- commit
- e49df461ecca8aeb51f36498bd6ea6a90c7ce92f
- parent
- 6d82bb5b76f5e11f770d9751b9b7d15a98411ae9
- Author
- Tobias Bengfort <tobias.bengfort@posteo.de>
- Date
- 2023-12-03 10:21
2023-12-03
Diffstat
| A | 2023/03/input.txt | 140 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/03/solution.rs | 103 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/03/test.txt | 10 | ++++++++++ |
3 files changed, 253 insertions, 0 deletions
diff --git a/2023/03/input.txt b/2023/03/input.txt
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diff --git a/2023/03/solution.rs b/2023/03/solution.rs
@@ -0,0 +1,103 @@
-1 1 #[path = "../lib.rs"]
-1 2 mod lib;
-1 3
-1 4 fn parse(line: &str) -> (Vec<(u32, usize, usize)>, Vec<usize>, Vec<usize>) {
-1 5 let mut numbers = vec![];
-1 6 let mut symbols = vec![];
-1 7 let mut gears = vec![];
-1 8 let mut number = 0;
-1 9 let mut number_len = 0;
-1 10
-1 11 for (x, c) in line.chars().enumerate() {
-1 12 if let Some(i) = c.to_digit(10) {
-1 13 number = number * 10 + i;
-1 14 number_len += 1;
-1 15 } else {
-1 16 if number > 0 {
-1 17 numbers.push((number, x - number_len, x));
-1 18 number = 0;
-1 19 number_len = 0;
-1 20 }
-1 21 if c != '.' {
-1 22 symbols.push(x);
-1 23 }
-1 24 if c == '*' {
-1 25 gears.push(x);
-1 26 }
-1 27 }
-1 28 }
-1 29
-1 30 if number > 0 {
-1 31 let x = line.len();
-1 32 numbers.push((number, x - number_len, x));
-1 33 }
-1 34
-1 35 return (numbers, symbols, gears);
-1 36 }
-1 37
-1 38 fn part1(numbers: &Vec<(u32, usize, usize)>, symbols: Vec<&Vec<usize>>) -> u32 {
-1 39 let mut sum = 0;
-1 40
-1 41 for (number, start, end) in numbers.iter() {
-1 42 let s = if *start > 1 { *start - 1 } else { *start };
-1 43 for x in (s)..(*end + 1) {
-1 44 if symbols.iter().any(|s| s.contains(&x)) {
-1 45 sum += number;
-1 46 break;
-1 47 }
-1 48 }
-1 49 }
-1 50
-1 51 return sum;
-1 52 }
-1 53
-1 54 fn part2(gears: &Vec<usize>, numbers: Vec<&Vec<(u32, usize, usize)>>) -> u32 {
-1 55 let mut sum = 0;
-1 56
-1 57 for gear in gears.iter() {
-1 58 let mut neighbors = vec![];
-1 59 for n in numbers.iter() {
-1 60 for (number, start, end) in n.iter() {
-1 61 if *gear + 1 >= *start && *gear < *end + 1 {
-1 62 neighbors.push(*number);
-1 63 }
-1 64 }
-1 65 }
-1 66 if neighbors.len() == 2 {
-1 67 sum += neighbors.iter().product::<u32>();
-1 68 }
-1 69 }
-1 70
-1 71 return sum;
-1 72 }
-1 73
-1 74 fn main() {
-1 75 let mut sum1 = 0;
-1 76 let mut sum2 = 0;
-1 77
-1 78 let mut prev_symbols;
-1 79 let mut curr_symbols = vec![];
-1 80 let mut next_symbols = vec![];
-1 81
-1 82 let mut prev_numbers;
-1 83 let mut curr_numbers = vec![];
-1 84 let mut next_numbers = vec![];
-1 85
-1 86 let mut curr_gears;
-1 87 let mut next_gears = vec![];
-1 88
-1 89 for line in lib::iter_input() {
-1 90 (prev_symbols, prev_numbers) = (curr_symbols, curr_numbers);
-1 91 (curr_symbols, curr_numbers, curr_gears) = (next_symbols, next_numbers, next_gears);
-1 92 (next_numbers, next_symbols, next_gears) = parse(&line);
-1 93
-1 94 sum1 += part1(&curr_numbers, vec![&prev_symbols, &curr_symbols, &next_symbols]);
-1 95 sum2 += part2(&curr_gears, vec![&prev_numbers, &curr_numbers, &next_numbers]);
-1 96 }
-1 97
-1 98 sum1 += part1(&next_numbers, vec![&curr_symbols, &next_symbols]);
-1 99 sum2 += part2(&next_gears, vec![&curr_numbers, &next_numbers]);
-1 100
-1 101 println!("part1: {}", sum1);
-1 102 println!("part2: {}", sum2);
-1 103 }
diff --git a/2023/03/test.txt b/2023/03/test.txt
@@ -0,0 +1,10 @@ -1 1 467..114.. -1 2 ...*...... -1 3 ..35..633. -1 4 ......#... -1 5 617*...... -1 6 .....+.58. -1 7 ..592..... -1 8 ......755. -1 9 ...$.*.... -1 10 .664.598..