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[package]
name = "rust_2022_02"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]

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use core::fmt;
use std::{
io::{stdin, Read},
str::FromStr,
};
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
enum Rps {
Rock,
Paper,
Scissors,
}
impl Rps {
fn outcome_against(&self, other: Rps) -> Outcome {
match (self, other) {
(Rps::Rock, Rps::Scissors) | (Rps::Paper, Rps::Rock) | (Rps::Scissors, Rps::Paper) => {
Outcome::Win
}
(Rps::Rock, Rps::Rock) | (Rps::Paper, Rps::Paper) | (Rps::Scissors, Rps::Scissors) => {
Outcome::Draw
}
(Rps::Rock, Rps::Paper) | (Rps::Paper, Rps::Scissors) | (Rps::Scissors, Rps::Rock) => {
Outcome::Lose
}
}
}
fn score(&self) -> u64 {
match self {
Rps::Rock => 1,
Rps::Paper => 2,
Rps::Scissors => 3,
}
}
fn with_outcome(&self, outcome: Outcome) -> Rps {
match (self, outcome) {
(r, Outcome::Draw) => *r,
(Rps::Rock, Outcome::Lose) => Rps::Scissors,
(Rps::Paper, Outcome::Lose) => Rps::Rock,
(Rps::Scissors, Outcome::Lose) => Rps::Paper,
(Rps::Rock, Outcome::Win) => Rps::Paper,
(Rps::Paper, Outcome::Win) => Rps::Scissors,
(Rps::Scissors, Outcome::Win) => Rps::Rock,
}
}
}
impl FromStr for Rps {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"A" | "X" => Ok(Rps::Rock),
"B" | "Y" => Ok(Rps::Paper),
"C" | "Z" => Ok(Rps::Scissors),
_ => Err(()),
}
}
}
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
enum Outcome {
Lose,
Draw,
Win,
}
impl Outcome {
fn score(&self) -> u64 {
match self {
Outcome::Lose => 0,
Outcome::Draw => 3,
Outcome::Win => 6,
}
}
}
impl FromStr for Outcome {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"X" => Ok(Outcome::Lose),
"Y" => Ok(Outcome::Draw),
"Z" => Ok(Outcome::Win),
_ => Err(()),
}
}
}
fn get_score<F, Rhs>(s: &str, f: F) -> u64
where
F: Fn(Rps, Rhs) -> (Rps, Outcome),
Rhs: FromStr,
<Rhs as FromStr>::Err: fmt::Debug,
{
s.lines()
.map(|line| {
let mut parts = line.split_whitespace();
let other: Rps = parts.next().unwrap().parse().unwrap();
let rhs = parts.next().unwrap().parse().unwrap();
let (me, outcome) = f(other, rhs);
me.score() + outcome.score()
})
.sum()
}
fn main() {
let mut data = String::new();
stdin().read_to_string(&mut data).unwrap();
println!(
"{}",
get_score(&data, |other, me| (me, me.outcome_against(other)))
);
println!(
"{}",
get_score(&data, |other, outcome| (
other.with_outcome(outcome),
outcome
))
);
}

4
Cargo.lock generated
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@ -465,10 +465,6 @@ dependencies = [
name = "rust_2022_01"
version = "0.1.0"
[[package]]
name = "rust_2022_02"
version = "0.1.0"
[[package]]
name = "ryu"
version = "1.0.11"

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@ -10,5 +10,4 @@ members = [
"2021/day16/rust",
"2021/day22/rust",
"2022/day1/rust",
"2022/day2/rust",
]