initial commit

1 files changed, 82 insertions, 0 deletions

diff --git a/2022/src/day10.rs b/2022/src/day10.rs
new file mode 100644
index 0000000..4c74444
--- /dev/null
+++ b/2022/src/day10.rs
@@ -0,0 +1,82 @@
+mod utils;
+use utils::{parse_num, parse_static, read_input};
+
+fn main() {
+    let input = read_input();
+
+    let mut cmds = input.lines().map(parse_cmd);
+    let mut state = State {
+        x: 1,
+        add_next: None,
+        add_next_start: None,
+        crt_pos: 0,
+    };
+
+    let mut acc = 0;
+    run_steps::<20>(&mut state, &mut cmds);
+    acc += state.x * 20;
+    for i in 1..=5 {
+        run_steps::<40>(&mut state, &mut cmds);
+        acc += state.x * (20 + (i * 40));
+    }
+
+    run_steps::<{ TOTAL_STEPS - 220 }>(&mut state, &mut cmds);
+
+    println!("Part 1: {}", acc);
+}
+
+struct State {
+    x: isize,
+    add_next: Option<isize>,
+    add_next_start: Option<isize>,
+    crt_pos: usize,
+}
+
+const CRT_WIDTH: usize = 40;
+const CRT_HEIGHT: usize = 6;
+const TOTAL_STEPS: usize = CRT_WIDTH * CRT_HEIGHT;
+
+fn run_steps<const N: usize>(state: &mut State, cmd: &mut impl Iterator<Item = Command>) {
+    for _ in 0..N {
+        if let Some(add) = state.add_next_start.take() {
+            state.x += add;
+        }
+
+        if (state.x - (state.crt_pos % CRT_WIDTH) as isize).abs() < 2 {
+            print!("█");
+        } else {
+            print!(" ");
+        }
+        state.crt_pos += 1;
+        if (state.crt_pos % CRT_WIDTH) == 0 {
+            println!();
+        }
+
+        if let Some(add) = state.add_next.take() {
+            state.add_next_start = Some(add);
+        } else {
+            match cmd.next() {
+                Some(Command::NoOp) => (),
+                Some(Command::AddX(add)) => state.add_next = Some(add),
+                None => (),
+            }
+        }
+    }
+}
+
+fn parse_cmd(cmd: &str) -> Command {
+    if cmd == "noop" {
+        Command::NoOp
+    } else {
+        let cmd = parse_static("addx ", cmd);
+        let (add, _) = parse_num(cmd);
+
+        Command::AddX(add)
+    }
+}
+
+#[derive(Debug)]
+enum Command {
+    NoOp,
+    AddX(isize),
+}