73 lines
1.7 KiB
Rust
73 lines
1.7 KiB
Rust
use std::fs::read_to_string;
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fn difference(lhs: usize, rhs: usize) -> usize {
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if lhs > rhs {
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return lhs - rhs;
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}
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rhs - lhs
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}
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fn main() {
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let input = read_to_string("input.txt").unwrap();
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let mut starmap = input.lines().map(|line| {
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let mut vec: Vec<u8> = Vec::new();
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vec.extend_from_slice(line.as_bytes());
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vec
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}).collect::<Vec<_>>();
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let mut index = 0;
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loop {
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if index == starmap.len() {
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break;
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}
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if starmap[index].iter().filter(|ch| { **ch == b'#' }).count() == 0 {
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starmap.insert(index, starmap[index].clone());
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index += 1;
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}
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index += 1;
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}
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index = 0;
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loop {
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if index >= starmap[0].len() {
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break;
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}
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let mut sum = 0;
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for line in &starmap {
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if line[index] == b'#' {
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sum += 1;
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}
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}
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if sum == 0 {
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for line in &mut starmap {
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line.insert(index, b'.');
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}
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index += 1;
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}
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index += 1;
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}
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let mut stars: Vec<(usize, usize)> = Vec::new();
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for row in 0..starmap.len() {
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for col in 0..starmap[row].len() {
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if starmap[row][col] == b'#' {
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stars.push((row, col));
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}
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}
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}
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let mut sum_difference = 0;
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for start_idx in 0..stars.len() {
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for inner_idx in start_idx..stars.len() {
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sum_difference += difference(stars[start_idx].0, stars[inner_idx].0);
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sum_difference += difference(stars[start_idx].1, stars[inner_idx].1);
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}
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}
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println!("Sum of ranges: {}", sum_difference);
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}
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