- commit
- 18f5919f86025a58624a35f4bd5e7a8729e5b317
- parent
- b8abde72fc085b81597438e99fdbd8dad857d85e
- Author
- Tobias Bengfort <tobias.bengfort@posteo.de>
- Date
- 2023-12-14 09:24
2023-12-14
Diffstat
| A | 2023/14/input.txt | 100 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/14/part1.rs | 33 | +++++++++++++++++++++++++++++++++ |
| A | 2023/14/solution.rs | 163 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/14/test.txt | 10 | ++++++++++ |
4 files changed, 306 insertions, 0 deletions
diff --git a/2023/14/input.txt b/2023/14/input.txt
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diff --git a/2023/14/part1.rs b/2023/14/part1.rs
@@ -0,0 +1,33 @@
-1 1 #[path = "../lib.rs"]
-1 2 mod lib;
-1 3
-1 4 fn main() {
-1 5 let mut width = 0;
-1 6 let mut height = 0;
-1 7 let mut cols = vec![];
-1 8 let mut sum = 0;
-1 9 let mut count = 0;
-1 10
-1 11 for (y, line) in lib::iter_input().enumerate() {
-1 12 height = y;
-1 13 if width == 0 {
-1 14 width = line.len();
-1 15 cols = vec![0; width];
-1 16 }
-1 17
-1 18 for (x, b) in line.bytes().enumerate() {
-1 19 match b {
-1 20 b'#' => { cols[x] = y + 1 },
-1 21 b'O' => {
-1 22 sum += cols[x];
-1 23 cols[x] += 1;
-1 24 count += 1;
-1 25 },
-1 26 b'.' => {},
-1 27 _ => unreachable!(),
-1 28 }
-1 29 }
-1 30 }
-1 31
-1 32 println!("part1: {}", count * (height + 1) - sum);
-1 33 }
diff --git a/2023/14/solution.rs b/2023/14/solution.rs
@@ -0,0 +1,163 @@
-1 1 #[path = "../lib.rs"]
-1 2 mod lib;
-1 3
-1 4 enum Cell {
-1 5 Square,
-1 6 Round,
-1 7 Empty,
-1 8 }
-1 9
-1 10 fn parse_input() -> Vec<Vec<Cell>> {
-1 11 return lib::iter_input()
-1 12 .map(|line| {
-1 13 line.bytes()
-1 14 .map(|b| match b {
-1 15 b'#' => Cell::Square,
-1 16 b'O' => Cell::Round,
-1 17 b'.' => Cell::Empty,
-1 18 _ => unreachable!(),
-1 19 })
-1 20 .collect()
-1 21 })
-1 22 .collect();
-1 23 }
-1 24
-1 25 fn tilt_north(rows: &mut Vec<Vec<Cell>>) {
-1 26 for x in 0..rows[0].len() {
-1 27 let mut next = 0;
-1 28 for y in 0..rows.len() {
-1 29 match rows[y][x] {
-1 30 Cell::Empty => {}
-1 31 Cell::Square => next = y + 1,
-1 32 Cell::Round => {
-1 33 rows[y][x] = Cell::Empty;
-1 34 rows[next][x] = Cell::Round;
-1 35 next += 1;
-1 36 }
-1 37 }
-1 38 }
-1 39 }
-1 40 }
-1 41
-1 42 fn tilt_south(rows: &mut Vec<Vec<Cell>>) {
-1 43 let last = rows.len() - 1;
-1 44 for x in 0..rows[0].len() {
-1 45 let mut next = 0;
-1 46 for y in 0..rows.len() {
-1 47 match rows[last - y][x] {
-1 48 Cell::Empty => {}
-1 49 Cell::Square => next = y + 1,
-1 50 Cell::Round => {
-1 51 rows[last - y][x] = Cell::Empty;
-1 52 rows[last - next][x] = Cell::Round;
-1 53 next += 1;
-1 54 }
-1 55 }
-1 56 }
-1 57 }
-1 58 }
-1 59
-1 60 fn tilt_west(rows: &mut Vec<Vec<Cell>>) {
-1 61 for y in 0..rows.len() {
-1 62 let mut next = 0;
-1 63 for x in 0..rows[0].len() {
-1 64 match rows[y][x] {
-1 65 Cell::Empty => {}
-1 66 Cell::Square => next = x + 1,
-1 67 Cell::Round => {
-1 68 rows[y][x] = Cell::Empty;
-1 69 rows[y][next] = Cell::Round;
-1 70 next += 1;
-1 71 }
-1 72 }
-1 73 }
-1 74 }
-1 75 }
-1 76
-1 77 fn tilt_east(rows: &mut Vec<Vec<Cell>>) {
-1 78 let last = rows[0].len() - 1;
-1 79 for y in 0..rows.len() {
-1 80 let mut next = 0;
-1 81 for x in 0..rows[0].len() {
-1 82 match rows[y][last - x] {
-1 83 Cell::Empty => {}
-1 84 Cell::Square => next = x + 1,
-1 85 Cell::Round => {
-1 86 rows[y][last - x] = Cell::Empty;
-1 87 rows[y][last - next] = Cell::Round;
-1 88 next += 1;
-1 89 }
-1 90 }
-1 91 }
-1 92 }
-1 93 }
-1 94
-1 95 fn cycle(rows: &mut Vec<Vec<Cell>>) {
-1 96 tilt_north(rows);
-1 97 tilt_west(rows);
-1 98 tilt_south(rows);
-1 99 tilt_east(rows);
-1 100 }
-1 101
-1 102 fn hash(rows: &Vec<Vec<Cell>>) -> Vec<(usize, usize)> {
-1 103 let mut hash = vec![];
-1 104 for y in 0..rows.len() {
-1 105 for x in 0..rows[0].len() {
-1 106 match rows[y][x] {
-1 107 Cell::Round => hash.push((x, y)),
-1 108 _ => {}
-1 109 }
-1 110 }
-1 111 }
-1 112 return hash;
-1 113 }
-1 114
-1 115 fn weigh(rows: &Vec<Vec<Cell>>) -> usize {
-1 116 let mut sum = 0;
-1 117 for y in 0..rows.len() {
-1 118 for cell in rows[y].iter() {
-1 119 match cell {
-1 120 Cell::Round => sum += rows.len() - y,
-1 121 _ => {}
-1 122 }
-1 123 }
-1 124 }
-1 125 return sum;
-1 126 }
-1 127
-1 128 fn part1() {
-1 129 let mut rows = parse_input();
-1 130 tilt_north(&mut rows);
-1 131 let weight = weigh(&rows);
-1 132 println!("part1: {}", weight);
-1 133 }
-1 134
-1 135 fn part2() {
-1 136 let mut rows = parse_input();
-1 137
-1 138 let period;
-1 139 let mut history = vec![];
-1 140 history.push(hash(&rows));
-1 141 loop {
-1 142 cycle(&mut rows);
-1 143 let hash = hash(&rows);
-1 144 if let Some(i) = history.iter().position(|h| *h == hash) {
-1 145 period = history.len() - i;
-1 146 break;
-1 147 } else {
-1 148 history.push(hash);
-1 149 }
-1 150 }
-1 151
-1 152 for _ in 0..((1_000_000_000 - history.len()) % period) {
-1 153 cycle(&mut rows);
-1 154 }
-1 155
-1 156 let weight = weigh(&rows);
-1 157 println!("part2: {}", weight);
-1 158 }
-1 159
-1 160 fn main() {
-1 161 part1();
-1 162 part2();
-1 163 }
diff --git a/2023/14/test.txt b/2023/14/test.txt
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