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Code Issues Projects Releases Wiki Activity

Implement 2022 day 23 part 2

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Bert Peters
2022-12-23 18:14:23 +01:00
parent 45e0cd6273
commit 72504d71ef
3 changed files with 114 additions and 10 deletions
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2022/inputs/23.txt Normal file
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39
2022/src/day23.rs
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@@ -90,11 +90,23 @@ fn print(elves: &AHashSet<Vec2>) -> Result<()> {
pub fn part1(input: &[u8]) -> Result<String> {
let mut elves = parse_input(input, parse_elves)?;
simulate(&mut elves, 10);
let (x_bounds, y_bounds) = determine_bounding_box(&elves)?;
let area = (x_bounds.end() - x_bounds.start() + 1) * (y_bounds.end() - y_bounds.start() + 1);
let free = area - elves.len() as i32;
Ok(free.to_string())
}
fn simulate(elves: &mut AHashSet<Vec2>, max: usize) -> Option<usize> {
let mut todo = Vec::new();
let mut to_return = Vec::new();
let mut origin = AHashMap::new();
for it in 0..10 {
for it in 0..max {
// Remove all todos from a previous iteration
todo.clear();
@@ -148,6 +160,10 @@ pub fn part1(input: &[u8]) -> Result<String> {
}
}
if origin.is_empty() {
return Some(it + 1);
}
// Remove entries we processed
for elf in &todo {
elves.remove(elf);
@@ -160,17 +176,15 @@ pub fn part1(input: &[u8]) -> Result<String> {
elves.extend(origin.drain().map(|(dest, _)| dest));
}
let (x_bounds, y_bounds) = determine_bounding_box(&elves)?;
let area = (x_bounds.end() - x_bounds.start() + 1) * (y_bounds.end() - y_bounds.start() + 1);
let free = area - elves.len() as i32;
Ok(free.to_string())
None
}
pub fn part2(_input: &[u8]) -> Result<String> {
anyhow::bail!("not implemented")
pub fn part2(input: &[u8]) -> Result<String> {
let mut elves = parse_input(input, parse_elves)?;
let first_non_moved = simulate(&mut elves, usize::MAX).context("Elves didn't stop moving?")?;
Ok(first_non_moved.to_string())
}
#[cfg(test)]
@@ -183,4 +197,9 @@ mod tests {
fn sample_part1() {
assert_eq!(part1(SAMPLE).unwrap(), "110");
}
#[test]
fn sample_part2() {
assert_eq!(part2(SAMPLE).unwrap(), "20");
}
}

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