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authorSanto Cariotti <santo@dcariotti.me>2023-12-15 21:47:10 +0100
committerSanto Cariotti <santo@dcariotti.me>2023-12-15 21:47:10 +0100
commit67dff579e91c13ef40ecb17d14497d145861c5e7 (patch)
tree3ec7cccea75ba25aa0da34f528811d28f6c9b21a /2023/day11
parent49ecb2db619bb32c712e619ec66833a917b5ffc3 (diff)
add day15 pt1
Diffstat (limited to '2023/day11')
-rw-r--r--2023/day11/src/lib.rs26
1 files changed, 26 insertions, 0 deletions
diff --git a/2023/day11/src/lib.rs b/2023/day11/src/lib.rs
index 938de38..66c95c4 100644
--- a/2023/day11/src/lib.rs
+++ b/2023/day11/src/lib.rs
@@ -67,6 +67,32 @@ pub fn part1(input: &str) -> u32 {
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
}