Solutions to day 08. ★

2016/day-08/Cargo.toml

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+[package]
+name = "day-08"
+version = "0.1.0"
+authors = ["Bert Peters <bert.ljpeters@gmail.com>"]
+
+[dependencies]

2016/day-08/input.txt

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+rect 1x1
+rotate row y=0 by 6
+rect 1x1
+rotate row y=0 by 3
+rect 1x1
+rotate row y=0 by 5
+rect 1x1
+rotate row y=0 by 4
+rect 2x1
+rotate row y=0 by 5
+rect 2x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 5
+rect 4x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 3
+rect 1x1
+rotate row y=0 by 3
+rect 1x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 6
+rect 4x1
+rotate row y=0 by 4
+rotate column x=0 by 1
+rect 3x1
+rotate row y=0 by 6
+rotate column x=0 by 1
+rect 4x1
+rotate column x=10 by 1
+rotate row y=2 by 16
+rotate row y=0 by 8
+rotate column x=5 by 1
+rotate column x=0 by 1
+rect 7x1
+rotate column x=37 by 1
+rotate column x=21 by 2
+rotate column x=15 by 1
+rotate column x=11 by 2
+rotate row y=2 by 39
+rotate row y=0 by 36
+rotate column x=33 by 2
+rotate column x=32 by 1
+rotate column x=28 by 2
+rotate column x=27 by 1
+rotate column x=25 by 1
+rotate column x=22 by 1
+rotate column x=21 by 2
+rotate column x=20 by 3
+rotate column x=18 by 1
+rotate column x=15 by 2
+rotate column x=12 by 1
+rotate column x=10 by 1
+rotate column x=6 by 2
+rotate column x=5 by 1
+rotate column x=2 by 1
+rotate column x=0 by 1
+rect 35x1
+rotate column x=45 by 1
+rotate row y=1 by 28
+rotate column x=38 by 2
+rotate column x=33 by 1
+rotate column x=28 by 1
+rotate column x=23 by 1
+rotate column x=18 by 1
+rotate column x=13 by 2
+rotate column x=8 by 1
+rotate column x=3 by 1
+rotate row y=3 by 2
+rotate row y=2 by 2
+rotate row y=1 by 5
+rotate row y=0 by 1
+rect 1x5
+rotate column x=43 by 1
+rotate column x=31 by 1
+rotate row y=4 by 35
+rotate row y=3 by 20
+rotate row y=1 by 27
+rotate row y=0 by 20
+rotate column x=17 by 1
+rotate column x=15 by 1
+rotate column x=12 by 1
+rotate column x=11 by 2
+rotate column x=10 by 1
+rotate column x=8 by 1
+rotate column x=7 by 1
+rotate column x=5 by 1
+rotate column x=3 by 2
+rotate column x=2 by 1
+rotate column x=0 by 1
+rect 19x1
+rotate column x=20 by 3
+rotate column x=14 by 1
+rotate column x=9 by 1
+rotate row y=4 by 15
+rotate row y=3 by 13
+rotate row y=2 by 15
+rotate row y=1 by 18
+rotate row y=0 by 15
+rotate column x=13 by 1
+rotate column x=12 by 1
+rotate column x=11 by 3
+rotate column x=10 by 1
+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 2
+rotate column x=2 by 1
+rotate column x=1 by 1
+rotate column x=0 by 1
+rect 14x1
+rotate row y=3 by 47
+rotate column x=19 by 3
+rotate column x=9 by 3
+rotate column x=4 by 3
+rotate row y=5 by 5
+rotate row y=4 by 5
+rotate row y=3 by 8
+rotate row y=1 by 5
+rotate column x=3 by 2
+rotate column x=2 by 3
+rotate column x=1 by 2
+rotate column x=0 by 2
+rect 4x2
+rotate column x=35 by 5
+rotate column x=20 by 3
+rotate column x=10 by 5
+rotate column x=3 by 2
+rotate row y=5 by 20
+rotate row y=3 by 30
+rotate row y=2 by 45
+rotate row y=1 by 30
+rotate column x=48 by 5
+rotate column x=47 by 5
+rotate column x=46 by 3
+rotate column x=45 by 4
+rotate column x=43 by 5
+rotate column x=42 by 5
+rotate column x=41 by 5
+rotate column x=38 by 1
+rotate column x=37 by 5
+rotate column x=36 by 5
+rotate column x=35 by 1
+rotate column x=33 by 1
+rotate column x=32 by 5
+rotate column x=31 by 5
+rotate column x=28 by 5
+rotate column x=27 by 5
+rotate column x=26 by 5
+rotate column x=17 by 5
+rotate column x=16 by 5
+rotate column x=15 by 4
+rotate column x=13 by 1
+rotate column x=12 by 5
+rotate column x=11 by 5
+rotate column x=10 by 1
+rotate column x=8 by 1
+rotate column x=2 by 5
+rotate column x=1 by 5

2016/day-08/src/main.rs

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+use std::env;
+use std::io::prelude::*;
+use std::io::BufReader;
+use std::fs::File;
+
+fn is_splitpoint(c: char) -> bool
+{
+    match c {
+        ' ' => true,
+        'x' => true,
+        'y' => true,
+        '=' => true,
+        _ => false,
+    }
+}
+
+const WIDTH: usize = 50;
+const HEIGHT: usize = 6;
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    let f = File::open(&args[1]).expect("Could not open file");
+    let reader = BufReader::new(f);
+
+    let mut lights = [[false; HEIGHT]; WIDTH];
+    for line in reader.lines() {
+        let contents = line.unwrap();
+        let parts: Vec<&str> = contents.split(|c| is_splitpoint(c)).collect();
+
+        match parts[0] {
+            "rect" => {
+                let width: usize = parts[1].parse().unwrap();
+                let height: usize = parts[2].parse().unwrap();
+                for x in 0..width {
+                    for y in 0..height {
+                        lights[x][y] = true;
+                    }
+                }
+            },
+            "rotate" => {
+                let index: usize = parts[4].parse().expect("Invalid index");
+                let amount: usize = parts[7].parse().expect("Invalid row");
+                match parts[1] {
+                    "row" => {
+                        let mut copy = [false; WIDTH];
+                        for x in 0..WIDTH {
+                            copy[x] = lights[x][index];
+                        }
+                        for x in 0..WIDTH {
+                            lights[(x + amount) % WIDTH][index] = copy[x];
+                        }
+                    },
+                    "column" => {
+                        let mut copy = [false; HEIGHT];
+                        for y in 0..HEIGHT {
+                            copy[y] = lights[index][y];
+                        }
+                        for y in 0..HEIGHT {
+                            lights[index][(y + amount) % HEIGHT] = copy[y];
+                        }
+                    }
+                    _ => panic!("{} is not a supported rotation", parts[1]),
+                }
+            },
+            _ => panic!("{} is not a supported operation", parts[0]),
+        }
+    }
+
+    let mut count = 0;
+    for y in 0..HEIGHT {
+        for x in 0..WIDTH {
+            let mut c = ' ';
+            if lights[x][y] {
+                count += 1;
+                c = '★';
+            }
+            print!("{}", c);
+
+            // spacing between letters
+            if x % 5 == 4 {
+                print!(" ");
+            }
+        }
+        println!("");
+    }
+
+    println!("{} lights active.", count);
+}