Day 10

inputs/10.small.txt

@@ -0,0 +1,146 @@
+addx 15
+addx -11
+addx 6
+addx -3
+addx 5
+addx -1
+addx -8
+addx 13
+addx 4
+noop
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx -35
+addx 1
+addx 24
+addx -19
+addx 1
+addx 16
+addx -11
+noop
+noop
+addx 21
+addx -15
+noop
+noop
+addx -3
+addx 9
+addx 1
+addx -3
+addx 8
+addx 1
+addx 5
+noop
+noop
+noop
+noop
+noop
+addx -36
+noop
+addx 1
+addx 7
+noop
+noop
+noop
+addx 2
+addx 6
+noop
+noop
+noop
+noop
+noop
+addx 1
+noop
+noop
+addx 7
+addx 1
+noop
+addx -13
+addx 13
+addx 7
+noop
+addx 1
+addx -33
+noop
+noop
+noop
+addx 2
+noop
+noop
+noop
+addx 8
+noop
+addx -1
+addx 2
+addx 1
+noop
+addx 17
+addx -9
+addx 1
+addx 1
+addx -3
+addx 11
+noop
+noop
+addx 1
+noop
+addx 1
+noop
+noop
+addx -13
+addx -19
+addx 1
+addx 3
+addx 26
+addx -30
+addx 12
+addx -1
+addx 3
+addx 1
+noop
+noop
+noop
+addx -9
+addx 18
+addx 1
+addx 2
+noop
+noop
+addx 9
+noop
+noop
+noop
+addx -1
+addx 2
+addx -37
+addx 1
+addx 3
+noop
+addx 15
+addx -21
+addx 22
+addx -6
+addx 1
+noop
+addx 2
+addx 1
+noop
+addx -10
+noop
+noop
+addx 20
+addx 1
+addx 2
+addx 2
+addx -6
+addx -11
+noop
+noop
+noop

inputs/10.txt

@@ -0,0 +1,145 @@
+noop
+noop
+noop
+addx 3
+addx 7
+noop
+noop
+noop
+noop
+addx 6
+noop
+addx -1
+noop
+addx 5
+addx 1
+noop
+addx 4
+noop
+noop
+noop
+noop
+addx 6
+addx -1
+noop
+addx 3
+addx -13
+addx -22
+noop
+noop
+addx 3
+addx 2
+addx 11
+addx -4
+addx 11
+addx -10
+addx 2
+addx 5
+addx 2
+addx -2
+noop
+addx 7
+addx 3
+addx -2
+addx 2
+addx 5
+addx 2
+addx -2
+addx -8
+addx -27
+addx 5
+addx 2
+addx 21
+addx -21
+addx 3
+addx 5
+addx 2
+addx -3
+addx 4
+addx 3
+addx 1
+addx 5
+noop
+noop
+noop
+noop
+addx 3
+addx 1
+addx 6
+addx -31
+noop
+addx -4
+noop
+noop
+noop
+noop
+addx 3
+addx 7
+noop
+addx -1
+addx 1
+addx 5
+noop
+addx 1
+noop
+addx 2
+addx -8
+addx 15
+addx 3
+noop
+addx 2
+addx 5
+noop
+noop
+noop
+addx -28
+addx 11
+addx -20
+noop
+addx 7
+addx -2
+addx 7
+noop
+addx -2
+noop
+addx -6
+addx 11
+noop
+addx 3
+addx 2
+noop
+noop
+addx 7
+addx 3
+addx -2
+addx 2
+addx 5
+addx 2
+addx -16
+addx -10
+addx -11
+addx 27
+addx -20
+noop
+addx 2
+addx 3
+addx 5
+noop
+noop
+noop
+addx 3
+addx -2
+addx 2
+noop
+addx -14
+addx 21
+noop
+addx -6
+addx 12
+noop
+addx -21
+addx 24
+addx 2
+noop
+noop
+noop

src/main.rs

@@ -250,9 +250,110 @@ solutions! {
             let visits = motion_visits(motions, 10);
             (visits.len() as u64).into()
         },
+    ],
+    [
+        // day 10 part 1
+        |input| {
+            let cmds = input.lines().map(Cmd::from_str).collect();
+            Screen::new().get_signal_strength(cmds).into()
+        },
+        // day 10 part 2
+        |input| {
+            let cmds = input.lines().map(Cmd::from_str).collect();
+            Screen::new().draw(cmds).to_string().into()
+        }
     ]
 }
 
+struct Screen {
+    x: isize,
+    cycle: isize,
+    strength: isize,
+    output: String,
+}
+
+impl Screen {
+    fn new() -> Self {
+        Screen {
+            x: 1,
+            cycle: 1,
+            strength: 0,
+            output: String::new(),
+        }
+    }
+
+    fn step_cycle(&mut self) {
+        println!("cycle {}, x={}", self.cycle, self.x);
+        self.cycle += 1;
+        if (self.cycle - 20) % 40 == 0 {
+            println!(
+                "cycle {}, x={}, signal={}",
+                self.cycle,
+                self.x,
+                self.x * self.cycle
+            );
+            self.strength += self.x * self.cycle;
+        }
+    }
+
+    fn get_signal_strength(&mut self, cmds: Vec<Cmd>) -> u64 {
+        for cmd in cmds {
+            match cmd {
+                Cmd::Noop => self.step_cycle(),
+                Cmd::Addx(n) => {
+                    self.step_cycle();
+                    self.x += n;
+                    self.step_cycle();
+                }
+            }
+        }
+        self.strength as u64
+    }
+
+    fn draw_cycle(&mut self) {
+        let coord = (self.cycle - 1) % 40;
+        let sprite = self.x - 1..=self.x + 1;
+        if sprite.contains(&coord) {
+            self.output.push('#');
+        } else {
+            self.output.push('.');
+        }
+        if self.cycle % 40 == 0 {
+            self.output.push('\n')
+        }
+        self.cycle += 1
+    }
+
+    fn draw(&mut self, cmds: Vec<Cmd>) -> &str {
+        for cmd in cmds {
+            match cmd {
+                Cmd::Noop => self.draw_cycle(),
+                Cmd::Addx(n) => {
+                    self.draw_cycle();
+                    self.draw_cycle();
+                    self.x += n;
+                }
+            }
+        }
+        &self.output
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+enum Cmd {
+    Noop,
+    Addx(isize),
+}
+
+impl Cmd {
+    fn from_str(s: &str) -> Self {
+        match s {
+            "noop" => Cmd::Noop,
+            _ => Cmd::Addx(s[5..].parse::<isize>().unwrap()),
+        }
+    }
+}
+
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 struct Pos {
     x: isize,