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/// Rock : 1
/// Paper : 2
/// Scissors : 3
/// opponent
/// R P S
/// me A B C
/// _ L X 3 1 2
/// _ D Y 4 5 6
/// _ W Z 8 9 7
///
/// idx = 3 * op_idx + my_idx
const RPS_RESULTS: [usize; 9] = [3, 1, 2, 4, 5, 6, 8, 9, 7];
fn main() {
let score = include_str!("../../input").lines().fold(0, parse_line);
println!("{}", score);
}
fn parse_line(score: usize, line: &str) -> usize {
let mut moves = line.split(' ');
let opponent_move = moves.next().unwrap();
let my_move = moves.next().unwrap();
let my_idx = match opponent_move {
"A" => 0,
"B" => 1,
"C" => 2,
_ => unreachable!(),
};
let op_idx = match my_move {
"X" => 0,
"Y" => 1,
"Z" => 2,
_ => unreachable!(),
};
RPS_RESULTS[3 * op_idx + my_idx] + score
}
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