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use std::collections::VecDeque; | |
#[derive(Clone, Copy, Debug, Eq, PartialEq)] | |
enum State { A, B, C, D, E, F } | |
// enum State { A, B } | |
const ITERATIONS: usize = 12_459_852; | |
// const ITERATIONS: usize = 6; | |
fn main() { | |
let mut tape = VecDeque::new(); | |
tape.push_back(false); | |
let mut cursor = 0; | |
let mut state = State::A; | |
for _ in 0..ITERATIONS { | |
// println!("({}, {:?}): {:?}", cursor, state, tape); | |
// sample | |
/* | |
let (new_val, cursor_change, new_state) = match (state, tape[cursor]) { | |
(State::A, false) => (true, 1, State::B), | |
(State::A, true) => (false, -1, State::B), | |
(State::B, false) => (true, -1, State::A), | |
(State::B, true) => (true, 1, State::A), | |
}; | |
*/ | |
let (new_val, cursor_change, new_state) = match (state, tape[cursor]) { | |
(State::A, false) => (true, 1, State::B), | |
(State::A, true) => (true, -1, State::E), | |
(State::B, false) => (true, 1, State::C), | |
(State::B, true) => (true, 1, State::F), | |
(State::C, false) => (true, -1, State::D), | |
(State::C, true) => (false, 1, State::B), | |
(State::D, false) => (true, 1, State::E), | |
(State::D, true) => (false, -1, State::C), | |
(State::E, false) => (true, -1, State::A), | |
(State::E, true) => (false, 1, State::D), | |
(State::F, false) => (true, 1, State::A), | |
(State::F, true) => (true, 1, State::C), | |
}; | |
state = new_state; | |
tape[cursor] = new_val; | |
if cursor == 0 && cursor_change == -1 { | |
tape.push_front(false); | |
} else { | |
cursor = (cursor as isize + cursor_change) as usize; | |
} | |
if cursor == tape.len() { | |
tape.push_back(false); | |
} | |
} | |
let checksum = tape.iter().filter(|&&b| b).count(); | |
println!("{}", checksum); | |
} |
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