Day 15

Today was chill, i loved it

lib/src/day14/mod.rs

@@ -16,17 +16,21 @@ impl Day14 {
     fn rotate(left: bool, array: &mut [[char; SIZE]; SIZE]) {
         let mut rot = [['.'; SIZE]; SIZE];
         match left {
-            false => for i in 0..SIZE {
+            false => {
+                for i in 0..SIZE {
                     for j in 0..SIZE {
                         rot[i][j] = array[SIZE - j - 1][i];
                     }
-            },
+                }
-            true => for i in 0..SIZE {
+            }
+            true => {
+                for i in 0..SIZE {
                     for j in 0..SIZE {
                         rot[i][j] = array[j][SIZE - i - 1];
                     }
                 }
             }
+        }
         *array = rot;
     }
 }
@@ -34,20 +38,27 @@ impl Day14 {
 impl Day for Day14 {
     fn part1(&mut self) -> String {
         let mut square_rocks = HashMap::<usize /* column index */, usize /* row index */>::new();
-        let mut new_dish = vec![vec![false; self.input.lines().next().unwrap().len()]; self.input.lines().count()];
+        let mut new_dish =
+            vec![vec![false; self.input.lines().next().unwrap().len()]; self.input.lines().count()];
         for (i, row) in self.input.lines().enumerate() {
             for (j, char) in row.chars().enumerate() {
                 match char {
                     '.' => continue,
-                    '#' => { square_rocks.insert(j, i); },
+                    '#' => {
+                        square_rocks.insert(j, i);
+                    }
                     'O' => {
                         let mut k = square_rocks.get(&j).map(|n| n + 1).unwrap_or(0);
                         loop {
-                            if new_dish[k][j] != true { new_dish[k][j] = true; break }
+                            if new_dish[k][j] != true {
-                            else { k += 1; }
+                                new_dish[k][j] = true;
+                                break;
+                            } else {
+                                k += 1;
                             }
-                    },
+                        }
-                    _ => panic!()
+                    }
+                    _ => panic!(),
                 }
             }
         }
@@ -62,16 +73,39 @@ impl Day for Day14 {
         //         .join("\n")
         // );
 
-        new_dish.into_iter().enumerate().map(|(i, line)| line.into_iter().filter_map(|rock| if rock { Some(SIZE - i) } else { None }).sum::<usize>()).sum::<usize>().to_string()
+        new_dish
+            .into_iter()
+            .enumerate()
+            .map(|(i, line)| {
+                line.into_iter()
+                    .filter_map(|rock| if rock { Some(SIZE - i) } else { None })
+                    .sum::<usize>()
+            })
+            .sum::<usize>()
+            .to_string()
     }
 
     fn part2(&mut self) -> String {
         let mut direction = 0u8; // 0 -> North, 1 -> East, 2 -> South, 3 -> West
-        let mut new_dish: [[char; SIZE]; SIZE] = self.input.lines().map(|line| line.chars().collect_vec().try_into().unwrap()).collect_vec().try_into().unwrap();
+        let mut new_dish: [[char; SIZE]; SIZE] = self
-        let mut cache = CLruCache::<(u8, [[char; SIZE]; SIZE]), [[char; SIZE]; SIZE]>::new(NonZeroUsize::new(100).unwrap());
+            .input
+            .lines()
+            .map(|line| line.chars().collect_vec().try_into().unwrap())
+            .collect_vec()
+            .try_into()
+            .unwrap();
+        let mut cache = CLruCache::<(u8, [[char; SIZE]; SIZE]), [[char; SIZE]; SIZE]>::new(
+            NonZeroUsize::new(100).unwrap(),
+        );
 
         for i in 0..390625u128 {
-            if i % 100000 == 0 { println!("{:.02}%, {}", i as f64 / 4000000000f64 * 100f64, cache.len()); }
+            if i % 100000 == 0 {
+                println!(
+                    "{:.02}%, {}",
+                    i as f64 / 4000000000f64 * 100f64,
+                    cache.len()
+                );
+            }
 
             // Cache check
             let cache_ref = new_dish.clone();
@@ -90,29 +124,36 @@ impl Day for Day14 {
                             row.reverse();
                         }
                         new_dish.reverse();
-                    },
+                    }
                     3 => Self::rotate(false, &mut new_dish),
-                    _ => panic!()
+                    _ => panic!(),
                 }
 
                 // Init tracking
-                let mut square_rocks = HashMap::<usize /* column index */, usize /* row index */>::new();
+                let mut square_rocks =
+                    HashMap::<usize /* column index */, usize /* row index */>::new();
                 let clone = new_dish.clone();
 
                 for (i, row) in clone.iter().enumerate() {
                     for (j, char) in row.iter().enumerate() {
                         match char {
                             '.' => continue,
-                            '#' => { square_rocks.insert(j, i); },
+                            '#' => {
+                                square_rocks.insert(j, i);
+                            }
                             'O' => {
                                 new_dish[i][j] = '.';
                                 let mut k = square_rocks.get(&j).map(|n| n + 1).unwrap_or(0);
                                 loop {
-                                    if new_dish[k][j] != 'O' { new_dish[k][j] = 'O'; break }
+                                    if new_dish[k][j] != 'O' {
-                                    else { k += 1; }
+                                        new_dish[k][j] = 'O';
+                                        break;
+                                    } else {
+                                        k += 1;
                                     }
-                            },
+                                }
-                            _ => panic!()
+                            }
+                            _ => panic!(),
                         }
                     }
                 }
@@ -127,19 +168,32 @@ impl Day for Day14 {
                             row.reverse();
                         }
                         new_dish.reverse();
-                    },
+                    }
                     3 => Self::rotate(true, &mut new_dish),
-                    _ => panic!()
+                    _ => panic!(),
                 }
 
                 // Loop direction
-                if direction != 0 { direction -= 1; } else { direction = 3; }
+                if direction != 0 {
+                    direction -= 1;
+                } else {
+                    direction = 3;
+                }
             }
 
             // Cache store
             cache.put((direction, cache_ref), new_dish);
         }
 
-        new_dish.into_iter().enumerate().map(|(i, line)| line.into_iter().filter_map(|rock| if rock == 'O' { Some(SIZE - i) } else { None }).sum::<usize>()).sum::<usize>().to_string()
+        new_dish
+            .into_iter()
+            .enumerate()
+            .map(|(i, line)| {
+                line.into_iter()
+                    .filter_map(|rock| if rock == 'O' { Some(SIZE - i) } else { None })
+                    .sum::<usize>()
+            })
+            .sum::<usize>()
+            .to_string()
     }
 }

lib/src/day15/mod.rs

@@ -0,0 +1,76 @@
+use std::collections::HashMap;
+
+use crate::utils::Day;
+
+#[derive(Debug, Default)]
+pub struct Day15 {
+    pub input: String,
+}
+
+impl Day for Day15 {
+    fn part1(&mut self) -> String {
+        let mut current = 0usize;
+
+        self.input
+            .split(',')
+            .map(|text| {
+                current = 0;
+
+                for c in text.chars() {
+                    current += c as usize;
+                    current *= 17;
+                    current %= 256;
+                }
+
+                current
+            })
+            .sum::<usize>()
+            .to_string()
+    }
+
+    fn part2(&mut self) -> String {
+        let mut map =
+            HashMap::<usize, Vec<(&str, u8)>>::from_iter((0..=255usize).map(|i| (i, vec![])));
+
+        for operation in self.input.split(',') {
+            let (label, focal_length) = operation.split_once(['-', '=']).unwrap();
+            let box_id = {
+                let mut current = 0;
+
+                for c in label.chars() {
+                    current += c as usize;
+                    current *= 17;
+                    current %= 256;
+                }
+
+                current
+            };
+            if focal_length == "" {
+                let lenses = map.get_mut(&box_id).unwrap();
+                if let Some(position) = lenses.iter().position(|(l, _)| l == &label) {
+                    lenses.remove(position);
+                }
+            } else {
+                let focal_length = focal_length.parse::<u8>().unwrap();
+
+                let lenses = map.get_mut(&box_id).unwrap();
+                match lenses.iter().position(|(l, _)| l == &label) {
+                    Some(position) => lenses[position].1 = focal_length,
+                    None => lenses.push((label, focal_length)),
+                }
+            }
+        }
+
+        (0..=255usize)
+            .map(|i| {
+                map.remove(&i)
+                    .unwrap()
+                    .into_iter()
+                    .enumerate()
+                    .map(|(j, (_, focal_length))| focal_length as usize * (j + 1) * (i + 1))
+                    .sum::<usize>()
+            })
+            .sum::<usize>()
+            .to_string()
+    }
+}

lib/src/lib.rs

@@ -7,6 +7,7 @@ use day11::Day11;
 use day12::Day12;
 use day13::Day13;
 use day14::Day14;
+use day15::Day15;
 use day2::Day2;
 use day3::Day3;
 use day4::Day4;
@@ -26,6 +27,7 @@ pub mod day11;
 pub mod day12;
 pub mod day13;
 pub mod day14;
+pub mod day15;
 pub mod day2;
 pub mod day3;
 pub mod day4;
@@ -71,6 +73,7 @@ pub fn get_day(day: u8, input: String) -> Box<dyn Day> {
         }),
         13 => Box::new(Day13 { input }),
         14 => Box::new(Day14 { input }),
+        15 => Box::new(Day15 { input }),
         _ => panic!("Invalid day #"),
     }
 }

solution.txt

@@ -0,0 +1,5 @@
+C\_.{⟨Ctrl+R⟩=len('⟨Ctrl+R⟩-')⟨Enter⟩}⟨Esc⟩yiWu
+:%s/\v\.(⟨Ctrl+R⟩0)O/O\1./g⟨Enter⟩qaqqag&gg:redr|sl25m⟨Enter⟩@aq@a
+⟨Ctrl+V⟩GI+0 *(0⟨Esc⟩gvlg⟨Ctrl+A⟩GyiWugvpjVGg⟨Ctrl+X⟩
+:%s/O/+1/g|%s/[.#]//g|%s/$/)⟨Enter⟩
+VggJ0C⟨Ctrl+R⟩=⟨Ctrl+R⟩-⟨Enter⟩⟨Esc⟩