wip
Alpha Chen 9 years ago
parent af554e7bc8
commit 97b34cd57a

@ -1,4 +1,5 @@
use std::io::Error;
use std::str::Chars;
pub trait Day {
fn new(String) -> Self;
@ -15,6 +16,49 @@ impl Day for Day01 {
}
fn solve(self) -> Result<i32, Error> {
Ok(1)
let elevator = Elevator::new(self.input);
Ok(elevator.run().last().unwrap_or(0))
}
}
struct Elevator {
instructions: String,
}
impl<'a> Elevator {
fn new(input: String) -> Self {
Elevator { instructions: input }
}
fn run(self: &'a Self) -> ElevatorIterator<'a> {
ElevatorIterator {
chars: self.instructions.chars(),
floor: 0,
}
}
}
struct ElevatorIterator<'a> {
chars: Chars<'a>,
floor: i32,
}
impl<'a> Iterator for ElevatorIterator<'a> {
type Item = i32;
fn next(&mut self) -> Option<i32> {
match self.chars.next() {
Some('(') => {
self.floor += 1;
Some(self.floor)
},
Some(')') => {
self.floor -= 1;
Some(self.floor)
},
_ => {
None
},
}
}
}

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