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use std::collections::HashMap;
static DAY: u8 = 21;
fn main() {
let input = advent::read_lines(DAY);
println!("{DAY}a: {}", yelled_number(&input));
println!("{DAY}b: {}", 0);
}
#[derive(PartialEq,Eq,Hash)]
enum Job {
Yell { number: u64 },
Add { op1: String, op2: String },
Sub { op1: String, op2: String },
Mul { op1: String, op2: String },
Div { op1: String, op2: String },
}
impl Job {
fn new(input: &str) -> Job {
if let Some((op1, op2)) = input.split_once(" + ") {
Job::Add { op1: op1.to_string(), op2: op2.to_string() }
} else if let Some((op1, op2)) = input.split_once(" - ") {
Job::Sub { op1: op1.to_string(), op2: op2.to_string() }
} else if let Some((op1, op2)) = input.split_once(" * ") {
Job::Mul { op1: op1.to_string(), op2: op2.to_string() }
} else if let Some((op1, op2)) = input.split_once(" / ") {
Job::Div { op1: op1.to_string(), op2: op2.to_string() }
} else {
Job::Yell { number: input.parse().unwrap() }
}
}
}
#[derive(PartialEq,Eq,Hash)]
struct Monkey {
name: String,
job: Job,
}
impl Monkey {
fn new(input: &str) -> Monkey {
let (name, job) = input.split_once(": ").unwrap();
Monkey {
name: name.to_string(),
job: Job::new(job),
}
}
}
fn calculate_number(monkeys: &HashMap<String,Monkey>, name: &str) -> u64 {
let monkey = monkeys.get(name).expect("monkey should be in list");
match &monkey.job {
Job::Yell { number } => *number,
Job::Add { op1, op2 } => calculate_number(monkeys, &op1) + calculate_number(monkeys, &op2),
Job::Sub { op1, op2 } => calculate_number(monkeys, &op1) - calculate_number(monkeys, &op2),
Job::Mul { op1, op2 } => calculate_number(monkeys, &op1) * calculate_number(monkeys, &op2),
Job::Div { op1, op2 } => calculate_number(monkeys, &op1) / calculate_number(monkeys, &op2),
}
}
fn yelled_number(input: &[String]) -> u64 {
let monkeys = input.iter()
.map(|x| Monkey::new(x))
.map(|x| (x.name.clone(), x))
.collect::<HashMap<_,_>>();
calculate_number(&monkeys, "root")
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
let input = [
"root: pppw + sjmn",
"dbpl: 5",
"cczh: sllz + lgvd",
"zczc: 2",
"ptdq: humn - dvpt",
"dvpt: 3",
"lfqf: 4",
"humn: 5",
"ljgn: 2",
"sjmn: drzm * dbpl",
"sllz: 4",
"pppw: cczh / lfqf",
"lgvd: ljgn * ptdq",
"drzm: hmdt - zczc",
"hmdt: 32",
].iter().map(|&x| String::from(x)).collect::<Vec<_>>();
assert_eq!(yelled_number(&input), 152);
}
}
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