7 files changed, 1173 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..a927ca7
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,23 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "anyhow"
+version = "1.0.75"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4668cab20f66d8d020e1fbc0ebe47217433c1b6c8f2040faf858554e394ace6"
+
+[[package]]
+name = "aoc_2023"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "indoc",
+]
+
+[[package]]
+name = "indoc"
+version = "2.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e186cfbae8084e513daff4240b4797e342f988cecda4fb6c939150f96315fd8"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..af1da44
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "aoc_2023"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.75"
+
+[dev-dependencies]
+indoc = "2.0.4"
diff --git a/input/day_01.txt b/input/day_01.txt
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diff --git a/src/day_01.rs b/src/day_01.rs
new file mode 100644
index 0000000..9c0310e
--- /dev/null
+++ b/src/day_01.rs
@@ -0,0 +1,103 @@
+use anyhow::Context;
+
+use crate::{Problem, Solution};
+
+pub struct Day01;
+
+impl Problem for Day01 {
+    const DAY: u8 = 1;
+
+    const INPUT: &'static str = include_str!("../input/day_01.txt");
+}
+
+impl Solution for Day01 {
+    type Answer1 = usize;
+
+    type Answer2 = usize;
+
+    fn part_1(input: &str) -> anyhow::Result<Self::Answer1> {
+        input.trim().split('\n').try_fold(0, |acc, line| {
+            let first = line
+                .chars()
+                .find_map(|c| c.to_digit(10).map(|n| n as usize))
+                .context("Failed to find first number")?;
+
+            let last = line
+                .chars()
+                .rev()
+                .find_map(|c| c.to_digit(10).map(|n| n as usize))
+                .unwrap_or(first);
+
+            Ok(acc + first * 10 + last)
+        })
+    }
+
+    fn part_2(input: &str) -> anyhow::Result<Self::Answer2> {
+        let words = [
+            "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine",
+        ];
+
+        input.trim().split('\n').try_fold(0, |acc, line| {
+            let mut buf = String::new();
+            let first = line
+                .chars()
+                .find_map(|c| {
+                    buf.push(c);
+                    words
+                        .iter()
+                        .enumerate()
+                        .find_map(|(n, w)| buf.contains(w).then_some(n))
+                        .or_else(|| c.to_digit(10).map(|n| n as usize))
+                })
+                .context("Failed to find first number")?;
+
+            buf.clear();
+            let last = line
+                .chars()
+                .rev()
+                .find_map(|c| {
+                    buf.insert(0, c);
+                    words
+                        .iter()
+                        .enumerate()
+                        .find_map(|(n, w)| buf.contains(w).then_some(n))
+                        .or_else(|| c.to_digit(10).map(|n| n as usize))
+                })
+                .unwrap_or(first);
+
+            Ok(acc + first * 10 + last)
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part_1() -> anyhow::Result<()> {
+        let input = indoc::indoc! {"
+            1abc2
+            pqr3stu8vwx
+            a1b2c3d4e5f
+            treb7uchet
+        "};
+
+        Ok(assert_eq!(142, Day01::part_1(input)?))
+    }
+
+    #[test]
+    fn test_part_2() -> anyhow::Result<()> {
+        let input = indoc::indoc! {"
+            two1nine
+            eightwothree
+            abcone2threexyz
+            xtwone3four
+            4nineeightseven2
+            zoneight234
+            7pqrstsixteen
+        "};
+
+        Ok(assert_eq!(281, Day01::part_2(input)?))
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..a895a9d
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,27 @@
+pub mod day_01;
+
+pub trait Solution: Problem {
+    type Answer1: std::fmt::Display + Default;
+
+    type Answer2: std::fmt::Display + Default;
+
+    fn part_1(input: &str) -> anyhow::Result<Self::Answer1>;
+
+    fn part_2(input: &str) -> anyhow::Result<Self::Answer2>;
+
+    fn solve() -> anyhow::Result<()> {
+        println!("Day {}.1", Self::DAY);
+        println!("{}\n", Self::part_1(Self::INPUT)?);
+
+        println!("Day {}.2", Self::DAY);
+        println!("{}\n", Self::part_2(Self::INPUT)?);
+
+        Ok(())
+    }
+}
+
+pub trait Problem {
+    const DAY: u8;
+
+    const INPUT: &'static str;
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..689a756
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,7 @@
+use aoc_2023::{day_01::Day01, Solution};
+
+fn main() -> anyhow::Result<()> {
+    Day01::solve()?;
+
+    Ok(())
+}