Part 1

2022/rust/.envrc

@@ -0,0 +1 @@
+use flake

2022/rust/.gitignore

@@ -1 +1,2 @@
-target
+/target
+/.direnv

2022/rust/fetch_input.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env sh
 
-AOC_YEAR="${AOC_YEAR:-2022}"
+AOC_YEAR="${AOC_YEAR:-2023}"
 if [ "$#" -lt 1 ]; then
   echo "Error: No day provided"
   exit 1
@@ -22,4 +22,4 @@ else
   echo "Error: curl failed"
   rm -f "$f"
   exit 1
-fi
+fi

2022/rust/flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1700390070,
+        "narHash": "sha256-de9KYi8rSJpqvBfNwscWdalIJXPo8NjdIZcEJum1mH0=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e4ad989506ec7d71f7302cc3067abd82730a4beb",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e4ad989506ec7d71f7302cc3067abd82730a4beb",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

2022/rust/flake.nix

@@ -0,0 +1,27 @@
+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs?rev=e4ad989506ec7d71f7302cc3067abd82730a4beb";
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    supportedSystems = ["x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin"];
+    forEachSupportedSystem = f:
+      nixpkgs.lib.genAttrs supportedSystems (system:
+        f {
+          pkgs = import nixpkgs {inherit system;};
+        });
+  in {
+    devShells = forEachSupportedSystem ({pkgs}: {
+      default = pkgs.mkShell {
+        buildInputs = with pkgs; [
+          cargo
+          rustc
+          rustfmt
+          rustPackages.clippy
+          rust-analyzer
+          curl
+        ];
+      };
+    });
+  };
+}

2023/rust/src/day1.rs

@@ -7,13 +7,39 @@ fn main() {
 }
 
 struct Day1 {}
+impl Day1 {
+    fn calibration_value(line: &str) -> i128 {
+        println!("{line}");
+        let bytes = line.as_bytes();
+        let mut first_digit: Option<u8> = None;
+        let mut last_digit: Option<u8> = None;
+        for i in 0..bytes.len() {
+            let n = bytes.len() - 1 - i;
+            println!("{n} {i}");
+            if first_digit.is_none() && (0x30..=0x39).contains(&bytes[i]) {
+                first_digit = Some(bytes[i] - 0x30);
+                println!("found first {first_digit:?}");
+            }
+            if last_digit.is_none() && (0x30..=0x39).contains(&bytes[n]) {
+                last_digit = Some(bytes[n] - 0x30);
+                println!("found last {last_digit:?}");
+            }
+            if first_digit.is_some() && last_digit.is_some() {
+                break;
+            }
+        }
+        println!("{:?} {:?}", first_digit, last_digit);
+        Into::<i128>::into(first_digit.or(last_digit).unwrap() * 10)
+            + Into::<i128>::into(last_digit.or(first_digit).unwrap())
+    }
+}
+
 impl AoCSolution for Day1 {
     type Input = String;
     type Solution = i128;
 
     fn part1(input: Self::Input) -> Self::Solution {
-        println!("{}", input);
-        return 1;
+        input.lines().map(Self::calibration_value).sum()
     }
 
     fn part2(_input: Self::Input) -> Self::Solution {
@@ -27,7 +53,16 @@ mod tests {
 
     #[test]
     fn test() {
-        assert_eq!(Day1::part1("asdf".into()), 1);
-        assert_eq!(Day1::part2("asdf".into()), 2);
+        assert_eq!(
+            Day1::part1(
+                r#"1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet"#
+                    .into()
+            ),
+            142
+        );
+        assert_eq!(Day1::part2("asdf".into()), 0);
     }
 }