// Santa was hoping for a white Christmas, but his weather machine's "snow" function is powered by
// stars, and he's fresh out! To save Christmas, he needs you to collect fifty stars by December
// 25th.
//
// Santa is trying to deliver presents in a large apartment building, but he can't find the right
// floor - the directions he got are a little confusing. He starts on the ground floor (floor 0)
// and then follows the instructions one character at a time.
//
// An opening parenthesis, (, means he should go up one floor, and a closing parenthesis, ), means
// he should go down one floor.
//
// The apartment building is very tall, and the basement is very deep; he will never find the top
// or bottom floors.
//
// For example:
//
// (()) and ()() both result in floor 0.
// ((( and (()(()( both result in floor 3.
// ))((((( also results in floor 3.
// ()) and ))( both result in floor -1 (the first basement level).
// ))) and )())()) both result in floor -3.
// To what floor do the instructions take Santa?
//

use aoc::read_data;

fn main() {
    let instructions = read_data("2015_01_data.txt");

    let mut current_floor = 0;
    for next_direction in instructions.chars() {
        match next_direction {
            ')' => current_floor -= 1,
            '(' => current_floor += 1,
            _ => {
                panic!("Invalid Direction.  Santa got lost.");
            }
        }
    }
    println!("Ending on floor {}", current_floor);
}
// 232