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fn expand(m: &mut Vec<Vec<i16>>, ch: i16) {
let rows = m.len();
let mut cols = m[0].len();
let mut i = 0;
while i < rows {
if m[i].iter().filter(|&x| *x != 0).count() == 0 {
m.insert(i, vec![ch; cols]);
i += 1;
}
i += 1;
}
let rows = m.len();
i = 0;
while i < cols {
let mut c = 0;
for j in 0..rows {
if m[j][i] != 0 {
c += 1;
}
}
if c == 0 {
for j in 0..rows {
m[j].insert(i, ch);
}
cols += 1;
i += 1;
}
i += 1;
}
}
pub fn part1(input: &str) -> u32 {
let mut res: u32 = 0;
let mut m: Vec<Vec<i16>> = input
.trim_end()
.split('\n')
.map(|y| y.chars().map(|x| if x == '#' { 1 } else { 0 }).collect())
.collect();
expand(&mut m, 0);
let mut hs: Vec<(usize, usize)> = vec![];
let rows = m.len();
let cols = m[0].len();
for i in 0..rows {
for j in 0..cols {
if m[i][j] != 0 {
hs.push((i, j));
}
}
}
let n = hs.len();
for i in 0..n {
for j in i + 1..n {
res += ((hs[j].1 as i16 - hs[i].1 as i16).abs()
+ (hs[j].0 as i16 - hs[i].0 as i16).abs()) as u32;
}
}
res
}
pub fn part2(input: &str) -> u32 {
let mut res: u32 = 0;
let mut m: Vec<Vec<i16>> = input
.trim_end()
.split('\n')
.map(|y| y.chars().map(|x| if x == '#' { 1 } else { 0 }).collect())
.collect();
expand(&mut m, 1);
let mut hs: Vec<(usize, usize)> = vec![];
let rows = m.len();
let cols = m[0].len();
for i in 0..rows {
for j in 0..cols {
if m[i][j] > 0 {
hs.push((i, j));
}
}
}
let n = hs.len();
for i in 0..n {
for j in i + 1..n {
res += ((hs[j].1 as i16 - hs[i].1 as i16).abs()
+ (hs[j].0 as i16 - hs[i].0 as i16).abs()) as u32;
}
}
res
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn example_part1() {
let input = include_str!("../example.txt");
let result = part1(input);
assert_eq!(result, 374);
}
#[test]
fn input_part1() {
let input = include_str!("../input.txt");
let result = part1(input);
assert_eq!(result, 9623138);
}
#[test]
fn example_part2() {
let input = include_str!("../example.txt");
let result = part2(input);
assert_eq!(result, 1030);
}
//
// #[test]
// fn input_part2() {
// let input = include_str!("../input.txt");
// let result = part2(input);
// assert_eq!(result, 71585);
// }
}
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