y2024d4

Cargo.lock

@@ -121,4 +121,5 @@ name = "y2024"
 version = "0.1.0"
 dependencies = [
  "regex",
+ "utils",
 ]

y2024/Cargo.toml

@@ -5,3 +5,4 @@ edition = "2021"
 
 [dependencies]
 regex = "1.11.1"
+utils = { workspace = true }

y2024/resources/4_input.txt

@@ -0,0 +1,140 @@
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y2024/src/bin/d4.rs

@@ -0,0 +1,20 @@
+use std::fs;
+
+use y2024::days::d4;
+
+fn main() {
+    part1();
+    part2();
+}
+
+fn part1() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/4_input.txt")).unwrap();
+    println!("{}", d4::process_part1(&content));
+}
+
+fn part2() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/4_input.txt")).unwrap();
+    println!("{}", d4::process_part2(&content));
+}

y2024/src/days/d4.rs

@@ -0,0 +1,164 @@
+use std::cmp;
+
+use utils::grid::Grid;
+
+pub fn process_part1(input: &str) -> i32 {
+    let grid = input
+        .lines()
+        .map(|line| {
+            line.chars()
+                .map(|char| char.to_string())
+                .collect::<Vec<String>>()
+        })
+        .collect::<Vec<Vec<String>>>();
+    let mut grid = Grid::new(grid).unwrap();
+    let mut res = 0;
+    for row in &grid.rows {
+        let row = row.join("");
+        res += row.matches("XMAS").count();
+        res += row.matches("SAMX").count();
+    }
+    for diag_grave in grid.get_diagonals_grave() {
+        let diag_grave = diag_grave.join("");
+        res += diag_grave.matches("XMAS").count();
+        res += diag_grave.matches("SAMX").count();
+    }
+    for diag_aigu in grid.get_diagonals_aigu() {
+        let diag_aigu = diag_aigu.join("");
+        res += diag_aigu.matches("XMAS").count();
+        res += diag_aigu.matches("SAMX").count();
+    }
+    for col in grid.rotate_90().rows {
+        let col = col.join("");
+        res += col.matches("XMAS").count();
+        res += col.matches("SAMX").count();
+    }
+    res.try_into().unwrap()
+}
+
+pub fn process_part2(input: &str) -> i32 {
+    let grid = input
+        .lines()
+        .map(|line| {
+            line.chars()
+                .map(|char| char.to_string())
+                .collect::<Vec<String>>()
+        })
+        .collect::<Vec<Vec<String>>>();
+    let grid = Grid::new(grid).unwrap();
+    let mut res = 0;
+    // Irrelevant as this finds + not x
+    // But actually helpful as I can just create diagonals, left and right pad to create a square
+    // grid and apply this
+    //for (row_idx, row) in grid.rows.iter().enumerate() {
+    //    if row_idx == 0 || row_idx == grid.rows.len() - 1 {
+    //        continue;
+    //    }
+    //    let row = row.join("");
+    //    for (match_idx, _) in row.match_indices("MAS") {
+    //        let above = grid.rows[row_idx - 1][match_idx + 1].clone();
+    //        let below = grid.rows[row_idx + 1][match_idx + 1].clone();
+    //        if (above == "M" && below == "S") || (above == "S" && below == "M") {
+    //            res += 1;
+    //        }
+    //    }
+    //    for (match_idx, _) in row.match_indices("SAM") {
+    //        let above = grid.rows[row_idx - 1][match_idx + 1].clone();
+    //        let below = grid.rows[row_idx + 1][match_idx + 1].clone();
+    //        if (above == "M" && below == "S") || (above == "S" && below == "M") {
+    //            res += 1;
+    //        }
+    //    }
+    //}
+    let diagonals = grid.get_diagonals_grave();
+    // new width is as long as the longest diagonal
+    // the diagonal length goes from 1..min(grid width, grid height)
+    // then pad on each side by difference / 2
+    let new_width = cmp::min(grid.width as usize, grid.rows.len());
+    let mut even_grid = Vec::new();
+    let mut odd_grid = Vec::new();
+    for diagonal in diagonals {
+        let diagonal_length = diagonal.len();
+        let pad = (new_width - diagonal_length) / 2;
+        let new_row = [
+            vec!["#".to_string(); pad],
+            diagonal,
+            vec!["#".to_string(); pad],
+        ]
+        .concat();
+        if diagonal_length % 2 == 0 {
+            even_grid.push(new_row);
+        } else {
+            odd_grid.push(new_row);
+        }
+    }
+    for (row_idx, row) in even_grid.iter().enumerate() {
+        if row_idx == 0 || row_idx == even_grid.len() - 1 {
+            continue;
+        }
+        let row = row.join("");
+        for (match_idx, _) in row.match_indices("MAS") {
+            let above = even_grid[row_idx - 1][match_idx + 1].clone();
+            let below = even_grid[row_idx + 1][match_idx + 1].clone();
+            if (above == "M" && below == "S") || (above == "S" && below == "M") {
+                res += 1;
+            }
+        }
+        for (match_idx, _) in row.match_indices("SAM") {
+            let above = even_grid[row_idx - 1][match_idx + 1].clone();
+            let below = even_grid[row_idx + 1][match_idx + 1].clone();
+            if (above == "M" && below == "S") || (above == "S" && below == "M") {
+                res += 1;
+            }
+        }
+    }
+    for (row_idx, row) in odd_grid.iter().enumerate() {
+        if row_idx == 0 || row_idx == odd_grid.len() - 1 {
+            continue;
+        }
+        let row = row.join("");
+        for (match_idx, _) in row.match_indices("MAS") {
+            let above = odd_grid[row_idx - 1][match_idx + 1].clone();
+            let below = odd_grid[row_idx + 1][match_idx + 1].clone();
+            if (above == "M" && below == "S") || (above == "S" && below == "M") {
+                res += 1;
+            }
+        }
+        for (match_idx, _) in row.match_indices("SAM") {
+            let above = odd_grid[row_idx - 1][match_idx + 1].clone();
+            let below = odd_grid[row_idx + 1][match_idx + 1].clone();
+            if (above == "M" && below == "S") || (above == "S" && below == "M") {
+                res += 1;
+            }
+        }
+    }
+    res
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const INPUT: &str = "MMMSXXMASM
+MSAMXMSMSA
+AMXSXMAAMM
+MSAMASMSMX
+XMASAMXAMM
+XXAMMXXAMA
+SMSMSASXSS
+SAXAMASAAA
+MAMMMXMMMM
+MXMXAXMASX";
+
+    #[test]
+    fn part1() {
+        let result = process_part1(INPUT);
+        assert_eq!(result, 18);
+    }
+
+    #[test]
+    fn part2() {
+        let result = process_part2(INPUT);
+        assert_eq!(result, 9);
+    }
+}

y2024/src/days/mod.rs

@@ -3,3 +3,5 @@ pub mod d1;
 pub mod d2;
 
 pub mod d3;
+
+pub mod d4;