(", ") {
+        let (turn, count) = instruction.split_at(1);
+
+        if turn == "L" {
+            direction = direction.left();
+        } else {
+            direction = direction.right();
+        }
+
+        let count: i32 = count.parse().unwrap();
+        position = position + direction * count;
+    }
+
+    println!("Part 1: {}", position.distance(Point(0, 0)));
 }