From f38991e9e87eca75dcebc6629b60a7ad9a7daae3 Mon Sep 17 00:00:00 2001 From: Russell Champoux Date: Thu, 8 Dec 2016 11:14:44 -0500 Subject: [PATCH] Day 8 solution --- 2016/day08/Cargo.lock | 98 ++++++++++++++++++++++++++++++++++++++++++ 2016/day08/Cargo.toml | 7 +++ 2016/day08/src/main.rs | 92 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 197 insertions(+) create mode 100644 2016/day08/Cargo.lock create mode 100644 2016/day08/Cargo.toml create mode 100644 2016/day08/src/main.rs diff --git a/2016/day08/Cargo.lock b/2016/day08/Cargo.lock new file mode 100644 index 0000000..1234e55 --- /dev/null +++ b/2016/day08/Cargo.lock @@ -0,0 +1,98 @@ +[root] +name = "day08" +version = "0.1.0" +dependencies = [ + "regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)", +] + +[[package]] +name = "aho-corasick" +version = "0.5.3" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "memchr 0.1.11 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100644 index 0000000..a5535e2 --- /dev/null +++ b/2016/day08/Cargo.toml @@ -0,0 +1,7 @@ +[package] +name = "day08" +version = "0.1.0" +authors = ["~krowbar"] + +[dependencies] +regex = "0.1" \ No newline at end of file diff --git a/2016/day08/src/main.rs b/2016/day08/src/main.rs new file mode 100644 index 0000000..0d16e59 --- /dev/null +++ b/2016/day08/src/main.rs @@ -0,0 +1,92 @@ +extern crate regex; + +use regex::Regex; +use regex::RegexSet; +use std::io::Read; +use std::fs::File; + +const GRID_WIDTH: usize = 50; +const GRID_HEIGHT: usize = 6; + +fn part_1_2(input: &String) { + let mut grid = [[false; GRID_WIDTH]; GRID_HEIGHT]; //grid of bools, 50 across by 6 down + + let set = RegexSet::new(&[ + r"rect (\d+)x(\d+)", + r"rotate row y=(\d+) by (\d+)", + r"rotate column x=(\d+) by (\d+)", + ]).unwrap(); + + let re_rect = Regex::new(r"rect (\d+)x(\d+)").unwrap(); + let re_rot_r = Regex::new(r"rotate row y=(\d+) by (\d+)").unwrap(); + let re_rot_c = Regex::new(r"rotate column x=(\d+) by (\d+)").unwrap(); + + for line in input.lines() { + let match_set: Vec<_> = set.matches(line.trim()).into_iter().collect(); + match match_set[0] { + 0 /*rect*/ => { + let cap = re_rect.captures(line).unwrap(); + let width = cap.at(1).unwrap().parse().unwrap(); + let height = cap.at(2).unwrap().parse().unwrap(); + //println!("rect ({}, {})", width, height); + for row in 0..height { + for col in 0..width { + grid[row][col] = true; + } + } + }, + 1 /*rotate row*/ => { + let cap = re_rot_r.captures(line).unwrap(); + let y: usize = cap.at(1).unwrap().parse().unwrap(); + let by: usize = cap.at(2).unwrap().parse().unwrap(); + //println!("row ({} by {})", y, by); + //copy all the values off from this row, then we'll shift the values + let mut from = [false; GRID_WIDTH]; + for col in 0..GRID_WIDTH { + from[col] = grid[y][col]; + grid[y][col] = false; + } + for col in 0..GRID_WIDTH { + let new_col: usize = (col + by) % GRID_WIDTH; + grid[y][new_col] = from[col]; + } + }, + 2 /*rotate column*/=> { + let cap = re_rot_c.captures(line).unwrap(); + let x: usize = cap.at(1).unwrap().parse().unwrap(); + let by: usize = cap.at(2).unwrap().parse().unwrap(); + //println!("col ({} by {})", x, by); + //copy all the values off from this column, then we'll shift the values + let mut from = [false; GRID_HEIGHT]; + for row in 0..GRID_HEIGHT { + from[row] = grid[row][x]; + grid[row][x] = false; + } + for row in 0..GRID_HEIGHT { + let new_row: usize = (row + by) % GRID_HEIGHT; + grid[new_row][x] = from[row]; + } + }, + _ /*no match*/=> {}, //what happened? + } + } + let mut sum = 0; + for row in 0..GRID_HEIGHT { + for col in 0..GRID_WIDTH { + match grid[row][col] { + true => { print!("#"); sum = sum + 1; }, + false => print!("."), + } + } + println!(""); + } + println!("Total pixels: {}", sum); +} + +fn main() { + let mut file = File::open("./data").expect("could not open file"); + let mut input = String::new(); + file.read_to_string(&mut input).expect("could not read file"); + + part_1_2(&input); +}