[rs] Solve 2022_10 part 1

rs/src/y2022/d10.rs

@@ -0,0 +1,47 @@
+#[derive(Clone, Copy)]
+struct State {
+    x: i32,
+}
+
+struct Run {
+    history: Vec<State>,
+    now: State,
+}
+
+impl Run {
+    fn new() -> Self {
+        Self {
+            history: vec![],
+            now: State { x: 1 },
+        }
+    }
+
+    fn noop(&mut self) {
+        self.history.push(self.now);
+    }
+
+    fn addx(&mut self, arg: i32) {
+        self.noop();
+        self.noop();
+        self.now.x += arg;
+    }
+}
+
+pub fn solve(input: String) {
+    let mut run = Run::new();
+    for line in input.lines() {
+        if line == "noop" {
+            run.noop();
+        } else if let Some(arg) = line.strip_prefix("addx ") {
+            run.addx(arg.parse().unwrap());
+        } else {
+            panic!("Unknown instruction");
+        }
+    }
+
+    let part1 = [20, 60, 100, 140, 180, 220]
+        .into_iter()
+        .map(|i| run.history[i - 1].x * i as i32)
+        .sum::<i32>();
+    println!("Part 1: {part1}");
+}