aoc2015day3_rs

use std::fs;
use std::collections::HashSet;
use std::borrow::BorrowMut;

#[derive(Eq)]
#[derive(PartialEq)]
#[derive(Hash)]
struct Coordinate {
    x: i64,
    y: i64
}

impl Coordinate {
    fn new(x: i64, y: i64) -> Coordinate {
        Coordinate {
            x,
            y
        }
    }
}

fn main() {
    println!("AoC 2015, Day 3");

    let string = fs::read_to_string("/home/michelle/AoC_2015/Day_3/input.txt")
        .expect("Error reading the file!");
    let mut set: HashSet<Coordinate> = HashSet::new();
    let mut set_2: HashSet<Coordinate> = HashSet::new();
    let mut santa = Coordinate::new(0, 0);
    let mut santa_2 = Coordinate::new(0, 0);
    let mut robo_santa = Coordinate::new(0, 0);
    let mut is_santa = true;

    for i in string.chars() {
        let current = if is_santa {
            santa_2.borrow_mut()
        } else {
            robo_santa.borrow_mut()
        };

        match i {
            '^' => {
                santa.y += 1;
                current.y += 1
            },
            '>' => {
                santa.x += 1;
                current.x += 1
            },
            'v' => {
                santa.y -= 1;
                current.y -= 1
            },
            '<' => {
                santa.x -= 1;
                current.x -= 1
            },
            _   => ()
        }

        is_santa = !is_santa;

        set.insert(Coordinate::new(santa.x, santa.y));
        set_2.insert(Coordinate::new(current.x, current.y));
    }

    println!("Part 1: {}", set.len());
    println!("Part 2: {}", set_2.len());
}