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adventofcode
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day02: Add part 2 

I suspect there must be a better way which could present this more
generically e.g. if I could iterate over the enum somehow ...
This commit is contained in:
MasterofJOKers 2022-12-15 18:03:37 +01:00
parent 1001e9dd0f
commit 7b82a1f46b
1 changed files with 54 additions and 21 deletions
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75
day02/src/main.rs
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@ -17,9 +17,6 @@ impl Values {
"A" => Values::Rock, "A" => Values::Rock,
"B" => Values::Paper, "B" => Values::Paper,
"C" => Values::Scissors, "C" => Values::Scissors,
"X" => Values::Rock,
"Y" => Values::Paper,
"Z" => Values::Scissors,
_ => panic!("Unexpected value for Values") _ => panic!("Unexpected value for Values")
} }
} }
@ -28,23 +25,61 @@ impl Values {
match self { match self {
Values::Rock => 1, Values::Rock => 1,
Values::Paper => 2, Values::Paper => 2,
Values::Scissors => 3 Values::Scissors => 3,
} }
} }
fn beats(self, other: Values) -> bool { fn get_other(&self, play_result: &PlayResult) -> Values {
if self == Values::Rock { match self {
other == Values::Scissors Values::Rock => {
} else if self == Values::Paper { match play_result {
other == Values::Rock PlayResult::Lose => Values::Scissors,
} else if self == Values::Scissors { PlayResult::Draw => Values::Rock,
other == Values::Paper PlayResult::Win => Values::Paper
} else { }
false },
Values::Paper => {
match play_result {
PlayResult::Lose => Values::Rock,
PlayResult::Draw => Values::Paper,
PlayResult::Win => Values::Scissors
}
},
Values::Scissors => {
match play_result {
PlayResult::Lose => Values::Paper,
PlayResult::Draw => Values::Scissors,
PlayResult::Win => Values::Rock,
}
},
} }
} }
} }
enum PlayResult {
Lose,
Draw,
Win,
}
impl PlayResult {
fn get_from_str(v: &str) -> PlayResult {
match v {
"X" => PlayResult::Lose,
"Y" => PlayResult::Draw,
"Z" => PlayResult::Win,
_ => panic!("Unexpected value for PlayResult")
}
}
fn get_u32(&self) -> u32 {
match self {
PlayResult::Lose => 0,
PlayResult::Draw => 3,
PlayResult::Win => 6
}
}
}
fn main() -> Result<(), Box<dyn error::Error>> { fn main() -> Result<(), Box<dyn error::Error>> {
let f = File::open("input.txt")?; let f = File::open("input.txt")?;
@ -53,15 +88,13 @@ fn main() -> Result<(), Box<dyn error::Error>> {
let mut sum: u32 = 0; let mut sum: u32 = 0;
for line in reader.lines() { for line in reader.lines() {
let line = line?; let line = line?;
let mut split_result = line.split_whitespace().map(|o| Values::get_from_str(o)); let split_result = line.split_whitespace().collect::<Vec<&str>>();
let other = split_result.next().unwrap(); let other = Values::get_from_str(split_result[0]);
let my = split_result.next().unwrap(); let play_result = PlayResult::get_from_str(split_result[1]);
let my = other.get_other(&play_result);
sum += my.get_u32(); sum += my.get_u32();
if other == my { sum += play_result.get_u32();
sum += 3;
} else if my.beats(other) {
sum += 6;
}
} }
println!("{}", sum); println!("{}", sum);