Checking in what remains of AoC 2022

2022/Cargo.lock

@@ -2,6 +2,14 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "aoc-2022"
+version = "0.1.0"
+dependencies = [
+ "nom",
+ "substring",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@@ -30,14 +38,6 @@ dependencies = [
  "minimal-lexical",
 ]
 
-[[package]]
-name = "problems"
-version = "0.1.0"
-dependencies = [
- "nom",
- "substring",
-]
-
 [[package]]
 name = "substring"
 version = "1.4.5"

2022/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "problems"
+name = "aoc-2022"
 version = "0.1.0"
 edition = "2021"
 

2022/data/day8.txt

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2022/src/day5.rs

@@ -1,3 +1,4 @@
+use crate::matrix::Matrix;
 use nom::{
     bytes::complete::tag,
     character::complete::{anychar, char, space0, space1, u8},
@@ -57,40 +58,6 @@ struct Command {
     dest: u8,
 }
 
-#[derive(Clone, Debug, PartialEq)]
-struct Matrix<T> {
-    rows: usize,
-    cols: usize,
-    data: Vec<Vec<T>>,
-}
-
-impl<T: Clone + Copy + Debug> Matrix<T> {
-    fn new(data: Vec<Vec<T>>) -> Self {
-        let rows = data.len();
-        let cols = data
-            .iter()
-            .fold(0, |max, row| std::cmp::max(max, row.len()));
-        Self { rows, cols, data }
-    }
-
-    fn rotate_cw(self) -> Self {
-        let mut data = Vec::new();
-        for col_idx in 0..self.cols {
-            let mut row = vec![];
-            for row_idx in 0..self.rows {
-                row.push(self.data[self.rows - row_idx - 1][col_idx]);
-            }
-            data.push(row);
-        }
-
-        Self {
-            rows: self.cols,
-            cols: self.rows,
-            data,
-        }
-    }
-}
-
 #[derive(Debug)]
 struct Stack<T>(Vec<T>);
 
@@ -313,27 +280,4 @@ move 1 from 1 to 2";
             assert_eq!(tops(stacks), "CMZ");
         });
     }
-
-    #[test]
-    fn it_can_rotate_symmetrix_matrix() {
-        let matrix = Matrix::new(vec![vec!['A', 'B'], vec!['C', 'D']]);
-        let expected = Matrix::new(vec![vec!['C', 'A'], vec!['D', 'B']]);
-        assert_eq!(matrix.rotate_cw(), expected);
-    }
-
-    #[test]
-    fn it_can_rotate_asymmetric_matrix() {
-        let matrix = Matrix::new(vec![
-            vec![Some('A'), Some('B'), Some('C')],
-            vec![Some('D'), Some('E'), Some('F')],
-        ]);
-        let expected = Matrix::new(vec![
-            vec![Some('D'), Some('A')],
-            vec![Some('E'), Some('B')],
-            vec![Some('F'), Some('C')],
-        ]);
-        print_matrix(&matrix);
-        print_matrix(&matrix.clone().rotate_cw());
-        assert_eq!(matrix.rotate_cw(), expected);
-    }
 }

2022/src/day8.rs

@@ -0,0 +1,106 @@
+use crate::matrix::Matrix;
+
+const INPUT: &str = include_str!("../data/day8.txt");
+
+pub fn part1() -> String {
+    format!("{}", count_visible_trees(input(INPUT)))
+}
+
+pub fn part2() -> String {
+    unimplemented!()
+}
+
+fn count_visible_trees(data: Matrix<u32>) -> usize {
+    let mut cnt = 0;
+    for row_idx in 0..data.rows {
+        for col_idx in 0..data.cols {
+            if is_visible(&data, row_idx, col_idx) {
+                cnt = cnt + 1;
+            }
+        }
+    }
+    cnt
+}
+
+fn is_visible(data: &Matrix<u32>, row_idx: usize, col_idx: usize) -> bool {
+    is_visible_vec(data.row(row_idx), col_idx) || is_visible_vec(data.col(col_idx), row_idx)
+}
+
+fn is_visible_vec(data: Vec<u32>, cell: usize) -> bool {
+    let (before, rest) = data.split_at(cell);
+    let (target, after) = rest.split_at(1);
+    let target = target[0];
+    let before = before.into_iter().all(|tree| *tree < target);
+    let after = after.into_iter().all(|tree| *tree < target);
+    before || after
+}
+
+fn scenic_score(data: &Matrix<u32>, row_idx: usize, col_idx: usize) -> u32 {}
+
+fn scenic_score_vec(data: &Matrix<u32>, cell: usize) -> u32 {
+    let (before, rest) = data.split_at(cell);
+    let (target, after) = rest.split_at(1);
+    let target = target[0];
+}
+
+fn input(data: &str) -> Matrix<u32> {
+    Matrix::new(
+        data.lines()
+            .map(|line| {
+                line.chars()
+                    .map(|c| c.to_digit(10).unwrap())
+                    .collect::<Vec<u32>>()
+            })
+            .collect::<Vec<Vec<u32>>>(),
+    )
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    const TEST_DATA: &str = "30373
+25512
+65332
+33549
+35390";
+
+    fn with_input<F>(test: F)
+    where
+        F: Fn(Matrix<u32>) -> () + std::panic::UnwindSafe,
+    {
+        test(input(TEST_DATA));
+    }
+
+    #[test]
+    fn it_tests_visibility() {
+        with_input(|forest| {
+            assert_eq!(is_visible(&forest, 0, 0), true);
+            assert_eq!(is_visible(&forest, 1, 2), true);
+            assert_eq!(is_visible(&forest, 1, 2), true);
+            assert_eq!(is_visible(&forest, 1, 3), false);
+            assert_eq!(is_visible(&forest, 2, 1), true);
+            assert_eq!(is_visible(&forest, 2, 2), false);
+            assert_eq!(is_visible(&forest, 2, 3), true);
+            assert_eq!(is_visible(&forest, 3, 1), false);
+            assert_eq!(is_visible(&forest, 3, 2), true);
+            assert_eq!(is_visible(&forest, 3, 3), false);
+        });
+    }
+
+    #[test]
+    fn it_counts_visible_trees() {
+        with_input(|forest| assert_eq!(count_visible_trees(forest), 21));
+    }
+
+    #[test]
+    fn it_solves_part1() {
+        let forest = input(INPUT);
+        assert_eq!(count_visible_trees(forest), 1533);
+    }
+
+    #[test]
+    fn it_counts_sightlines() {
+        with_input(|forest| assert_eq!(scenic_score(forest, 1, 2), 4));
+    }
+}

2022/src/main.rs

@@ -5,6 +5,8 @@ mod day4;
 mod day5;
 mod day6;
 mod day7;
+mod day8;
+mod matrix;
 
 fn main() {
     let day = std::env::args().skip(1).next();
@@ -24,6 +26,8 @@ fn main() {
         Some("6b") => day6::part2(),
         Some("7a") => day7::part1(),
         Some("7b") => day7::part2(),
+        Some("8a") => day8::part1(),
+        Some("8b") => day8::part2(),
         _ => panic!("unrecognized day"),
     };
 

2022/src/matrix.rs

@@ -0,0 +1,73 @@
+use std::fmt::Debug;
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct Matrix<T> {
+    pub rows: usize,
+    pub cols: usize,
+    pub data: Vec<Vec<T>>,
+}
+
+impl<T: Clone + Copy + Debug> Matrix<T> {
+    pub fn new(data: Vec<Vec<T>>) -> Self {
+        let rows = data.len();
+        let cols = data
+            .iter()
+            .fold(0, |max, row| std::cmp::max(max, row.len()));
+        Self { rows, cols, data }
+    }
+
+    pub fn row(&self, row_idx: usize) -> Vec<T> {
+        self.data[row_idx].clone()
+    }
+
+    pub fn col(&self, col_idx: usize) -> Vec<T> {
+        let mut col = Vec::new();
+        (0..self.rows).for_each(|row_idx| {
+            col.push(self.data[row_idx][col_idx]);
+        });
+        col
+    }
+
+    pub fn rotate_cw(self) -> Self {
+        let mut data = Vec::new();
+        for col_idx in 0..self.cols {
+            let mut row = vec![];
+            for row_idx in 0..self.rows {
+                row.push(self.data[self.rows - row_idx - 1][col_idx]);
+            }
+            data.push(row);
+        }
+
+        Self {
+            rows: self.cols,
+            cols: self.rows,
+            data,
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn it_can_rotate_symmetrix_matrix() {
+        let matrix = Matrix::new(vec![vec!['A', 'B'], vec!['C', 'D']]);
+        let expected = Matrix::new(vec![vec!['C', 'A'], vec!['D', 'B']]);
+        assert_eq!(matrix.rotate_cw(), expected);
+    }
+
+    #[test]
+    fn it_can_rotate_asymmetric_matrix() {
+        let matrix = Matrix::new(vec![
+            vec![Some('A'), Some('B'), Some('C')],
+            vec![Some('D'), Some('E'), Some('F')],
+        ]);
+        let expected = Matrix::new(vec![
+            vec![Some('D'), Some('A')],
+            vec![Some('E'), Some('B')],
+            vec![Some('F'), Some('C')],
+        ]);
+        assert_eq!(matrix.rotate_cw(), expected);
+    }
+}

2023/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc-2023"
+version = "0.1.0"

2023/Cargo.toml

@@ -0,0 +1,8 @@
+[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]

2023/src/day1.rs

@@ -0,0 +1,180 @@
+use std::collections::HashMap;
+
+const INPUT: &str = include_str!("../data/day1.txt");
+
+pub fn day1a() -> String {
+    format!("{}", get_calibration(INPUT, calibration_line))
+}
+
+pub fn day1b() -> String {
+    format!("{}", get_calibration(INPUT, calibration_line_2))
+}
+
+pub(crate) fn get_calibration<F>(data: &str, parser: F) -> u32
+where
+    F: Fn(&str) -> u32,
+{
+    data.lines().map(parser).fold(0, |acc, val| acc + val)
+}
+
+pub(crate) fn calibration_line(data: &str) -> u32 {
+    let chars = data
+        .chars()
+        .filter(|c| c.is_digit(10))
+        .collect::<Vec<char>>();
+    let number_as_str = format!("{}{}", chars[0], chars[chars.len() - 1]);
+    number_as_str.parse::<u32>().unwrap()
+}
+
+pub(crate) fn calibration_line_2(data: &str) -> u32 {
+    let data = interpret_text(data);
+    calibration_line(&data)
+}
+
+const NAMES: [(&str, &str); 20] = [
+    ("zero", "0"),
+    ("one", "1"),
+    ("two", "2"),
+    ("three", "3"),
+    ("four", "4"),
+    ("five", "5"),
+    ("six", "6"),
+    ("seven", "7"),
+    ("eight", "8"),
+    ("nine", "9"),
+    ("0", "0"),
+    ("1", "1"),
+    ("2", "2"),
+    ("3", "3"),
+    ("4", "4"),
+    ("5", "5"),
+    ("6", "6"),
+    ("7", "7"),
+    ("8", "8"),
+    ("9", "9"),
+];
+
+fn interpret_text(data: &str) -> String {
+    let mut working = data.to_owned();
+    let mut digits = Vec::new();
+
+    while let Some((idx, digit)) = find_digit(&working) {
+        let _ = working.drain(..(idx + 1)).collect::<String>();
+        digits.push(digit);
+    }
+    /*
+    while let Some((idx, digit)) = find_digit(working.drain(..next_idx).collect()) {
+        next_idx = idx;
+        digits.push(digit);
+    }
+    */
+
+    println!("interpretation {} -> {}", data, digits.join(""));
+    digits.join("")
+}
+
+fn find_digit(data: &str) -> Option<(usize, String)> {
+    let mut lowest_idx = 999;
+    let mut first_value = None;
+
+    for (name, value) in NAMES {
+        if let Some(idx) = data.find(name) {
+            if idx < lowest_idx {
+                lowest_idx = idx;
+                first_value = Some(value.to_owned());
+            }
+        }
+    }
+
+    first_value.map(|v| (lowest_idx, v))
+}
+
+/*
+fn replace_first(data: String) -> (bool, String) {
+    let names_hash = HashMap::from(NAMES);
+    let mut lowest_idx = 999;
+    let mut first_name = None;
+
+    for (name, _) in NAMES {
+        if let Some(idx) = data.find(name) {
+            if idx < lowest_idx {
+                lowest_idx = idx;
+                first_name = Some(name);
+            }
+        }
+    }
+
+    if let Some(name) = first_name {
+        return (true, data.replace(name, names_hash[name]));
+    }
+    return (false, data);
+}
+*/
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    const TEST_DATA1: &str = "1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet";
+
+    const TEST_DATA2: &str = "two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen";
+
+    #[test]
+    fn test_1a() {
+        let test_cases = vec![
+            ("1abc2", 12, "1abc2"),
+            ("pqr3stu8vwx", 38, "pqr3stu8vwx"),
+            ("a1b2c3d4e5f", 15, "a1b2c3d4e5f"),
+            ("treb7uchet", 77, "treb7uchet"),
+        ];
+        for (input, expected, message) in test_cases {
+            assert_eq!(calibration_line(input), expected, "{}", message);
+        }
+
+        assert_eq!(get_calibration(TEST_DATA1, calibration_line), 142);
+    }
+
+    #[test]
+    fn test_1b() {
+        let test_cases = vec![
+            ("two1nine", 29, "two1nine"),
+            ("eightwothree", 83, "eightwothree"),
+            ("abcone2threexyz", 13, "abcone2threexyz"),
+            ("xtwone3four", 24, "xtwone3four"),
+            ("4nineeightseven2", 42, "4nineeightseven2"),
+            ("zoneight234", 14, "zoneight234"),
+            ("7pqrstsixteen", 76, "7pqrstsixteen,"),
+        ];
+        for (input, expected, message) in test_cases {
+            assert_eq!(calibration_line_2(input), expected, "{}", message);
+        }
+
+        assert_eq!(get_calibration(TEST_DATA2, calibration_line_2), 281);
+    }
+
+    #[test]
+    fn test_interpret_text() {
+        let test_cases = vec![
+            ("two1nine", "219", "two1nine"),
+            ("eightwothree", "823", "eightwothree"),
+            ("abcone2threexyz", "123", "abcone2threexyz"),
+            ("xtwone3four", "2134", "xtwone3four"),
+            ("4nineeightseven2", "49872", "4nineeightseven2"),
+            ("zoneight234", "18234", "zoneight234"),
+            ("7pqrstsixteen", "76", "7pqrstsixteen,"),
+        ];
+
+        for (input, expected, message) in test_cases {
+            assert_eq!(interpret_text(input), expected, "{}", message);
+        }
+    }
+}

2023/src/main.rs

@@ -0,0 +1,13 @@
+mod day1;
+
+fn main() {
+    let day = std::env::args().skip(1).next();
+
+    let result = match day.as_ref().map(|v| v.as_ref()) {
+        Some("1a") => day1::day1a(),
+        Some("1b") => day1::day1b(),
+        _ => panic!("unrecognized day"),
+    };
+
+    println!("[{}] {}", day.unwrap(), result);
+}

flake.lock

@@ -1,70 +1,23 @@
 {
   "nodes": {
-    "flake-utils": {
-      "locked": {
-        "lastModified": 1659877975,
-        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1669764884,
-        "narHash": "sha256-1qWR/5+WtqxSedrFbUbM3zPMO7Ec2CGWaxtK4z4DdvY=",
+        "lastModified": 1700794826,
+        "narHash": "sha256-RyJTnTNKhO0yqRpDISk03I/4A67/dp96YRxc86YOPgU=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "0244e143dc943bcf661fdaf581f01eb0f5000fcf",
+        "rev": "5a09cb4b393d58f9ed0d9ca1555016a8543c2ac8",
         "type": "github"
       },
       "original": {
         "id": "nixpkgs",
-        "ref": "nixos-22.05",
+        "ref": "nixos-unstable",
         "type": "indirect"
       }
     },
-    "nixpkgs_2": {
-      "locked": {
-        "lastModified": 1665296151,
-        "narHash": "sha256-uOB0oxqxN9K7XGF1hcnY+PQnlQJ+3bP2vCn/+Ru/bbc=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "14ccaaedd95a488dd7ae142757884d8e125b3363",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "oxalica": {
-      "inputs": {
-        "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs_2"
-      },
-      "locked": {
-        "narHash": "sha256-/ar+cbAKAxd2Ng9b7EhrIMz9CP353RbmLecvyOidyUM=",
-        "type": "tarball",
-        "url": "https://github.com/oxalica/rust-overlay/archive/master.tar.gz"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://github.com/oxalica/rust-overlay/archive/master.tar.gz"
-      }
-    },
     "root": {
       "inputs": {
-        "nixpkgs": "nixpkgs",
-        "oxalica": "oxalica"
+        "nixpkgs": "nixpkgs"
       }
     }
   },

flake.nix

@@ -2,11 +2,10 @@
   description = "Advent of Code";
 
   inputs = {
-    nixpkgs.url = "nixpkgs/nixos-22.05";
-    oxalica.url = "https://github.com/oxalica/rust-overlay/archive/master.tar.gz";
+    nixpkgs.url = "nixpkgs/nixos-unstable";
   };
 
-  outputs = { self, nixpkgs, oxalica }:
+  outputs = { self, nixpkgs }:
     let 
       version = builtins.string 0 8 self.lastModifiedDate;
       supportedSystems = [ "x86_64-linux" ];
@@ -14,18 +13,14 @@
     {
       devShell."x86_64-linux" =
         let
-          rust_overlay = import oxalica;
-          pkgs = import nixpkgs { system = "x86_64-linux"; overlays = [ rust_overlay ]; };
-          rust = pkgs.rust-bin.stable."1.65.0".default.override {
-            extensions = [ "rust-src" ];
-          };
+          pkgs = import nixpkgs { system = "x86_64-linux"; };
         in
         pkgs.mkShell {
           name = "aoc-devshell";
           buildInputs = [
-            pkgs.pkg-config
-            pkgs.openssl
-            rust
+            # pkgs.pkg-config
+            # pkgs.openssl
+            pkgs.rustup
           ];
         };
     };

rust-toolchain

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "1.73.0"
+targets = [ "wasm32-unknown-unknown" ]