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//! # 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:
//!
//! ```txt
//!      |
//!      |  +--+
//!      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.)

use anyhow::Result;

pub const INPUT: &str = include_str!("d19.txt");

pub fn solve_part_one(input: &str) -> Result<i64> {
    Ok(0)
}

pub fn solve_part_two(input: &str) -> Result<i64> {
    Ok(0)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn part_one() {}

    #[test]
    fn part_two() {}
}