1 files changed, 65 insertions, 0 deletions
diff --git a/2022/rust/day10/src/main.rs b/2022/rust/day10/src/main.rs
new file mode 100644
index 0000000..89849ea
--- /dev/null
+++ b/2022/rust/day10/src/main.rs
@@ -0,0 +1,65 @@
+use std::env;
+use std::fs;
+
+#[derive(Eq, PartialEq)]
+enum Ins {
+    Noop,
+    Addr(i32)
+}
+
+fn main() {
+    let args = env::args().nth(1).expect("missing input");
+    let input = fs::read_to_string(args).unwrap();
+
+    let instructions: Vec<Ins> = input.trim().split("\n")
+        .map(|x| {
+            if x == "noop" {
+                return Ins::Noop;
+            } else {
+                let val = x.split_whitespace().nth(1).unwrap();
+                return Ins::Addr(val.parse::<i32>().unwrap());
+            }
+        }).collect();
+
+    let mut sum = 0;
+    let mut clock = 1;
+    let mut register = 1;
+
+    for ins in instructions {
+        render(&clock, &register);
+        tick(&mut clock);
+        compare(&clock, &register, &mut sum);
+        if let Ins::Addr(x) = ins {
+            render(&clock, &register);
+            tick(&mut clock);
+            write(&mut register, x);
+            compare(&clock, &register, &mut sum);
+        }
+    }
+    println!("{}", sum);
+}
+
+fn render(clock: &i32, register: &i32) {
+    if i32::abs(register - ((clock-1) % 40)) < 2 {
+        print!("#");
+    } else {
+        print!(".");
+    }
+    if clock % 40 == 0 {
+        print!("\n");
+    }
+}
+
+fn tick(clock: &mut i32) {
+    *clock += 1;
+}
+
+fn compare(clock: &i32, register: &i32, sum: &mut i32) {
+    if clock % 40 == 20 {
+        *sum += *register * *clock;
+    }
+}
+
+fn write(register: &mut i32, value: i32) {
+    *register += value;
+}