Add rust version of day02

rust-rewrite/day02/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day02"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

rust-rewrite/day02/src/main.rs

@@ -0,0 +1,54 @@
+use std::fs;
+
+fn main() {
+    let file = fs::read_to_string("day02.in").unwrap();
+    println!("=== PART 1 ===");
+    part1(&file);
+    println!("=== PART 2 ===");
+    part2(&file);
+}
+
+fn part1(file: &String) {
+    let mut pos = vec![0, 0];
+
+    let direction_key = |x| match x {
+        "forward" => (1, 0),
+        "down" => (0, 1),
+        "up" => (0, -1),
+        _ => (0, 0),
+    };
+
+    for line in file
+        .strip_suffix("\n")
+        .unwrap()
+        .split('\n')
+        .map(|x| x.split(" ").collect::<Vec<&str>>())
+    {
+        pos[0] += direction_key(line[0]).0 * i32::from_str_radix(line[1], 10).unwrap();
+        pos[1] += direction_key(line[0]).1 * i32::from_str_radix(line[1], 10).unwrap();
+    }
+    println!("Current position: {:?}", pos);
+    println!("Product: {:?}", pos.iter().product::<i32>());
+}
+
+fn part2(file: &String) {
+    let mut pos = vec![0, 0, 0];
+
+    for line in file
+        .strip_suffix("\n")
+        .unwrap()
+        .split('\n')
+        .map(|x| x.split(" ").collect::<Vec<&str>>())
+    {
+        if line[0] == "down" {
+            pos[2] += i32::from_str_radix(line[1], 10).unwrap();
+        } else if line[0] == "up" {
+            pos[2] -= i32::from_str_radix(line[1], 10).unwrap();
+        } else if line[0] == "forward" {
+            pos[0] += i32::from_str_radix(line[1], 10).unwrap();
+            pos[1] += pos[2] * i32::from_str_radix(line[1], 10).unwrap();
+        }
+    }
+    println!("Current position: {:?}", pos);
+    println!("Product: {:?}", pos[0] * pos[1]);
+}