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View file

@ -1,63 +1,77 @@
use std::{cmp::max, collections::HashSet, io::stdin}; use std::{
collections::{HashSet, VecDeque},
io::stdin,
};
use anyhow::{bail, Result}; use anyhow::Result;
fn main() -> Result<()> { fn main() -> Result<()> {
let mut grid = vec![]; let mut grid = vec![];
let mut galaxies = HashSet::new(); let mut start = (0, 0);
let mut occupied_columns = HashSet::new();
let mut occupied_rows = HashSet::new();
let mut max_x = 0; let mut max_x = 0;
let mut max_y = 0; let mut max_y = 0;
for (y, line) in stdin().lines().map_while(Result::ok).enumerate() { for (y, line) in stdin().lines().map_while(Result::ok).enumerate() {
if let Some(x) = line.find('S') {
start = (x, y);
}
let cells: Vec<char> = line.chars().collect(); let cells: Vec<char> = line.chars().collect();
max_y = max(max_y, y); max_x = std::cmp::max(max_x, cells.len() - 1);
for (x, c) in cells.iter().enumerate() { max_y = std::cmp::max(max_y, y);
max_x = max(max_x, x);
if *c == '#' {
galaxies.insert((x, y));
occupied_columns.insert(x);
occupied_rows.insert(y);
}
}
grid.push(cells); grid.push(cells);
} }
let mut front = VecDeque::new();
let mut empty_columns: Vec<usize> = HashSet::from_iter(0..max_x) let mut visited: HashSet<(usize, usize)> = HashSet::new();
.difference(&occupied_columns) front.push_back((start.0, start.1, 0));
.copied() loop {
.collect(); let Some((x, y, depth)) = front.pop_front() else {
let mut empty_rows: Vec<usize> = HashSet::from_iter(0..max_y) break;
.difference(&occupied_rows)
.copied()
.collect();
empty_columns.sort();
empty_rows.sort();
let mut expanded_galaxies = HashSet::new();
let expansion = 1_000_000;
for (x, y) in galaxies.into_iter() {
let Err(col) = empty_columns.binary_search(&x) else {
bail!("x={x} found in empty columns");
}; };
let new_x = x + col * (expansion - 1); if visited.contains(&(x, y)) {
let Err(row) = empty_rows.binary_search(&y) else { continue;
bail!("y={y} found in empty rows"); }
visited.insert((x, y));
let c = grid[y][x];
if "S-FL".contains(c) && x < max_x && "-J7".contains(grid[y][x + 1]) {
front.push_back((x + 1, y, depth + 1));
}
if "S-7J".contains(c) && x > 0 && "-LF".contains(grid[y][x - 1]) {
front.push_back((x - 1, y, depth + 1));
}
if "S|JL".contains(c) && y > 0 && "|7F".contains(grid[y - 1][x]) {
front.push_back((x, y - 1, depth + 1));
}
if "S|F7".contains(c) && y < max_y && "|JL".contains(grid[y + 1][x]) {
front.push_back((x, y + 1, depth + 1));
}
}
let mut enclosed = 0;
for j in 0..(max_x + max_y + 2) {
println!("j={j}");
let mut outside = true;
for x in 0..=j {
let y = j - x;
let Some(row) = grid.get(y) else {
continue;
}; };
let new_y = y + row * (expansion - 1); let Some(c) = row.get(x) else {
expanded_galaxies.insert((new_x, new_y)); continue;
};
let o = outside;
// in my input, S is equivalent to 7, so outside flips
let v = visited.contains(&(x, y));
if v {
if "-|SL7".contains(*c) {
outside = !outside;
} }
let mut sum = 0; } else if !outside {
for a in expanded_galaxies.iter() { enclosed += 1;
for b in expanded_galaxies.iter() { }
let dx = i64::abs(a.0 as i64 - b.0 as i64); println!(" {x} {y} visited={v} c={c} outside={o} -> {outside} enclosed={enclosed}",);
let dy = i64::abs(a.1 as i64 - b.1 as i64);
// println!("{a:?} -> {b:?} = {}", dx + dy);
sum += dx + dy;
} }
} }
sum /= 2; println!("{enclosed}");
println!("{sum}");
Ok(()) Ok(())
} }