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fn main() {
let input = lib::read_input(2);
part1(&input);
part2(&input);
}
fn part1(input: &str) {
let mut score = 0;
for line in input.split("\n") {
let mut split = line.split(" ").flat_map(|s| s.chars().next());
let Some(opp) = split.next() else { continue };
let me = split.next().unwrap();
let outcome_score = match (opp, me) {
('A', 'Z') | ('B', 'X') | ('C', 'Y') => 0,
('A', 'X') | ('B', 'Y') | ('C', 'Z') => 3,
('A', 'Y') | ('B', 'Z') | ('C', 'X') => 6,
_ => unreachable!(),
};
let choice_score = match me {
'X' => 1,
'Y' => 2,
'Z' => 3,
_ => unreachable!(),
};
score += outcome_score + choice_score;
}
println!("{}", score);
}
fn part2(input: &str) {
let mut score = 0;
for line in input.split("\n") {
let mut split = line.split(" ").flat_map(|s| s.chars().next());
let Some(opp) = split.next() else { continue };
let outcome = split.next().unwrap();
let opp = match opp {
'A' => 0,
'B' => 1,
'C' => 2,
_ => unreachable!(),
};
let (me, outcome_score) = match outcome {
'X' => ((opp - 1 + 3) % 3, 0),
'Y' => (opp, 3),
'Z' => ((opp + 1 + 3) % 3, 6),
_ => unreachable!(),
};
let choice_score = me + 1;
score += outcome_score + choice_score;
}
println!("{}", score);
}
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