d21 with weird offset
This commit is contained in:
JonOfUs
parent
53a7a24e91
commit
8073809b28
4 changed files with 231 additions and 7 deletions
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...........
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.....###.#.
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.###.##..#.
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..#.#...#..
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....#.#....
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.##..S####.
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.##..#...#.
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.......##..
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.##.#.####.
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.##..##.##.
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...........
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131
res/21/input
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131
res/21/input
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@ -1,16 +1,98 @@
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use std::fs;
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use std::{fs, collections::{HashMap, VecDeque}};
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use num::Integer;
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pub fn solve() {
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let path = "res/21/example";
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let path = "res/21/input";
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let mut _contents = fs::read_to_string(path).expect("I/O error, wrong path?");
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let contents = fs::read_to_string(path).expect("I/O error, wrong path?");
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//let contents = BufReader::new(fs::File::open(path).expect("I/O error, wrong path?"));
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let grid: Vec<Vec<char>> = contents.lines().map(|line| line.chars().collect::<Vec<_>>()).collect();
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let result: usize = 0;
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let s = find_char_location(&grid, 'S').unwrap();
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const STEPS1: usize = 64;
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let map = floodfill(&grid, s, STEPS1);
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let result: usize = map.iter().filter(|(_, dist)| dist.is_even()).count();
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println!("Result 1: {result}");
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let result: usize = 0;
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const STEPS2: usize = 26501365;
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let x_len = grid.len();
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let y_len = grid[0].len();
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let steps_in_first = (x_len-1)/2;
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let copies_per_dir = (STEPS2-steps_in_first)/x_len;
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let pos_per_odd = floodfill(&grid, (0, 0), x_len+y_len).iter().filter(|(_, dist)| dist.is_odd()).count();
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let pos_per_even = floodfill(&grid, (0, 0), x_len+y_len).iter().filter(|(_, dist)| dist.is_even()).count();
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let cross = copies_per_dir * 2 * (pos_per_odd + pos_per_even) + pos_per_odd;
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let triangles = 4 * (1..copies_per_dir).map(|i| if i.is_odd() {i*pos_per_odd} else {i*pos_per_even}).sum::<usize>();
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let lefttop_odd = floodfill(&grid, (0,0), 64).iter().filter(|(_, dist)| dist.is_odd()).count();
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let righttop_odd = floodfill(&grid, (0,y_len-1), 64).iter().filter(|(_, dist)| dist.is_odd()).count();
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let leftbot_odd = floodfill(&grid, (x_len-1,0), 64).iter().filter(|(_, dist)| dist.is_odd()).count();
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let rightbot_odd = floodfill(&grid, (x_len-1,y_len-1), 64).iter().filter(|(_, dist)| dist.is_odd()).count();
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let lefttop_even = floodfill(&grid, (0,0), 64).iter().filter(|(_, dist)| dist.is_even()).count();
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let righttop_even = floodfill(&grid, (0,y_len-1), 64).iter().filter(|(_, dist)| dist.is_even()).count();
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let leftbot_even = floodfill(&grid, (x_len-1,0), 64).iter().filter(|(_, dist)| dist.is_even()).count();
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let rightbot_even = floodfill(&grid, (x_len-1,y_len-1), 64).iter().filter(|(_, dist)| dist.is_even()).count();
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let mut result = cross+triangles;
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result -= (copies_per_dir+1) * (lefttop_odd + righttop_odd + leftbot_odd + rightbot_odd + 1); // last 1 is very odd offset that fixes the result
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result += copies_per_dir * (lefttop_even + righttop_even + leftbot_even + rightbot_even);
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println!("Result 2: {result}");
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}
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fn find_char_location(matrix: &Vec<Vec<char>>, target_char: char) -> Option<(usize, usize)> {
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for (row_index, row) in matrix.iter().enumerate() {
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for (col_index, &ch) in row.iter().enumerate() {
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if ch == target_char {
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return Some((row_index, col_index));
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}
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}
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}
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None
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}
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fn floodfill(grid: &Vec<Vec<char>>, s: (usize,usize), steps: usize) -> HashMap<(usize,usize), usize> {
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let mut map: HashMap<(usize,usize), usize> = HashMap::new();
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let mut q: VecDeque<((usize, usize), usize)> = VecDeque::new();
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q.push_back((s, 0));
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while !q.is_empty() {
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let curr = q.pop_front().unwrap();
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if curr.1 > steps || map.contains_key(&curr.0) {
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continue
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}
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map.insert(curr.0, curr.1);
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let mut next: Vec<(usize,usize)> = vec!();
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if curr.0.0 > 0 {
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next.push((curr.0.0-1, curr.0.1))
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}
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if curr.0.1 > 0 {
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next.push((curr.0.0, curr.0.1-1))
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}
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if curr.0.0 < grid.len()-1 {
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next.push((curr.0.0+1, curr.0.1))
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}
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if curr.0.1 < grid[0].len()-1 {
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next.push((curr.0.0, curr.0.1+1))
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}
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for pos in next {
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if !map.contains_key(&pos) && grid[pos.0][pos.1] != '#' {
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q.push_back((pos, curr.1+1));
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}
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}
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}
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map
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}
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@ -5,7 +5,7 @@ extern crate scan_fmt;
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use std::time::Instant;
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fn main() {
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days::d20::solve()
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days::d21::solve()
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//_all_days()
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}
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@ -93,11 +93,11 @@ fn _all_days() {
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days::d20::solve();
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time = _print_elapsed(time);
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/*
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println!("\nDay 21");
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days::d21::solve();
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time = _print_elapsed(time);
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/*
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println!("\nDay 22");
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days::d22::solve();
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time = _print_elapsed(time);
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