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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),
}
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