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57767cb6c2
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eafd2387bb
132
src/day02.rs
132
src/day02.rs
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use std::str::FromStr;
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use aoc_runner_derive::{aoc, aoc_generator};
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#[derive(Copy, Clone, Debug)]
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pub struct InvalidMove;
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub enum Move {
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Rock,
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Paper,
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Scissors,
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}
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impl Move {
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fn shape_score(self) -> u64 {
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match self {
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Self::Rock => 1,
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Self::Paper => 2,
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Self::Scissors => 3,
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}
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}
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fn round_score(self, opp: Self) -> u64 {
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if self == opp {
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return 3;
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}
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match (self, opp) {
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(Self::Rock, Self::Scissors) => 6,
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(Self::Scissors, Self::Paper) => 6,
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(Self::Paper, Self::Rock) => 6,
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_ => 0,
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}
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}
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}
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impl FromStr for Move {
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type Err = InvalidMove;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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// X Y and Z are treated as moves because part 1 uses them as moves even though they are
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// not.
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match s {
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"A" | "X" => Ok(Self::Rock),
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"B" | "Y" => Ok(Self::Paper),
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"C" | "Z" => Ok(Self::Scissors),
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_ => Err(InvalidMove),
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}
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}
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}
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub enum Outcome {
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Lose,
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Draw,
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Win,
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}
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impl Outcome {
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fn compute_move(&self, opp: Move) -> Move {
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match self {
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Outcome::Lose => match opp {
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Move::Rock => Move::Scissors,
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Move::Paper => Move::Rock,
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Move::Scissors => Move::Paper,
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},
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Outcome::Draw => opp,
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Outcome::Win => match opp {
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Move::Rock => Move::Paper,
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Move::Paper => Move::Scissors,
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Move::Scissors => Move::Rock,
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},
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}
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}
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}
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#[derive(Copy, Clone, Debug)]
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pub struct InvalidOutcome;
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impl FromStr for Outcome {
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type Err = InvalidOutcome;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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match s {
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"X" => Ok(Self::Lose),
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"Y" => Ok(Self::Draw),
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"Z" => Ok(Self::Win),
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_ => Err(InvalidOutcome),
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}
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}
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}
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#[aoc_generator(day2, part1)]
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pub fn input_generator_part1(input: &str) -> Vec<(Move, Move)> {
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input
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.lines()
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.map(|line| {
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let (opp, you) = line.split_once(' ').unwrap();
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(opp.parse().unwrap(), you.parse().unwrap())
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})
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.collect::<Vec<_>>()
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}
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#[aoc(day2, part1)]
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pub fn solve_part1(input: &[(Move, Move)]) -> u64 {
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input
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.iter()
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.map(|&(opp, you)| you.shape_score() + you.round_score(opp))
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.sum()
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}
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#[aoc_generator(day2, part2)]
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pub fn input_generator_part2(input: &str) -> Vec<(Move, Outcome)> {
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input
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.lines()
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.map(|line| {
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let (opp, outcome) = line.split_once(' ').unwrap();
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(opp.parse().unwrap(), outcome.parse().unwrap())
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})
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.collect::<Vec<_>>()
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}
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#[aoc(day2, part2)]
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pub fn solve_part2(input: &[(Move, Outcome)]) -> u64 {
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input
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.iter()
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.map(|&(opp, outcome)| {
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let you = outcome.compute_move(opp);
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you.shape_score() + you.round_score(opp)
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})
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.sum()
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}
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@ -1,6 +1,5 @@
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use aoc_runner_derive::aoc_lib;
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pub mod day01;
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pub mod day02;
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aoc_lib! { year = 2022 }
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