1 files changed, 73 insertions, 0 deletions
diff --git a/src/bin/2023/day1.rs b/src/bin/2023/day1.rs
new file mode 100644
index 0000000..af98533
--- /dev/null
+++ b/src/bin/2023/day1.rs
@@ -0,0 +1,73 @@
+#![allow(dead_code)]
+#![allow(unused_variables)]
+
+use advent_of_code::prelude::*;
+
+const NUMBERS: [&str; 10] = [
+    "zero", "one", "two", "three", "four", "five", "six", "seven", "eight",
+    "nine",
+];
+
+pub fn parse(fh: File) -> Result<impl Iterator<Item = String>> {
+    Ok(parse::lines(fh))
+}
+
+pub fn part1(lines: impl Iterator<Item = String>) -> Result<i64> {
+    let mut total = 0;
+    for line in lines {
+        let first = line.chars().find(char::is_ascii_digit).unwrap();
+        let last = line.chars().rev().find(char::is_ascii_digit).unwrap();
+        let val: i64 = format!("{}{}", first, last).parse().unwrap();
+        total += val;
+    }
+    Ok(total)
+}
+
+pub fn part2(lines: impl Iterator<Item = String>) -> Result<i64> {
+    let mut total = 0;
+    for line in lines {
+        let mut first = 0;
+        let mut last = 0;
+        'c: for idx in 0..line.len() {
+            let c = line.chars().nth(idx).unwrap();
+            if char::is_numeric(c) {
+                first = i64::from(u32::from(c) - u32::from('0'));
+                break 'c;
+            }
+            for (i, n) in NUMBERS.iter().enumerate() {
+                if line[idx..].starts_with(n) {
+                    first = i64::try_from(i).unwrap();
+                    break 'c;
+                }
+            }
+        }
+        'c: for idx in (0..line.len()).rev() {
+            let c = line.chars().nth(idx).unwrap();
+            if char::is_numeric(c) {
+                last = i64::from(u32::from(c) - u32::from('0'));
+                break 'c;
+            }
+            for (i, n) in NUMBERS.iter().enumerate() {
+                if line[..=idx].ends_with(n) {
+                    last = i64::try_from(i).unwrap();
+                    break 'c;
+                }
+            }
+        }
+        let val: i64 = format!("{}{}", first, last).parse().unwrap();
+        total += val;
+    }
+    Ok(total)
+}
+
+#[test]
+fn test() {
+    assert_eq!(
+        part1(parse(parse::data(2023, 1).unwrap()).unwrap()).unwrap(),
+        54927
+    );
+    assert_eq!(
+        part2(parse(parse::data(2023, 1).unwrap()).unwrap()).unwrap(),
+        54581
+    );
+}