add day 8

day08/Cargo.lock

@@ -0,0 +1,25 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "day08"
+version = "0.1.0"
+dependencies = [
+ "itertools",
+]
+
+[[package]]
+name = "either"
+version = "1.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91622ff5e7162018101f2fea40d6ebf4a78bbe5a49736a2020649edf9693679e"
+
+[[package]]
+name = "itertools"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b4baf93f58d4425749ca49a51c50ebab072c5df6994d08fed93541c331481dc"
+dependencies = [
+ "either",
+]

day08/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "day08"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+itertools = "*"

day08/example.txt

@@ -0,0 +1,4 @@
+rect 3x2
+rotate column x=1 by 1
+rotate row y=0 by 4
+rotate column x=1 by 1

day08/input.txt

@@ -0,0 +1,194 @@
+rect 1x1
+rotate row y=0 by 7
+rect 1x1
+rotate row y=0 by 5
+rect 1x1
+rotate row y=0 by 5
+rect 1x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 3
+rect 1x1
+rotate row y=0 by 5
+rect 1x1
+rotate row y=0 by 3
+rect 1x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 3
+rect 2x1
+rotate row y=0 by 7
+rect 6x1
+rotate row y=0 by 3
+rect 2x1
+rotate row y=0 by 2
+rect 1x2
+rotate row y=1 by 10
+rotate row y=0 by 3
+rotate column x=0 by 1
+rect 2x1
+rotate column x=20 by 1
+rotate column x=15 by 1
+rotate column x=5 by 1
+rotate row y=1 by 5
+rotate row y=0 by 2
+rect 1x2
+rotate row y=0 by 5
+rotate column x=0 by 1
+rect 4x1
+rotate row y=2 by 15
+rotate row y=0 by 5
+rotate column x=0 by 1
+rect 4x1
+rotate row y=2 by 5
+rotate row y=0 by 5
+rotate column x=0 by 1
+rect 4x1
+rotate row y=2 by 10
+rotate row y=0 by 10
+rotate column x=8 by 1
+rotate column x=5 by 1
+rotate column x=0 by 1
+rect 9x1
+rotate column x=27 by 1
+rotate row y=0 by 5
+rotate column x=0 by 1
+rect 4x1
+rotate column x=42 by 1
+rotate column x=40 by 1
+rotate column x=22 by 1
+rotate column x=17 by 1
+rotate column x=12 by 1
+rotate column x=7 by 1
+rotate column x=2 by 1
+rotate row y=3 by 10
+rotate row y=2 by 5
+rotate row y=1 by 3
+rotate row y=0 by 10
+rect 1x4
+rotate column x=37 by 2
+rotate row y=3 by 18
+rotate row y=2 by 30
+rotate row y=1 by 7
+rotate row y=0 by 2
+rotate column x=13 by 3
+rotate column x=12 by 1
+rotate column x=10 by 1
+rotate column x=7 by 1
+rotate column x=6 by 3
+rotate column x=5 by 1
+rotate column x=3 by 3
+rotate column x=2 by 1
+rotate column x=0 by 1
+rect 14x1
+rotate column x=38 by 3
+rotate row y=3 by 12
+rotate row y=2 by 10
+rotate row y=0 by 10
+rotate column x=7 by 1
+rotate column x=5 by 1
+rotate column x=2 by 1
+rotate column x=0 by 1
+rect 9x1
+rotate row y=4 by 20
+rotate row y=3 by 25
+rotate row y=2 by 10
+rotate row y=0 by 15
+rotate column x=12 by 1
+rotate column x=10 by 1
+rotate column x=8 by 3
+rotate column x=7 by 1
+rotate column x=5 by 1
+rotate column x=3 by 3
+rotate column x=2 by 1
+rotate column x=0 by 1
+rect 14x1
+rotate column x=34 by 1
+rotate row y=1 by 45
+rotate column x=47 by 1
+rotate column x=42 by 1
+rotate column x=19 by 1
+rotate column x=9 by 2
+rotate row y=4 by 7
+rotate row y=3 by 20
+rotate row y=0 by 7
+rotate column x=5 by 1
+rotate column x=3 by 1
+rotate column x=2 by 1
+rotate column x=0 by 1
+rect 6x1
+rotate row y=4 by 8
+rotate row y=3 by 5
+rotate row y=1 by 5
+rotate column x=5 by 1
+rotate column x=4 by 1
+rotate column x=3 by 2
+rotate column x=2 by 1
+rotate column x=1 by 3
+rotate column x=0 by 1
+rect 6x1
+rotate column x=36 by 3
+rotate column x=25 by 3
+rotate column x=18 by 3
+rotate column x=11 by 3
+rotate column x=3 by 4
+rotate row y=4 by 5
+rotate row y=3 by 5
+rotate row y=2 by 8
+rotate row y=1 by 8
+rotate row y=0 by 3
+rotate column x=3 by 4
+rotate column x=0 by 4
+rect 4x4
+rotate row y=4 by 10
+rotate row y=3 by 20
+rotate row y=1 by 10
+rotate row y=0 by 10
+rotate column x=8 by 1
+rotate column x=7 by 1
+rotate column x=6 by 1
+rotate column x=5 by 1
+rotate column x=3 by 1
+rotate column x=2 by 1
+rotate column x=1 by 1
+rotate column x=0 by 1
+rect 9x1
+rotate row y=0 by 40
+rotate column x=44 by 1
+rotate column x=35 by 5
+rotate column x=18 by 5
+rotate column x=15 by 3
+rotate column x=10 by 5
+rotate row y=5 by 15
+rotate row y=4 by 10
+rotate row y=3 by 40
+rotate row y=2 by 20
+rotate row y=1 by 45
+rotate row y=0 by 35
+rotate column x=48 by 1
+rotate column x=47 by 5
+rotate column x=46 by 5
+rotate column x=45 by 1
+rotate column x=43 by 1
+rotate column x=40 by 1
+rotate column x=38 by 2
+rotate column x=37 by 3
+rotate column x=36 by 2
+rotate column x=32 by 2
+rotate column x=31 by 2
+rotate column x=28 by 1
+rotate column x=23 by 3
+rotate column x=22 by 3
+rotate column x=21 by 5
+rotate column x=20 by 1
+rotate column x=18 by 1
+rotate column x=17 by 3
+rotate column x=13 by 1
+rotate column x=10 by 1
+rotate column x=8 by 1
+rotate column x=7 by 5
+rotate column x=6 by 5
+rotate column x=5 by 1
+rotate column x=3 by 5
+rotate column x=2 by 5
+rotate column x=1 by 5

day08/src/main.rs

@@ -0,0 +1,107 @@
+#[cfg(debug_assertions)]
+const SCREEN_X: usize = 7;
+#[cfg(debug_assertions)]
+const SCREEN_Y: usize = 3;
+#[cfg(debug_assertions)]
+const FILENAME: &str = "example.txt";
+
+#[cfg(not(debug_assertions))]
+const SCREEN_X: usize = 50;
+#[cfg(not(debug_assertions))]
+const SCREEN_Y: usize = 6;
+#[cfg(not(debug_assertions))]
+const FILENAME: &str = "input.txt";
+
+fn main() {
+    let mut grid = vec![vec!['.'; SCREEN_Y]; SCREEN_X];
+
+    let instructions: Vec<_> = std::fs::read_to_string(FILENAME)
+        .unwrap()
+        .lines()
+        .map(Instruction::parse)
+        .collect();
+
+    part1(&mut grid, instructions);
+}
+
+#[allow(clippy::needless_range_loop, clippy::ptr_arg)]
+fn part1(grid: &mut Vec<Vec<char>>, instructions: Vec<Instruction>) {
+    for instruction in &instructions {
+        match instruction {
+            Instruction::Rect(x, y) => {
+                for ix in 0..*x {
+                    for iy in 0..*y {
+                        grid[ix][iy] = '#';
+                    }
+                }
+            }
+            Instruction::RotateX(x, y) => {
+                grid.get_mut(*x).unwrap().rotate_right(*y);
+            }
+            Instruction::RotateY(y, x) => {
+                let mut the_vec = vec![];
+                for ix in 0..SCREEN_X {
+                    the_vec.push(grid[ix][*y]);
+                }
+                the_vec.rotate_right(*x);
+                for ix in 0..SCREEN_X {
+                    grid[ix][*y] = the_vec[ix];
+                }
+            }
+        }
+    }
+
+    let result = grid.iter().flatten().filter(|e| **e == '#').count();
+    println!("{result}"); // 128
+
+    for iy in 0..SCREEN_Y {
+        for ix in 0..SCREEN_X {
+            print!("{}", grid[ix][iy]);
+        }
+        println!(); // EOARGPHYAO
+    }
+}
+
+#[derive(Debug)]
+enum Instruction {
+    Rect(usize, usize),
+    RotateX(usize, usize), // x=2 by 5  => RotateX(2, 5)
+    RotateY(usize, usize), // y=0 by 3  => RotateY(0, 3)
+}
+
+impl Instruction {
+    fn parse(s: &str) -> Self {
+        let mut words = s.split_whitespace();
+
+        let first = words.next().unwrap();
+
+        if first == "rect" {
+            let tuple = parse_grid(words.next().unwrap());
+            Self::Rect(tuple.0, tuple.1)
+        } else {
+            let second = words.next().unwrap();
+            let tuple = parse_rotate(words);
+            if second == "row" {
+                Self::RotateY(tuple.0, tuple.1)
+            } else {
+                Self::RotateX(tuple.0, tuple.1)
+            }
+        }
+    }
+}
+
+fn parse_rotate<'a>(mut words: impl DoubleEndedIterator<Item = &'a str>) -> (usize, usize) {
+    let equals = words.next().unwrap();
+    let equals_value = equals.split('=').next_back().unwrap().parse().unwrap();
+
+    let shift = words.next_back().unwrap().parse().unwrap();
+
+    (equals_value, shift)
+}
+
+fn parse_grid(s: &str) -> (usize, usize) {
+    let mut iter = s.split('x');
+    let x = iter.next().unwrap().to_string().parse().unwrap();
+    let y = iter.next().unwrap().to_string().parse().unwrap();
+    (x, y)
+}