From 2838eb5a25c39e8bd51b18b90b4d58cc339a7074 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20M=C3=BCller?= <stefan.muller@ubisoft.com>
Date: Thu, 2 Jul 2026 22:13:23 +0200
Subject: [PATCH] Remove &self from printing department solver methods

---
 src/solvers/printing_department.rs | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/src/solvers/printing_department.rs b/src/solvers/printing_department.rs
index 8480850..767ab8a 100644
--- a/src/solvers/printing_department.rs
+++ b/src/solvers/printing_department.rs
@@ -9,7 +9,7 @@ impl PrintingDepartment {
     const PAPER_ROLL_CHAR: char = '@';
     const MAX_NEIGHBORS_ACCESSIBLE: u8 = 3;
 
-    fn init_paper_roll_grid<R: BufRead>(&self, reader: R) -> Grid<Option<u8>> {
+    fn init_paper_roll_grid<R: BufRead>(reader: R) -> Grid<Option<u8>> {
         let mut grid = Grid::new(0, 0);
         for line in reader.lines().map_while(Result::ok) {
             grid.push_row(
@@ -21,7 +21,7 @@ impl PrintingDepartment {
         grid
     }
 
-    fn count_neighbors(&self, grid: &mut Grid<Option<u8>>) -> Vec<Point2> {
+    fn count_neighbors(grid: &mut Grid<Option<u8>>) -> Vec<Point2> {
         let mut removables = Vec::new();
         let mut location = Point2(0, 0);
         // Loops over the grid.
@@ -54,11 +54,7 @@ impl PrintingDepartment {
         removables
     }
 
-    fn count_removable_paper_rolls(
-        &self,
-        mut grid: Grid<Option<u8>>,
-        mut removables: Vec<Point2>,
-    ) -> u64 {
+    fn count_removable_paper_rolls(mut grid: Grid<Option<u8>>, mut removables: Vec<Point2>) -> u64 {
         // Considers everything in "removables" as already counted.
         let mut result = removables.len() as u64;
         while let Some(current) = removables.pop() {
@@ -86,9 +82,9 @@ impl Solver for PrintingDepartment {
     const PUZZLE_NAME: &'static str = "Printing Department";
 
     fn process_data<R: BufRead>(&self, reader: R) -> (u64, u64) {
-        let mut grid = self.init_paper_roll_grid(reader);
-        let removables = self.count_neighbors(&mut grid);
+        let mut grid = Self::init_paper_roll_grid(reader);
+        let removables = Self::count_neighbors(&mut grid);
         let part1 = removables.len() as u64;
-        (part1, self.count_removable_paper_rolls(grid, removables))
+        (part1, Self::count_removable_paper_rolls(grid, removables))
     }
 }