Solutions for 2022, as well as 2015-2018 and 2019 up to day 11
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Chris Alge
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8
2016/day08-two_factor_authentication/Cargo.toml
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8
2016/day08-two_factor_authentication/Cargo.toml
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[package]
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name = "day08-two_factor_authentication"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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69
2016/day08-two_factor_authentication/challenge.txt
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69
2016/day08-two_factor_authentication/challenge.txt
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\--- Day 8: Two-Factor Authentication ---
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----------
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You come across a door implementing what you can only assume is an implementation of [two-factor authentication](https://en.wikipedia.org/wiki/Multi-factor_authentication) after a long game of [requirements](https://en.wikipedia.org/wiki/Requirement) [telephone](https://en.wikipedia.org/wiki/Chinese_whispers).
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To get past the door, you first swipe a keycard (no problem; there was one on a nearby desk). Then, it displays a code on a [little screen](https://www.google.com/search?q=tiny+lcd&tbm=isch), and you type that code on a keypad. Then, presumably, the door unlocks.
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Unfortunately, the screen has been smashed. After a few minutes, you've taken everything apart and figured out how it works. Now you just have to work out what the screen *would* have displayed.
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The magnetic strip on the card you swiped encodes a series of instructions for the screen; these instructions are your puzzle input. The screen is *`50` pixels wide and `6` pixels tall*, all of which start *off*, and is capable of three somewhat peculiar operations:
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* `rect AxB` turns *on* all of the pixels in a rectangle at the top-left of the screen which is `A` wide and `B` tall.
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* `rotate row y=A by B` shifts all of the pixels in row `A` (0 is the top row) *right* by `B` pixels. Pixels that would fall off the right end appear at the left end of the row.
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* `rotate column x=A by B` shifts all of the pixels in column `A` (0 is the left column) *down* by `B` pixels. Pixels that would fall off the bottom appear at the top of the column.
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For example, here is a simple sequence on a smaller screen:
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* `rect 3x2` creates a small rectangle in the top-left corner:
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```
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###....
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###....
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.......
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```
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* `rotate column x=1 by 1` rotates the second column down by one pixel:
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```
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#.#....
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###....
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.#.....
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```
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* `rotate row y=0 by 4` rotates the top row right by four pixels:
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```
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....#.#
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###....
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.#.....
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```
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* `rotate column x=1 by 1` again rotates the second column down by one pixel, causing the bottom pixel to wrap back to the top:
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```
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.#..#.#
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#.#....
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.#.....
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```
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As you can see, this display technology is extremely powerful, and will soon dominate the tiny-code-displaying-screen market. That's what the advertisement on the back of the display tries to convince you, anyway.
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There seems to be an intermediate check of the voltage used by the display: after you swipe your card, if the screen did work, *how many pixels should be lit?*
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Your puzzle answer was `110`.
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\--- Part Two ---
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----------
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You notice that the screen is only capable of displaying capital letters; in the font it uses, each letter is `5` pixels wide and `6` tall.
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After you swipe your card, *what code is the screen trying to display?*
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Your puzzle answer was `ZJHRKCPLYJ`.
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Both parts of this puzzle are complete! They provide two gold stars: \*\*
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At this point, all that is left is for you to [admire your Advent calendar](/2016).
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If you still want to see it, you can [get your puzzle input](8/input).
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90
2016/day08-two_factor_authentication/src/lib.rs
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90
2016/day08-two_factor_authentication/src/lib.rs
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#[derive(Debug)]
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struct Screen {
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pixels: [[u8; 50]; 6],
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}
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impl Screen {
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fn new() -> Self {
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Self {
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pixels: [[0; 50]; 6],
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}
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}
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fn rect(&mut self, (x, y): (&str, &str)) {
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let (x, y) = (x.parse().unwrap(), y.parse().unwrap());
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(0..x).for_each(|row| (0..y).for_each(|col| self.pixels[col][row] = 1));
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}
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fn rotate_row(&mut self, y: usize, by: usize) {
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let old_row = self.pixels[y];
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(0..50).for_each(|x| self.pixels[y][x] = old_row[(50 + x - by) % 50]);
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}
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fn rotate_column(&mut self, x: usize, by: usize) {
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let old_col: Vec<u8> = self.pixels.iter().map(|row| row[x]).collect();
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(0..6).for_each(|y| self.pixels[y][x] = old_col[(6 + y - by) % 6]);
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}
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fn perform(&mut self, line: &str) {
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let components: Vec<_> = line.trim().split(' ').collect();
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assert!((2..=5).contains(&components.len()));
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match (components[0], components[1]) {
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("rect", dim) => self.rect(dim.split_once('x').unwrap()),
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("rotate", "row") => self.rotate_row(components[2][2..].parse().unwrap(), components[4].parse().unwrap()),
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("rotate", "column") => self.rotate_column(components[2][2..].parse().unwrap(), components[4].parse().unwrap()),
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_ => panic!("Unexpected Command: {line}"),
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}
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}
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fn render(&self) -> String {
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self.pixels.iter().map(|row| row.iter().map(|px| match px { 0=>" ", _=>"#",}).collect::<String>() + "\n").collect()
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}
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}
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pub fn run(input: &str) -> (usize, String) {
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let mut the_screen = Screen::new();
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input.lines().for_each(|line| the_screen.perform(line));
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let first = the_screen.pixels.into_iter().map(|row| row.into_iter().map(|pixel| pixel as usize).sum::<usize>()).sum();
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let second = the_screen.render();
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(first, second)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::fs::read_to_string;
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fn read_file(name: &str) -> String {
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read_to_string(name).expect(&format!("Unable to read file: {}", name)[..])
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}
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#[test]
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fn test_sample() {
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let sample_input = read_file("tests/sample_input");
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let mut the_screen = Screen::new();
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sample_input.lines().for_each(|line| the_screen.perform(line));
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assert_eq!(run(&sample_input), (6,
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"
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# #
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# #
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#
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#
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"[1..].to_string()));
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}
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#[test]
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fn test_challenge() {
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let challenge_input = read_file("tests/challenge_input");
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assert_eq!(run(&challenge_input), (110,
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"
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#### ## # # ### # # ## ### # # # ##
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# # # # # # # # # # # # # # # #
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# # #### # # ## # # # # # # #
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# # # # ### # # # ### # # #
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# # # # # # # # # # # # # # # #
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#### ## # # # # # # ## # #### # ##
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"[1..].to_string()));
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}
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}
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153
2016/day08-two_factor_authentication/tests/challenge_input
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153
2016/day08-two_factor_authentication/tests/challenge_input
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rect 1x1
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rotate row y=0 by 2
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rect 1x1
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rotate row y=0 by 5
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rect 1x1
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rotate row y=0 by 3
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rect 1x1
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rotate row y=0 by 3
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rect 2x1
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rotate row y=0 by 5
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rect 1x1
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rotate row y=0 by 5
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rect 4x1
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rotate row y=0 by 2
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rect 1x1
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rotate row y=0 by 2
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rect 1x1
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rotate row y=0 by 5
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rect 4x1
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rotate row y=0 by 3
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rect 2x1
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rotate row y=0 by 5
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rect 4x1
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rotate row y=0 by 2
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rect 1x2
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rotate row y=1 by 6
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rotate row y=0 by 2
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rect 1x2
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rotate column x=32 by 1
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rotate column x=23 by 1
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rotate column x=13 by 1
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rotate row y=0 by 6
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rotate column x=0 by 1
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rect 5x1
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rotate row y=0 by 2
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rotate column x=30 by 1
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rotate row y=1 by 20
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rotate row y=0 by 18
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rotate column x=13 by 1
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rotate column x=10 by 1
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rotate column x=7 by 1
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rotate column x=2 by 1
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rotate column x=0 by 1
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rect 17x1
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rotate column x=16 by 3
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rotate row y=3 by 7
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rotate row y=0 by 5
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rotate column x=2 by 1
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rotate column x=0 by 1
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rect 4x1
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rotate column x=28 by 1
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rotate row y=1 by 24
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rotate row y=0 by 21
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rotate column x=19 by 1
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rotate column x=17 by 1
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rotate column x=16 by 1
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rotate column x=14 by 1
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rotate column x=12 by 2
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rotate column x=11 by 1
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rotate column x=9 by 1
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rotate column x=8 by 1
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rotate column x=7 by 1
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rotate column x=6 by 1
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rotate column x=4 by 1
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rotate column x=2 by 1
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rotate column x=0 by 1
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rect 20x1
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rotate column x=47 by 1
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rotate column x=40 by 2
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rotate column x=35 by 2
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rotate column x=30 by 2
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rotate column x=10 by 3
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rotate column x=5 by 3
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rotate row y=4 by 20
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rotate row y=3 by 10
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rotate row y=2 by 20
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rotate row y=1 by 16
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rotate row y=0 by 9
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rotate column x=7 by 2
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rotate column x=5 by 2
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rotate column x=3 by 2
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rotate column x=0 by 2
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rect 9x2
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rotate column x=22 by 2
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rotate row y=3 by 40
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rotate row y=1 by 20
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rotate row y=0 by 20
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rotate column x=18 by 1
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rotate column x=17 by 2
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rotate column x=16 by 1
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rotate column x=15 by 2
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rotate column x=13 by 1
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rotate column x=12 by 1
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rotate column x=11 by 1
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rotate column x=10 by 1
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rotate column x=8 by 3
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rotate column x=7 by 1
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rotate column x=6 by 1
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rotate column x=5 by 1
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rotate column x=3 by 1
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rotate column x=2 by 1
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rotate column x=1 by 1
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rotate column x=0 by 1
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rect 19x1
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rotate column x=44 by 2
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rotate column x=40 by 3
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rotate column x=29 by 1
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rotate column x=27 by 2
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rotate column x=25 by 5
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rotate column x=24 by 2
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rotate column x=22 by 2
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rotate column x=20 by 5
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rotate column x=14 by 3
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rotate column x=12 by 2
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rotate column x=10 by 4
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rotate column x=9 by 3
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rotate column x=7 by 3
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rotate column x=3 by 5
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rotate column x=2 by 2
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rotate row y=5 by 10
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rotate row y=4 by 8
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rotate row y=3 by 8
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rotate row y=2 by 48
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rotate row y=1 by 47
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rotate row y=0 by 40
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rotate column x=47 by 5
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rotate column x=46 by 5
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rotate column x=45 by 4
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rotate column x=43 by 2
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rotate column x=42 by 3
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rotate column x=41 by 2
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rotate column x=38 by 5
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rotate column x=37 by 5
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rotate column x=36 by 5
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rotate column x=33 by 1
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rotate column x=28 by 1
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rotate column x=27 by 5
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rotate column x=26 by 5
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rotate column x=25 by 1
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rotate column x=23 by 5
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rotate column x=22 by 1
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rotate column x=21 by 2
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rotate column x=18 by 1
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rotate column x=17 by 3
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rotate column x=12 by 2
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rotate column x=11 by 2
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rotate column x=7 by 5
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rotate column x=6 by 5
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rotate column x=5 by 4
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rotate column x=3 by 5
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rotate column x=2 by 5
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rotate column x=1 by 3
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rotate column x=0 by 4
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4
2016/day08-two_factor_authentication/tests/sample_input
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4
2016/day08-two_factor_authentication/tests/sample_input
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rect 3x2
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rotate column x=1 by 1
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rotate row y=0 by 4
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rotate column x=1 by 1
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