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2 changed files with 0 additions and 133 deletions

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use std::str::FromStr;
use aoc_runner_derive::{aoc, aoc_generator};
#[derive(Copy, Clone, Debug)]
pub struct InvalidMove;
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum Move {
Rock,
Paper,
Scissors,
}
impl Move {
fn shape_score(self) -> u64 {
match self {
Self::Rock => 1,
Self::Paper => 2,
Self::Scissors => 3,
}
}
fn round_score(self, opp: Self) -> u64 {
if self == opp {
return 3;
}
match (self, opp) {
(Self::Rock, Self::Scissors) => 6,
(Self::Scissors, Self::Paper) => 6,
(Self::Paper, Self::Rock) => 6,
_ => 0,
}
}
}
impl FromStr for Move {
type Err = InvalidMove;
fn from_str(s: &str) -> Result<Self, Self::Err> {
// X Y and Z are treated as moves because part 1 uses them as moves even though they are
// not.
match s {
"A" | "X" => Ok(Self::Rock),
"B" | "Y" => Ok(Self::Paper),
"C" | "Z" => Ok(Self::Scissors),
_ => Err(InvalidMove),
}
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum Outcome {
Lose,
Draw,
Win,
}
impl Outcome {
fn compute_move(&self, opp: Move) -> Move {
match self {
Outcome::Lose => match opp {
Move::Rock => Move::Scissors,
Move::Paper => Move::Rock,
Move::Scissors => Move::Paper,
},
Outcome::Draw => opp,
Outcome::Win => match opp {
Move::Rock => Move::Paper,
Move::Paper => Move::Scissors,
Move::Scissors => Move::Rock,
},
}
}
}
#[derive(Copy, Clone, Debug)]
pub struct InvalidOutcome;
impl FromStr for Outcome {
type Err = InvalidOutcome;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"X" => Ok(Self::Lose),
"Y" => Ok(Self::Draw),
"Z" => Ok(Self::Win),
_ => Err(InvalidOutcome),
}
}
}
#[aoc_generator(day2, part1)]
pub fn input_generator_part1(input: &str) -> Vec<(Move, Move)> {
input
.lines()
.map(|line| {
let (opp, you) = line.split_once(' ').unwrap();
(opp.parse().unwrap(), you.parse().unwrap())
})
.collect::<Vec<_>>()
}
#[aoc(day2, part1)]
pub fn solve_part1(input: &[(Move, Move)]) -> u64 {
input
.iter()
.map(|&(opp, you)| you.shape_score() + you.round_score(opp))
.sum()
}
#[aoc_generator(day2, part2)]
pub fn input_generator_part2(input: &str) -> Vec<(Move, Outcome)> {
input
.lines()
.map(|line| {
let (opp, outcome) = line.split_once(' ').unwrap();
(opp.parse().unwrap(), outcome.parse().unwrap())
})
.collect::<Vec<_>>()
}
#[aoc(day2, part2)]
pub fn solve_part2(input: &[(Move, Outcome)]) -> u64 {
input
.iter()
.map(|&(opp, outcome)| {
let you = outcome.compute_move(opp);
you.shape_score() + you.round_score(opp)
})
.sum()
}

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@ -1,6 +1,5 @@
use aoc_runner_derive::aoc_lib;
pub mod day01;
pub mod day02;
aoc_lib! { year = 2022 }