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Add day 19 solution
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[[package]]
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name = "day19"
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version = "0.1.0"
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[package]
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name = "day19"
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version = "0.1.0"
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authors = ["Wesley Moore <wes@wezm.net>"]
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[dependencies]
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | V | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
+-|-------------|-------+ | | | | | | | | | | | | | | | | | | | | +---------------|-------|-+ | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | +-------------+ | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
+-+ | | | | | | | | +-------------|-------|---|-------+ | | | | +---|-|-|-----------|-|-------+ | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | +-----|-|-------------|---|---------------|-------|---|-------|---|-----|---|---------------------|---|---|-------------------|-----|---|-|-------|-------|-------|-+ | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | | +---|-------------------|---------+ | | | | | | | +---+ | | +-|-+ | | | | | | | | | | | | +---|---------|-|-----+ | | +---------+ | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | +-------|-------------------+ +---------+ | | +-----|---|---|-+ | | | | | | | | | | +---------|---|---------|---|-+ | | | | | | | +-+ | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | +-|-------|---|---+ +---------|-------------|-|-|-|-----|---|---|-|---------+ +-----|-----------------------------------|-----------|---|---|---|-|-------|-+ | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | T | | | | | | | | | | | | | |
|
||||||
|
+---|-----|-|-------|-------|---------------------------------|---|---------|-|-----|---|-----------------------|---------------|-|-----|---+ | | | | | | | | | | | +-+ | | +-+ | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | | | +-----|-|-|-----|---|---------|---|-----------------------|-------|-|-----------|-|-|----------E------|-------|---|---+ | | | | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | +-------|-----------|---------------------------|-|-|---|---|-----------|---|-----+ | | | | | | | | | | | | | +---|-----------|---------|---+ | | | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | +-|-|-------------------------------|-|-|-------|-|---|---------|---------------+ | +---------------|---|---------|---------------------|---+ | | | | +-+ | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | +---------------------------------|-|-|---|---|-|---|-|-------|-----------|-------|-----------|---|-------------|---|-----|---|---|-----|-|-------|---+ | +-+ | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
+-----+ +-----+ | | | | | | | | | | | | | | | | | | +---|-+ | | | | | | +-----|-------|---------|-----------|-----+ | +---|-+ | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
+---------------------------|---+ | | | | | | | | | | +-------|-------|-----------|-------|---|-----------|-|---------------------|-----|-|---+ | +-------|-+ | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | +---|-----------|---|-|-----|-------|---|-|-----+ | | +-|---------|---|---------|-|---|-+ | | +-+ | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
+-----------|-----|-------|---|---------------------------------|-------|---|-------|---------------|-----------|---+ | | | | | | | | | +-----|-+ | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
+---------------|-|-|---------|-----------------------------|-----|-|-------|-|---|-|---|---|-------|---------------|-------|---|-|-|---------|---+ | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | +-|---|-+ +-------------------------------+ | | | | | +-----|---|-------|---------------|-------|-------|---+ | | | +-----|-|---|-----------|-|---------------|---+ | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
+-----------|-----|-|---|-|---|-|---+ | | | | | | | | | | | | | | +---|---|---|-|-|-+ | | | | | +---|---------|-|-----|-|---|---+ +-----|---+ | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | | | | | +---------------|---|-------|---|-|-----|---|-----------|---|-|---------|-------|-|-|---+ | | +---+ | | | | +-+ | +---|-------------+ | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | +-------+ +-------|-----------------------------|---+ +-|-----------|-------+ | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
+---+ | | +-----|---------|---------|---------------|-------|-----|-+ | | | | | +---------|-----|-------|-------------|---------|-|-----------|-----|---+ | +-|-+ | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
+---|-----+ | | | | | | | | | | | | | | | +-|---|-----|---|-----------|-------+ +-----|---|-----------------|-----|-------|-|---------------|-------|---+ | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | +---|---|-|-----|---+ | | | | | +---------|---|-------------------------------------|-|-------------------------|-|---+ | | | | +-------|-|-------+ | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | +---------|---------------|-----------|---|-------------|---------------|-----|-----------|---------+ | +-+ | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
+-----|-----|---------+ | | | | +---+ | | | +-----------------------|-----------------+ | | | | | | | | | | | | | +---------|---+ +-----|-+ | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| +---|-------|---|-+ | | +-------|---------------|-----------------------|---|---|-------------|-|-----------+ | | | | +-------|---|-|-+ | | +---|-----|-----------|---|---+ | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | +-|-----------------------+ | +-----------|---------------+ | | | +-|-----|-|-------+ | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
+-----|-----------|-------|-------|---------------|-------|-------------+ | +---+ +-|-----|-------------------|-------------|-|-----|---+ +-+ | | | | | | | +---+ +-+ | | +---+ | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| | +---+ | | | | | | | +---------------|-----|-----------------------------------------|---------+ | | | +-------|-----------+ | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| +-----------|-------|---------------|-|-----|-------------------------------------|-------------------|-----------+ | +-----+ +-----------------------+ | | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
| +---------------------------|-----|-------------------------------|-------|-----------------|-------------+ +-------------|-------------+ +-------|---+ | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
+-------------------|-----------------------|-|-----|---------------------------------------------+ +---------|---------------------------+ | | | +---|-+ | | | | |
|
||||||
|
| | | | | | | | | | | | | | | | | | | | | |
|
||||||
|
+-------+ +-+ +---------+ +-------------+ +---------|---------------------------|-----|---------------|-----------+ +---|-+
|
||||||
|
| | | | | | | | | |
|
||||||
|
+-------------------------------------+ +-----------------+ +-----|-------------------------------+ | |
|
||||||
|
| | | | | | | |
|
||||||
|
+-------------------------------------------------------------------------------------------+ +-+ +---------------+ +-+
|
||||||
|
|
||||||
26
2017/day/19/problem.txt
Normal file
26
2017/day/19/problem.txt
Normal file
|
|
@ -0,0 +1,26 @@
|
||||||
|
--- Day 19: A Series of Tubes ---
|
||||||
|
|
||||||
|
Somehow, a network packet got lost and ended up here. It's trying to follow a routing diagram (your puzzle input), but it's confused about where to go.
|
||||||
|
|
||||||
|
Its starting point is just off the top of the diagram. Lines (drawn with |, -, and +) show the path it needs to take, starting by going down onto the only line connected to the top of the diagram. It needs to follow this path until it reaches the end (located somewhere within the diagram) and stop there.
|
||||||
|
|
||||||
|
Sometimes, the lines cross over each other; in these cases, it needs to continue going the same direction, and only turn left or right when there's no other option. In addition, someone has left letters on the line; these also don't change its direction, but it can use them to keep track of where it's been. For example:
|
||||||
|
|
||||||
|
|
|
||||||
|
| +--+
|
||||||
|
A | C
|
||||||
|
F---|----E|--+
|
||||||
|
| | | D
|
||||||
|
+B-+ +--+
|
||||||
|
|
||||||
|
Given this diagram, the packet needs to take the following path:
|
||||||
|
|
||||||
|
Starting at the only line touching the top of the diagram, it must go down, pass through A, and continue onward to the first +.
|
||||||
|
Travel right, up, and right, passing through B in the process.
|
||||||
|
Continue down (collecting C), right, and up (collecting D).
|
||||||
|
Finally, go all the way left through E and stopping at F.
|
||||||
|
|
||||||
|
Following the path to the end, the letters it sees on its path are ABCDEF.
|
||||||
|
|
||||||
|
The little packet looks up at you, hoping you can help it find the way. What letters will it see (in the order it would see them) if it follows the path? (The routing diagram is very wide; make sure you view it without line wrapping.)
|
||||||
|
|
||||||
157
2017/day/19/src/main.rs
Normal file
157
2017/day/19/src/main.rs
Normal file
|
|
@ -0,0 +1,157 @@
|
||||||
|
use std::io::Read;
|
||||||
|
use std::fs::File;
|
||||||
|
use std::ops::{Add, Sub};
|
||||||
|
|
||||||
|
enum Direction {
|
||||||
|
Up,
|
||||||
|
Down,
|
||||||
|
Left,
|
||||||
|
Right
|
||||||
|
}
|
||||||
|
|
||||||
|
use Direction::*;
|
||||||
|
|
||||||
|
impl Direction {
|
||||||
|
fn left(&self) -> Direction {
|
||||||
|
match *self {
|
||||||
|
Up => Left,
|
||||||
|
Down => Right,
|
||||||
|
Left => Down,
|
||||||
|
Right => Up
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn right(&self) -> Direction {
|
||||||
|
match *self {
|
||||||
|
Up => Right,
|
||||||
|
Down => Left,
|
||||||
|
Left => Up,
|
||||||
|
Right => Down
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
trait Move: Add + Sub + Sized {
|
||||||
|
fn move_x(&self, direction: &Direction) -> Self;
|
||||||
|
fn move_y(&self, direction: &Direction) -> Self;
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Move for usize {
|
||||||
|
fn move_x(&self, direction: &Direction) -> Self {
|
||||||
|
match *direction {
|
||||||
|
Up | Down => *self,
|
||||||
|
Left => self - 1,
|
||||||
|
Right => self + 1,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn move_y(&self, direction: &Direction) -> Self {
|
||||||
|
match *direction {
|
||||||
|
Up => self - 1,
|
||||||
|
Down => self + 1,
|
||||||
|
Left | Right => *self,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
struct Diagram {
|
||||||
|
data: Vec<u8>,
|
||||||
|
width: usize,
|
||||||
|
height: usize,
|
||||||
|
stride: usize,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Diagram {
|
||||||
|
fn new(data: Vec<u8>) -> Self {
|
||||||
|
let width = data.iter().position(|&b| b == 0x0A).expect("no newlines?"); // \n
|
||||||
|
let stride = width + 1; // Theres 1 byte of padding (the newline on every row)
|
||||||
|
let height = data.len() / stride;
|
||||||
|
|
||||||
|
Diagram { data, width, height, stride }
|
||||||
|
}
|
||||||
|
|
||||||
|
fn char_at(&self, row: usize, col: usize) -> char {
|
||||||
|
self.data[row * self.stride + col] as char
|
||||||
|
}
|
||||||
|
|
||||||
|
fn start_col(&self) -> usize {
|
||||||
|
self.data.iter().position(|&b| b == 0x7C).expect("unable to find start position") // |
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn main() {
|
||||||
|
let mut input = Vec::new();
|
||||||
|
let mut file = File::open("input").expect("unable to open input file");
|
||||||
|
file.read_to_end(&mut input).expect("error reading input");
|
||||||
|
|
||||||
|
let diagram = Diagram::new(input);
|
||||||
|
|
||||||
|
println!("{}", navigate(&diagram));
|
||||||
|
}
|
||||||
|
|
||||||
|
// This is pretty ugly... can be improved
|
||||||
|
fn navigate(diagram: &Diagram) -> String {
|
||||||
|
let mut col = diagram.start_col();
|
||||||
|
let mut row = 0;
|
||||||
|
let mut direction = Down;
|
||||||
|
|
||||||
|
let mut path = String::new();
|
||||||
|
|
||||||
|
loop {
|
||||||
|
let c = diagram.char_at(row, col);
|
||||||
|
// println!("Visit ({}, {}): '{}'", col, row, c);
|
||||||
|
|
||||||
|
if c >= 'A' && c <= 'Z' {
|
||||||
|
path.push(c);
|
||||||
|
}
|
||||||
|
|
||||||
|
// Try continuing in the same direction
|
||||||
|
let next_col = col.move_x(&direction);
|
||||||
|
let next_row = row.move_y(&direction);
|
||||||
|
if diagram.char_at(next_row, next_col) != ' ' {
|
||||||
|
row = next_row;
|
||||||
|
col = next_col;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
// Try turning left
|
||||||
|
let left = direction.left();
|
||||||
|
let next_col = col.move_x(&left);
|
||||||
|
let next_row = row.move_y(&left);
|
||||||
|
if diagram.char_at(next_row, next_col) != ' ' {
|
||||||
|
row = next_row;
|
||||||
|
col = next_col;
|
||||||
|
direction = left;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
// Try turning right
|
||||||
|
let right = direction.right();
|
||||||
|
let next_col = col.move_x(&right);
|
||||||
|
let next_row = row.move_y(&right);
|
||||||
|
if diagram.char_at(next_row, next_col) != ' ' {
|
||||||
|
row = next_row;
|
||||||
|
col = next_col;
|
||||||
|
direction = right;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
path
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn test_example() {
|
||||||
|
let data = b" |
|
||||||
|
| +--+
|
||||||
|
A | C
|
||||||
|
F---|----E|--+
|
||||||
|
| | | D
|
||||||
|
+B-+ +--+
|
||||||
|
";
|
||||||
|
let diagram = Diagram::new(data.to_vec());
|
||||||
|
|
||||||
|
assert_eq!(navigate(&diagram), "ABCDEF".to_string())
|
||||||
|
}
|
||||||
Loading…
Reference in a new issue