diff options
Diffstat (limited to 'aoc8/src')
-rw-r--r-- | aoc8/src/main.rs | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/aoc8/src/main.rs b/aoc8/src/main.rs new file mode 100644 index 0000000..cb783ae --- /dev/null +++ b/aoc8/src/main.rs @@ -0,0 +1,117 @@ +extern crate regex; +use regex::Regex; + +use std::io::BufReader; +use std::io::prelude::*; +use std::fs::File; + + +struct Screen { + data: [[bool; 6]; 50] +} + +impl Screen { + fn new() -> Screen { + Screen { + data: [[false; 6]; 50] + } + } + + fn rect(&mut self, a: usize, b: usize) { + for x in 0..a { + for y in 0..b { + self.data[x][y] = true; + } + } + } + + fn rotate_row(&mut self, y: usize, b: usize) { + let mut row_copy = [false; 50]; + for x in 0..50 { + row_copy[x] = self.data[x][y]; + } + for x in 0..50 { + self.data[x][y] = row_copy[(x+50-b)%50]; + } + } + + fn rotate_col(&mut self, x: usize, b: usize) { + let mut col_copy = [false; 6]; + for y in 0..6 { + col_copy[y] = self.data[x][y]; + } + for y in 0..6 { + self.data[x][y] = col_copy[(y+6-b)%6]; + } + } + + fn print(&self) { + for y in 0..6 { + for x in 0..50 { + print!("{}", if self.data[x][y] {'#'} else {'.'}); + } + println!(""); + } + } + + fn count_on(&self) -> u32 { + let mut count = 0; + for y in 0..6 { + for x in 0..50 { + if self.data[x][y] { + count += 1; + } + } + } + count + } +} + + +fn main() { + let lines = read_file(); + let mut screen = Screen::new(); + for line in lines { + if line.starts_with("rect") { + //rect 3x4 + let re = Regex::new(r"rect (\d+)x(\d+)").unwrap(); + let cap = re.captures(line.as_ref()).unwrap(); + println!("{} parsed as RECT. A={}, B={}", + line, + cap.at(1).unwrap_or(""), cap.at(2).unwrap_or("")); + screen.rect(cap.at(1).unwrap().parse().unwrap(), cap.at(2).unwrap().parse().unwrap()); + + } + else if line.starts_with("rotate row") { + //rotate row y=0 by 4 + let re = Regex::new(r"rotate row y=(\d+) by (\d+)").unwrap(); + let cap = re.captures(line.as_ref()).unwrap(); + println!("{} parsed as ROTATE ROW. A={}, B={}", + line, + cap.at(1).unwrap_or(""), cap.at(2).unwrap_or("")); + screen.rotate_row(cap.at(1).unwrap().parse().unwrap(), cap.at(2).unwrap().parse().unwrap()); + } + else if line.starts_with("rotate column") { + //rotate column x=1 by 1 + let re = Regex::new(r"rotate column x=(\d+) by (\d+)").unwrap(); + let cap = re.captures(line.as_ref()).unwrap(); + println!("{} parsed as ROTATE COLUMN. A={}, B={}", + line, + cap.at(1).unwrap_or(""), cap.at(2).unwrap_or("")); + screen.rotate_col(cap.at(1).unwrap().parse().unwrap(), cap.at(2).unwrap().parse().unwrap()); + + } + + screen.print(); + } + + println!("On: {}", screen.count_on()); +} + +fn read_file() -> Vec<String> { + let file = BufReader::new(File::open("input.txt").unwrap()); + file.lines() + .map(|line| line.unwrap().trim().to_string()) + .filter(|line| line.len() > 0) + .collect() +} |