Day 4 solution!

2024-12-04 22:14:14 -05:00 · 2024-12-04 22:14:14 -05:00 · b2dcf20a27
parent c170aee068
commit b2dcf20a27
4 changed files with 381 additions and 5 deletions
--- a/2024/data/day4.txt
+++ b/2024/data/day4.txt
@ -0,0 +1,140 @@
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+XAAMAMMMMMMMMXMAMMMMMXSSSSSMXSAMXSAMXMMSSMAXSMMAXMAMXMASMSMSAMXSAAMAMAMAMAMXMXMAAMAMMMMMXMAXAMMMAAAASMSMSMMSSMMASXSASAMAXAMMMMSAMMXAXAXMAMMS
+SSXMASAMXASMSMSAMMSMAMSAMAAAASAMMSAMXSMAAMXMXAMSXMAMAMAMXAASXMSXMXMAMXMASMSSSXSMMSXMXMXMSAMXMSMSSSMMXAAXXSAAAASXMASASXXXSMMAXAMAMAMAMMMMSMXM
+XMMSMMMAXMXAAMMAMMAMASMAMSMMMSAMMSAMMAMXMMAMXXMAASAMSSMMAMXMMXMAMXSXSAMXAXAAXAMAMXXXXMXMXMMMXAAMAMXSMSMXMMMSSMMSMXMAMMXMAXXXMASMMSMMSASMMSAA
+SMMAAXXSSMMSMXMAMSAXXXXMMXAAXSMMAMSAMXMAXXASMMSMMSASAMXSXXXXAAMAMAAXAMMMMMMMMXMASMSSMMSAMXAMXMSMSMAXXXXAXAMAAMSASXMSMAMMASMXMXMMAXAASASMASMS
+XASXSMAXAAXXMXAMMSASMSAMXMAMXMAMMXMMSAMMMSASMAAXXMMAMXAAAXMASMSXSMSSSMAAXXAXXXSMSAXMAAAMASAXSAXAMMMSMMSXSAMSSMSASXMAMMSMAMAAXAAMAMMMMAMMASMA
+SAMXAMXMXMMAMXSMAXXAASMMSSXMAMMAMAMXMAAAMAMXMMSSXSMMMXXMXMAMXXSASAAAASMSSSMXSAMXMMMSMMXXMSAXMAMMMAMAAXAMMXMAAAMAMXMASMXMASMXSXXMASMSMSMMAMMM
+AAMSXMAMASMMMAMMXMMSAMXAASASXSAASXSXSSMSSXSXMMXMAAMASAMXMASMMAMAMMMSMMXXAXMASAMXAXAAXXXSMMMMMMMASASXMMASMMMSMXMSMAXASAAXASMXSMXXMAXAXAXMMSMX
+SAMAMSASASAAMSSXMXXMSSMSSSXMASMMMXAXXXMXXXMASAMMMMSAMMAAXAAMMSMXMXAAAXMMAMMASAMSSSSMSSXSAMXAAASXSAMXASAMXAAAXAAXMMMXSMSMAMMASMXSMMSXMMXSAAXM
+MMAMXMAMASXMMAMASXSMAMAMAMMMXMASXMMMMASAMXSAMMSAAXMASXSMSSXSAAMAMMSSMMMMSMMAXAMAAXXXAXXMAASXSMSAMXSAMMASXSSMSMSMAAAMMAXMAMMAXMAMAAAMSMAMMMSA
+XASXSMSMMMMSMMSAMSMMASMMAMSAMXXMXMXAMAMMSAMXSXMXMXAXAMXAMXAMMSXXSAXAXAAAMXMSMMMMSMMMXSMSSMAMMMMXMAAAXSAMXAAXXXAMSXSAMAMMSSMMMMAMXMSAAMASXXXM
+MXMASXXASAAXAAMAMAXMASAXXMXMASXXAASMXSSMMXMAXMMMSMMXSAMXSMXMXMMXMXSAMSMSSSXMAXAAAAAXXSAAAMXSAAXAMXXMMMAXMSMMASXXXMAXMASXAXAAAMMSXMXXXSASXMMM
+AAMXMMSAMMXSSMSSMAMSASMMSSMSAMXSXMMMAXAMXSMASASAAAAMMAAMAMXMAXMXSXMAMXAAXMASMSMSSSMSASMSMMASMSMSMMMSXSMXMAMXXXMASMMXAAMMMMMSXSAAMSASXMASAXAA
+SXMASXMMMXXMAAAAMAMMAMXMMAAMMSAMMAAMSSMMAXMXSAMSSMSMSASXMSXMAMSAMXSXMASMXMASAAMAAAAMAXXAXMXSAXAXMASAAASMXSAMSAMMMAXXMAMAAAAAAMMMSMASAMXMMXXM
+MASASASXXXAMMMMMXAAMSMMSAMXMAMAXSMXMMAAMXSMAMAMAMAAASAXMXSXMMXMAXAMASAXAXMAMMSMMXMXMXMSASXAXAMXMSMSMSMSXAXAXSASMSMMMSXSSSMSSSMSXSMSMMMSSXSSS
+SAMASXMMMSMMAAXXMMXXAAXMAXAMXSXMMXMMSSMMSAMASAXAMSMXMMXMAMAMXASMSMSMMSSMXMAMXAMMSSMSAAMASMMMXMAMAAXAAAXMASMMSAMXAMAXSMMMAAAMMMXAXXMAMAAXXAAS
+MAMMMMSMAAXXSMSXAXMSSSMMMMXSAMXMMAMXAXAXXASAXXSXXXXMAXAMASAMXMMMAAXAAAXASXMSSMSASXASMSMAXAASMMXSMSMSMSMMAAAMMMMSXMSXMASXMMMMSXMXMXMAMMSSMMXM
+SXMAAAAMXSSMXASMMAMXMMAAAASMMMAAMASMAMXXSXMXSAMXMASXXSMSASASMSSSMMMMMMSMXASAXAMXMMXMXXMXSAMXASAMXMAXXXXMASAMAXMAMXMXXAMASXSAMXSMMSSMMAAXASXS
+MXSSMXXSXAXAMAXAMSASMSSMMMXAAXMMMMSMAMXAXAAASAMASMMSMAMMXSASAMMAAXXXAXMASMMMXMASMMAMXXSAMXSXMAMMMMXMASMSAXXSXSMMASMSMASXMAAXMXAAMAAAMMMXXMAA
+SAMXSXASMMMXMAMSMAAMMAXAXMMSMSSXMSSXSXSASMXMXASMXMAAXAMXAMMMAMSSMMXMMSAMXXAXMSXMASASMXMASAMAMMSAXMAMMMAMASAMXMAMSAAXMAMMMSMMSMMAMSSMMASMSMXM
+MASAMMMMAAAXXMAMXMXMMAMXMMMMAAAAXAXAMAAASXAMSMMMMMSSSSSMXSSSSMXAMXAAAMXXMSMMASASXSASAXSAMXSXMASMMSASASMMAMAMAXXMMMMMSASAAMXAAAXMMXMASASAMXAX
+MMMAMAAMXMSSMSMXMMAMMMXAAXAMMMSMMMMSMSMMMXSMMAASAAXAAAMAMXAAXXXMASXSXSSMMASXMSAMAMAMXAMASXSXMXSXASASASXMXSXMMSSMXAMASASMASMSSSMXXAMXMMMAMSXS
+SSSMSSSSXAXMMAMAASXSAAMSMMMSMXAAAXAAMASMXXMASMMSMMSAMSMSSMMMMMSMMAXMASAMSAMXXMAMAMXMSXMASMMMSAMMAMXMXMMAMXAMAAMASMMAMAMMXXAAXAMXSXMSXSXSMSMA
+XMAAAAAMMMMMSASXXAMMMSMMAXXAXMSXMMSSSMAMXMMAMXXXXXMXXAAXAAXXAAAAMSAMXMAMMASMMSXSASAMMASAXAAAMSMMSXSAMXXMXSXMMSSMSAMXSMXMMMMMSSMXXMXSAMAMASAM
+XSMMMSMAAMAASXSMSMMAXMAXSMSMSXXAMAAXAXMSMSMSSMMXSSSMSMXMMSMSMSSSMXXMMSXMSAMAXAASASMXSAMXSSMXSASXAAXXAMAMXMSXXAXXXMMXXAAMASXAAAMMMMAMAMSMAMSA
+ASASXXMSSSMMSASAAXXAMSMMMXMXSAMAMMSXMMXAAAMMAMXXXAAMXSAAXAAAAAXAMXASAMXMMSSSMMMMXMXMMAMXXMAMSAMMMMMMAMASAAAMMMXSXMSSMSMSSSMMMMSAAMMSMMMMAMMM
+XSAMXMAAAMXXMAMMMSASMXMASAAAXXMXMXXMAASMSMSSSMAAMSMMAMMXSMSMSMSMMXMMXSXMAMMAMXMMXSAMSSMMMMXMMAMXAXASXSASMSMSXMASMMAXAMAXAXMAMAMXXSMMAAMSSSMS
+MMMMMMMMSMXMMXMASXAXAAMASXMAXSAMXAMXXMXAXMMAMXXSMXAMXMXAXXAXAXMASXSXMAXMAXSAMXSAXXAMAXAAAAAMSXSSMSMXXMXXAAXMAMXSAMASXMMMAMSAMXMAMSASMMMAAAAS
+XMAMAAXMAMXXAAMXMMMMSXMASAXMASMSMXSSSSMXMXMAMXAXXSXMMXSAMMSXMSMASXAXAASXMMAASAMXSSSMSSSSSSMXAAAAMAXMSMSMSMSSXMASMMASXAXAXASMXSAMXSAMXMMMSMMM
+MSSSSSSXSXSXSMSAMAXAMAMXSMMSMMXMMMAXAAASMSSSSMMMMXAXMAXAAMAASMMASXSXMASAAMSMMMMAXXXAAAXXAAXMASMMXMSXAAAAAAXMSMMSXMXMMAMSMMMSASXSAMXMAMXAMMMS
+MMMAXAMAMAMXMAMXXAXSMSMAMXAXASMAAMXMMMMXAAAMXAAMMSAXMASMSMSSMAMAXMAASASMMMAAXSMSSMMMMSMXSMMMAMMSAMMMMSMMMXMAASAMXSMMMSAAXAAAMSAXXXASASMMMAAA
+SAMXMMMAMAMMSAMSMSXMAAMMAMXSAMASMSAMSMSMMMSMXSMSAMXMSAXXAAMAMAMXXASAMAMMMXMSMXXMAXAAXMXMMXMMXMASMSAMXAAMSSMSMSMSAMAAAMSSSMSXAMMMSMASAMMASMSS
+XSMXAXAAXXMAMAMXAMAMXMMXAAXMAMXMXSMSAAAXXMXXAAXMMSXMASXSMSMASMMMSMMMMSMSAASAMXSSMMSSSXMAXASXMMAMXMMMMMSMAAXXAMAMMSSMXXAXXXXMMXSAAMAMAXSMSMAA
+SXXSAMMXXXMAMAMMAMXMSXMXAMXXAMMXASXSMSMXXSAMSSMMXMXMAMXMAMMMMXMAAXXAAXMMXMXAMAMAMAXAXMASMMMAASAMSMMSSMAMMSASAMXMAXMMSMMMSSXAXAMMMMXMMXMAXXMX
+AXAAAMAASMSASXSMAMAMAASXSMMSASAMXSAXAMMSMMMMMAXMAMAMMMAMAMMMASMSMSSMSSMAMSSSMASXMSMSMMAXXMMMMMAXSAAAAXMSXXASXMAXMMMAASASAMXMMMSMSSMMSSMAMMXM
+MMMMSMXXSAAAAAXXASASXXMAMAASXMASMMMMSMAAAASASMMSASASMSSMASXMAMAAXMASAXMAMXAASAMXAXAAAMSSSMAXXSXMSMMSSMXAAMAMXSXSXAMSSSSMASAXAMAXAAAAAAAMSAAA
+XXXXMAMXMAMSMAMSXSMSXMMAMMMMXXMAMAXXXMSSSMSMSXMSASMSMXMAXSAMMSSMSSMMSSSMSMSMMSAMXMSMSMMAASXSAMXMXXMAXXSMSMSMMXXSMSXXAMXMASASMSSSSSMMSSMXAXSS
--- a/2024/src/day3.rs
+++ b/2024/src/day3.rs
@ -1,5 +1,9 @@
 use nom::{
-    branch::alt, bytes::complete::{tag, take_while}, character::{complete::anychar, is_digit}, combinator::eof, multi::{many1, many_till}, Err, Finish, IResult
+    branch::alt,
+    bytes::complete::{tag, take_while},
+    character::{complete::anychar, is_digit},
+    multi::{many1, many_till},
+    Finish, IResult,
 };
 use regex::Regex;

@ -119,10 +123,13 @@ fn match_mult(input: &str) -> IResult<&str, Operation> {
    let (rest, y) = take_while(|c| is_digit(c as u8))(rest)?;
    let (rest, _) = tag(")")(rest)?;

-    Ok((rest, Operation::Mult(Multiplication {
-        x: x.parse::<i32>().unwrap(),
-        y: y.parse::<i32>().unwrap(),
-    })))
+    Ok((
+        rest,
+        Operation::Mult(Multiplication {
+            x: x.parse::<i32>().unwrap(),
+            y: y.parse::<i32>().unwrap(),
+        }),
+    ))
 }

 #[cfg(test)]
--- a/2024/src/day4.rs
+++ b/2024/src/day4.rs
@ -0,0 +1,226 @@
+const INPUT: &'static str = include_str!("../data/day4.txt");
+
+pub fn day4a() -> String {
+    let grid = Grid::from(INPUT);
+    format!("{}", find_xmas(&grid))
+}
+
+pub fn day4b() -> String {
+    let grid = Grid::from(INPUT);
+    format!("{}", find_x_mas(&grid))
+}
+
+struct Grid {
+    width: usize,
+    height: usize,
+    data: Vec<char>,
+}
+
+impl Grid {
+    fn elem(&self, x: usize, y: usize) -> char {
+        if y >= self.height || x >= self.width {
+            panic!("out of range")
+        }
+        self.data[y * self.width + x]
+    }
+}
+
+impl From<&str> for Grid {
+    fn from(input: &str) -> Self {
+        let height = input.lines().count();
+
+        let first_row = input.lines().next().unwrap();
+        let width = first_row.len();
+
+        let data = input.chars().filter(|c| *c != '\n').collect::<Vec<char>>();
+
+        Self {
+            width,
+            height,
+            data,
+        }
+    }
+}
+
+#[derive(Copy, Clone)]
+enum Direction {
+    East,
+    SouthEast,
+    South,
+    SouthWest,
+    West,
+    NorthWest,
+    North,
+    NorthEast,
+}
+
+fn find_xmas(grid: &Grid) -> usize {
+    let mut acc = 0;
+    for x in 0..grid.width {
+        for y in 0..grid.height {
+            if check_xmas(grid, x, y, Direction::East) {
+                acc += 1;
+            }
+            if check_xmas(grid, x, y, Direction::SouthEast) {
+                acc += 1;
+            }
+            if check_xmas(grid, x, y, Direction::South) {
+                acc += 1;
+            }
+            if check_xmas(grid, x, y, Direction::SouthWest) {
+                acc += 1;
+            }
+            if check_xmas(grid, x, y, Direction::West) {
+                acc += 1;
+            }
+            if check_xmas(grid, x, y, Direction::NorthWest) {
+                acc += 1;
+            }
+            if check_xmas(grid, x, y, Direction::North) {
+                acc += 1;
+            }
+            if check_xmas(grid, x, y, Direction::NorthEast) {
+                acc += 1;
+            }
+        }
+    }
+
+    acc
+}
+
+fn check_xmas(grid: &Grid, x: usize, y: usize, direction: Direction) -> bool {
+    let mut addr: Option<(usize, usize)> = Some((x, y));
+
+    for c in "XMAS".chars() {
+        if let Some((cx, cy)) = addr {
+            if grid.elem(cx, cy) == c {
+                addr = move_pointer(grid, cx, cy, direction);
+            } else {
+                return false;
+            }
+        } else {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+fn find_x_mas(grid: &Grid) -> usize {
+    let mut acc = 0;
+    for x in 1..grid.width - 1 {
+        for y in 1..grid.width - 1 {
+            if check_x_mas(grid, x, y) {
+                acc += 1;
+            }
+        }
+    }
+
+    acc
+}
+
+fn check_x_mas(grid: &Grid, x: usize, y: usize) -> bool {
+    if grid.elem(x, y) != 'A' {
+        return false;
+    }
+
+    let nw = move_pointer(&grid, x, y, Direction::NorthWest).map(|(cx, cy)| grid.elem(cx, cy));
+    let ne = move_pointer(&grid, x, y, Direction::NorthEast).map(|(cx, cy)| grid.elem(cx, cy));
+    let se = move_pointer(&grid, x, y, Direction::SouthEast).map(|(cx, cy)| grid.elem(cx, cy));
+    let sw = move_pointer(&grid, x, y, Direction::SouthWest).map(|(cx, cy)| grid.elem(cx, cy));
+
+    match (nw, ne, se, sw) {
+        (Some(nw), Some(ne), Some(se), Some(sw)) => {
+            // M . M
+            // . A .
+            // S . S
+            if nw == 'M' && se == 'S' && ne == 'M' && sw == 'S' {
+                return true;
+            };
+
+            // M . S
+            // . A .
+            // M . S
+            if nw == 'M' && se == 'S' && sw == 'M' && ne == 'S' {
+                return true;
+            };
+
+            // S . S
+            // . A .
+            // M . M
+            if sw == 'M' && ne == 'S' && se == 'M' && nw == 'S' {
+                return true;
+            };
+
+            // S . M
+            // . A .
+            // S . M
+            if se == 'M' && nw == 'S' && ne == 'M' && sw == 'S' {
+                return true;
+            };
+
+            false
+        }
+        _ => false,
+    }
+}
+
+fn move_pointer(grid: &Grid, x: usize, y: usize, direction: Direction) -> Option<(usize, usize)> {
+    match direction {
+        Direction::East if x < grid.width - 1 => Some((x + 1, y)),
+        Direction::SouthEast if x < grid.width - 1 && y < grid.height - 1 => Some((x + 1, y + 1)),
+        Direction::South if y < grid.height - 1 => Some((x, y + 1)),
+        Direction::SouthWest if x > 0 && y < grid.height - 1 => Some((x - 1, y + 1)),
+        Direction::West if x > 0 => Some((x - 1, y)),
+        Direction::NorthWest if x > 0 && y > 0 => Some((x - 1, y - 1)),
+        Direction::North if y > 0 => Some((x, y - 1)),
+        Direction::NorthEast if x < grid.width - 1 && y > 0 => Some((x + 1, y - 1)),
+        _ => None,
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    const TEST_INPUT: &'static str = "MMMSXXMASM
+MSAMXMSMSA
+AMXSXMAAMM
+MSAMASMSMX
+XMASAMXAMM
+XXAMMXXAMA
+SMSMSASXSS
+SAXAMASAAA
+MAMMMXMMMM
+MXMXAXMASX";
+
+    #[test]
+    fn it_finds_xmas() {
+        let grid = Grid::from(TEST_INPUT);
+        assert_eq!(find_xmas(&grid), 18);
+
+        let grid = Grid::from(INPUT);
+        assert_eq!(find_xmas(&grid), 2633);
+    }
+
+    #[test]
+    fn it_finds_x_mas() {
+        let grid = Grid::from(TEST_INPUT);
+        assert_eq!(find_x_mas(&grid), 9);
+
+        let grid = Grid::from(INPUT);
+        assert_eq!(find_x_mas(&grid), 1936);
+    }
+
+    #[test]
+    fn it_parses_the_grid() {
+        let grid = Grid::from(TEST_INPUT);
+        assert_eq!(grid.width, 10);
+        assert_eq!(grid.height, 10);
+        assert_eq!(grid.elem(9, 0), 'M');
+        assert_eq!(grid.elem(9, 1), 'A');
+        assert_eq!(grid.elem(9, 2), 'M');
+        assert_eq!(grid.elem(9, 3), 'X');
+        assert_eq!(grid.elem(9, 9), 'X');
+    }
+}
--- a/2024/src/main.rs
+++ b/2024/src/main.rs
@ -1,6 +1,7 @@
 mod day1;
 mod day2;
 mod day3;
+mod day4;

 fn main() {
    let day = std::env::args().skip(1).next();
@ -12,6 +13,8 @@ fn main() {
        Some("2b") => day2::day2b(),
        Some("3a") => day3::day3a(),
        Some("3b") => day3::day3b(),
+        Some("4a") => day4::day4a(),
+        Some("4b") => day4::day4b(),
        _ => panic!("unrecognized day"),
    };