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use std::{collections::VecDeque, str::FromStr, string::ParseError};
#[derive(Debug, Clone, Copy)]
enum Op {
Add(i64),
Prod(i64),
Square,
}
#[derive(Debug, Clone)]
struct Monkey {
starting_items: VecDeque<i64>,
inspected_items: i64,
operation: Op,
test: i64,
monkey_true: i64,
monkey_false: i64,
}
fn parse_items(line: &str) -> String {
line.chars().skip_while(|&ch| ch != ':').skip(2).collect()
}
fn get_last_token(line: &str) -> i64 {
line.split(" ")
.last()
.unwrap()
.parse::<i64>()
.expect("Should be parasble to i64")
}
impl FromStr for Monkey {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let lines: Vec<_> = s.lines().collect();
let items: VecDeque<i64> = parse_items(lines[1])
.split(", ")
.map(|x| x.parse::<i64>().expect("Should be parsable to i64"))
.collect();
let line_2: Vec<_> = lines[2].split(" ").collect();
let v: Vec<_> = line_2.iter().rev().take(2).collect();
let op = {
match *v[0] {
"old" => Op::Square,
_ => match *v[1] {
"+" => Op::Add(v[0].parse::<i64>().unwrap()),
"*" => Op::Prod(v[0].parse::<i64>().unwrap()),
_ => unreachable!(),
},
}
};
let test = get_last_token(lines[3]);
let monkey_true = get_last_token(lines[4]);
let monkey_false = get_last_token(lines[5]);
Ok(Monkey {
starting_items: items,
inspected_items: 0,
operation: op,
test,
monkey_true,
monkey_false,
})
}
}
fn solve_part_one(data: &str) -> i64 {
let monkeys_input: Vec<_> = data.split("\n\n").collect();
let mut monkeys: Vec<_> = monkeys_input
.iter()
.map(|monkey| Monkey::from_str(monkey).unwrap())
.collect();
for _ in 0..20 {
for i in 0..monkeys.len() {
while !monkeys[i].starting_items.is_empty() {
use Op::*;
monkeys[i].inspected_items += 1;
let mut worry = monkeys[i].starting_items[0];
match monkeys[i].operation {
Add(x) => worry += x,
Prod(x) => worry *= x,
Square => worry *= worry,
};
worry /= 3;
let monkey_truth = monkeys[i].monkey_true as usize;
let monkey_false = monkeys[i].monkey_false as usize;
match worry % monkeys[i].test == 0 {
true => monkeys[monkey_truth].starting_items.push_back(worry),
false => monkeys[monkey_false].starting_items.push_back(worry),
}
monkeys[i].starting_items.pop_front();
}
}
}
let mut inspected_items: Vec<_> = monkeys.iter().map(|x| x.inspected_items).collect();
inspected_items.sort();
inspected_items.reverse();
inspected_items.iter().take(2).product()
}
fn solve_part_two(data: &str) -> i64 {
let monkeys_input: Vec<_> = data.split("\n\n").collect();
let mut monkeys: Vec<_> = monkeys_input
.iter()
.map(|monkey| Monkey::from_str(monkey).unwrap())
.collect();
for _ in 0..10000 {
for i in 0..monkeys.len() {
let divisors_product: i64 = monkeys.iter().map(|x| x.test).product();
while !monkeys[i].starting_items.is_empty() {
use Op::*;
monkeys[i].inspected_items += 1;
let mut worry = monkeys[i].starting_items[0];
worry %= divisors_product;
match monkeys[i].operation {
Add(x) => worry = worry + x,
Prod(x) => worry = worry * x,
Square => worry = worry * worry,
};
let monkey_truth = monkeys[i].monkey_true as usize;
let monkey_false = monkeys[i].monkey_false as usize;
match worry % monkeys[i].test == 0 {
true => monkeys[monkey_truth].starting_items.push_back(worry),
false => monkeys[monkey_false].starting_items.push_back(worry),
}
monkeys[i].starting_items.pop_front();
}
}
}
let mut inspected_items: Vec<_> = monkeys
.iter()
.map(|x| x.inspected_items)
.collect::<Vec<_>>();
inspected_items.sort();
inspected_items.reverse();
inspected_items.iter().take(2).product()
}
fn main() {
let test = include_str!("../input/day11.test");
let prod = include_str!("../input/day11.prod");
println!("part1: test {:?}", solve_part_one(test));
println!("part1: prod {:?}", solve_part_one(prod));
println!("part2: test {:?}", solve_part_two(test));
println!("part2: prod {:?}", solve_part_two(prod));
}
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