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-rw-r--r--2023/day1/src/lib.rs97
1 files changed, 97 insertions, 0 deletions
diff --git a/2023/day1/src/lib.rs b/2023/day1/src/lib.rs
new file mode 100644
index 0000000..3240d6d
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+++ b/2023/day1/src/lib.rs
@@ -0,0 +1,97 @@
+pub fn part1(input: &str) -> u32 {
+ let mut res: u32 = 0;
+
+ for line in input.split('\n') {
+ let mut d1: i32 = -1;
+ let mut d2: i32 = -1;
+ for ch in line.chars() {
+ if ch.is_digit(10) {
+ if d1 == -1 {
+ d1 = ch.to_digit(10).unwrap() as i32 * 10;
+ }
+
+ d2 = ch.to_digit(10).unwrap() as i32;
+ }
+ }
+
+ if d1 + d2 > 0 {
+ res += (d1 + d2) as u32;
+ }
+ }
+
+ res
+}
+
+pub fn part2(input: &str) -> u32 {
+ let mut res: u32 = 0;
+
+ let hs: [(&str, u32); 18] = [
+ ("one", 1),
+ ("1", 1),
+ ("two", 2),
+ ("2", 2),
+ ("three", 3),
+ ("3", 3),
+ ("four", 4),
+ ("4", 4),
+ ("five", 5),
+ ("5", 5),
+ ("six", 6),
+ ("6", 6),
+ ("seven", 7),
+ ("7", 7),
+ ("eight", 8),
+ ("8", 8),
+ ("nine", 9),
+ ("9", 9),
+ ];
+
+ for (i, line) in input.strip_suffix('\n').unwrap().split('\n').enumerate() {
+ let mut idx: Vec<(i32, u32)> = vec![];
+ for (k, v) in &hs {
+ let ms: Vec<_> = line.match_indices(k).collect();
+ for m in ms.iter() {
+ idx.push((m.0 as i32, *v));
+ }
+ }
+
+ idx.sort_by(|a, b| a.0.cmp(&b.0));
+ println!("{i} {}", idx[0].1 * 10 + idx[idx.len() - 1].1);
+ res += idx[0].1 * 10 + idx[idx.len() - 1].1;
+ }
+
+ res
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn example_part1() {
+ let input = include_str!("../example.txt");
+ let result = part1(input);
+ assert_eq!(result, 142);
+ }
+
+ #[test]
+ fn input_part1() {
+ let input = include_str!("../input.txt");
+ let result = part1(input);
+ assert_eq!(result, 54159);
+ }
+
+ #[test]
+ fn example_part2() {
+ let input = include_str!("../example2.txt");
+ let result = part2(input);
+ assert_eq!(result, 281);
+ }
+
+ #[test]
+ fn input_part2() {
+ let input = include_str!("../input2.txt");
+ let result = part2(input);
+ assert_eq!(result, 53866);
+ }
+}