day11 part2 done

This commit is contained in:
Joe Ardent 2022-12-12 20:16:39 -08:00
parent da8635c06b
commit 5441906ea8

View file

@ -24,10 +24,10 @@ impl Default for Operation {
} }
impl Monkey { impl Monkey {
pub fn inspect(&mut self) -> Vec<(usize, u128)> { pub fn inspect(&mut self, reducer: &dyn Fn(u128) -> u128) -> Vec<(usize, u128)> {
let mut out = Vec::with_capacity(self.items.len()); let mut out = Vec::with_capacity(self.items.len());
while let Some(item) = self.items.pop_front() { while let Some(item) = self.items.pop_front() {
let item = self.op(item) / 3; let item = reducer(self.op(item));
if item % self.tmod == 0 { if item % self.tmod == 0 {
out.push((self.target.0, item)); out.push((self.target.0, item));
} else { } else {
@ -115,7 +115,7 @@ fn part1(troop: &[Monkey]) -> u128 {
for _round in 0..20 { for _round in 0..20 {
for i in 0..troop.len() { for i in 0..troop.len() {
let monkey = &mut troop[i]; let monkey = &mut troop[i];
let items = monkey.inspect(); let items = monkey.inspect(&|item| item / 3);
for (target, item) in items { for (target, item) in items {
let m = &mut troop[target]; let m = &mut troop[target];
m.items.push_back(item); m.items.push_back(item);
@ -128,7 +128,20 @@ fn part1(troop: &[Monkey]) -> u128 {
#[aoc_run(day11, part2)] #[aoc_run(day11, part2)]
fn part2(troop: &[Monkey]) -> u128 { fn part2(troop: &[Monkey]) -> u128 {
0 let max: u128 = troop.iter().map(|m| m.tmod).product();
let mut troop = troop.to_owned();
for _round in 0..10_000 {
for i in 0..troop.len() {
let monkey = &mut troop[i];
let items = monkey.inspect(&|item| item % max);
for (target, item) in items {
let m = &mut troop[target];
m.items.push_back(item);
}
}
}
troop.sort_by(|m1, m2| m2.business.cmp(&m1.business));
troop.iter().take(2).map(|m| m.business).product()
} }
#[cfg(test)] #[cfg(test)]
@ -172,129 +185,6 @@ Monkey 3:
#[test] #[test]
fn part2_test() { fn part2_test() {
let v = parse_input(INPUT); let v = parse_input(INPUT);
assert_eq!(part2(&v), 1); assert_eq!(part2(&v), 2713310158);
}
#[test]
fn leah_test() {
let troop = parse_input(
"Monkey 0:
Starting items: 54, 82, 90, 88, 86, 54
Operation: new = old * 7
Test: divisible by 11
If true: throw to monkey 2
If false: throw to monkey 6
Monkey 1:
Starting items: 91, 65
Operation: new = old * 13
Test: divisible by 5
If true: throw to monkey 7
If false: throw to monkey 4
Monkey 2:
Starting items: 62, 54, 57, 92, 83, 63, 63
Operation: new = old + 1
Test: divisible by 7
If true: throw to monkey 1
If false: throw to monkey 7
Monkey 3:
Starting items: 67, 72, 68
Operation: new = old * old
Test: divisible by 2
If true: throw to monkey 0
If false: throw to monkey 6
Monkey 4:
Starting items: 68, 89, 90, 86, 84, 57, 72, 84
Operation: new = old + 7
Test: divisible by 17
If true: throw to monkey 3
If false: throw to monkey 5
Monkey 5:
Starting items: 79, 83, 64, 58
Operation: new = old + 6
Test: divisible by 13
If true: throw to monkey 3
If false: throw to monkey 0
Monkey 6:
Starting items: 96, 72, 89, 70, 88
Operation: new = old + 4
Test: divisible by 3
If true: throw to monkey 1
If false: throw to monkey 2
Monkey 7:
Starting items: 79
Operation: new = old + 8
Test: divisible by 19
If true: throw to monkey 4
If false: throw to monkey 5",
);
assert_eq!(part1(&troop), 78960);
}
#[test]
fn rippy_part1() {
let input = "Monkey 0:
Starting items: 96, 60, 68, 91, 83, 57, 85
Operation: new = old * 2
Test: divisible by 17
If true: throw to monkey 2
If false: throw to monkey 5
Monkey 1:
Starting items: 75, 78, 68, 81, 73, 99
Operation: new = old + 3
Test: divisible by 13
If true: throw to monkey 7
If false: throw to monkey 4
Monkey 2:
Starting items: 69, 86, 67, 55, 96, 69, 94, 85
Operation: new = old + 6
Test: divisible by 19
If true: throw to monkey 6
If false: throw to monkey 5
Monkey 3:
Starting items: 88, 75, 74, 98, 80
Operation: new = old + 5
Test: divisible by 7
If true: throw to monkey 7
If false: throw to monkey 1
Monkey 4:
Starting items: 82
Operation: new = old + 8
Test: divisible by 11
If true: throw to monkey 0
If false: throw to monkey 2
Monkey 5:
Starting items: 72, 92, 92
Operation: new = old * 5
Test: divisible by 3
If true: throw to monkey 6
If false: throw to monkey 3
Monkey 6:
Starting items: 74, 61
Operation: new = old * old
Test: divisible by 2
If true: throw to monkey 3
If false: throw to monkey 1
Monkey 7:
Starting items: 76, 86, 83, 55
Operation: new = old + 4
Test: divisible by 5
If true: throw to monkey 4
If false: throw to monkey 0";
let troop = parse_input(input);
assert_eq!(part1(&troop), 56595);
} }
} }