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use std::fs;
fn solve_puzzle(lines: &Vec<&str>) -> [[bool; 6]; 50] {
let mut pixels = [[false; 6]; 50];
for line in lines {
let words: Vec<&str> = line.split_ascii_whitespace().collect();
if words[0] == "rect" {
// Read operation parameters
let wxh: Vec<&str> = words[1].split('x').collect();
let w: usize = wxh[0].parse().unwrap();
let h: usize = wxh[1].parse().unwrap();
// Apply operation to state
for x in 0..w {
for y in 0..h {
pixels[x][y] = true;
}
}
} else if words[0] == "rotate" && words[1] == "row" {
// Read operation parameters
let which: Vec<&str> = words[2].split('=').collect();
let y: usize = which[1].parse().unwrap();
let n: usize = words[4].parse().unwrap();
// Apply operation to state
let mut old = Vec::new();
for x in 0..50 {
old.push(pixels[x][y]);
}
for x in 0..50 {
pixels[x][y] = old[(x + 50 - n) % 50];
}
} else if words[0] == "rotate" && words[1] == "column" {
// Read operation parameters
let which: Vec<&str> = words[2].split('=').collect();
let x: usize = which[1].parse().unwrap();
let n: usize = words[4].parse().unwrap();
// Apply operation to state
let old = pixels[x];
for y in 0..6 {
pixels[x][y] = old[(y + 6 - n) % 6];
}
}
}
pixels
}
fn main() {
let input = fs::read_to_string("input.txt").unwrap();
let lines = input.lines().collect();
let pixels = solve_puzzle(&lines);
// Part 2 must be read by eye, gives "UPOJFLBCEZ" for me
println!("Part 2 solution:");
let mut total = 0;
for y in 0..6 {
print!("\t");
for x in 0..50 {
print!(
"{}",
if pixels[x][y] {
total += 1;
'#'
} else {
' '
}
);
}
print!("\n");
}
// Part 1 gives 116 for me
println!("Part 1 solution: {}", total);
}
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