Merge branch 'day-15'

2023/day-15/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "day-15"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+color-eyre.workspace = true
+itertools.workspace = true

2023/day-15/src/bin/part1.rs

@@ -0,0 +1,9 @@
+use color_eyre::Result;
+use day_15::part1::process;
+
+fn main() -> Result<()> {
+    let file = include_str!("../../input.txt");
+    let result = process(file)?;
+    println!("{}", result);
+    Ok(())
+}

2023/day-15/src/bin/part2.rs

@@ -0,0 +1,9 @@
+use color_eyre::Result;
+use day_15::part2::process;
+
+fn main() -> Result<()> {
+    let file = include_str!("../../input.txt");
+    let result = process(file)?;
+    println!("{}", result);
+    Ok(())
+}

2023/day-15/src/lib.rs

@@ -0,0 +1,2 @@
+pub mod part1;
+pub mod part2;

2023/day-15/src/part1.rs

@@ -0,0 +1,24 @@
+use color_eyre::Result;
+
+pub fn process(input: &str) -> Result<usize> {
+    let num = input
+        .split(",")
+        .map(|hash| {
+            hash.chars()
+                .fold(0, |acc, next_char| (acc + (next_char as usize)) * 17 % 256)
+        })
+        .sum();
+    Ok(num)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_process() -> Result<()> {
+        let input = "rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7";
+        assert_eq!(1320, process(input)?);
+        Ok(())
+    }
+}

2023/day-15/src/part2.rs

@@ -0,0 +1,19 @@
+use color_eyre::Result;
+
+pub fn process(input: &str) -> Result<usize> {
+    todo!("day xx - part 2");
+    Ok(0)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_process() -> Result<()> {
+        let input = "";
+        todo!("haven't built test yet");
+        assert_eq!(0, process(input)?);
+        Ok(())
+    }
+}