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use std::io::{self, Read};
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum Keypad {
K1, K2, K3,
K4, K5, K6,
K7, K8, K9,
}
impl Keypad {
fn up(self) -> Self {
use Keypad::*;
match self {
K4 => K1, K5 => K2, K6 => K3,
K7 => K4, K8 => K5, K9 => K6,
_ => self,
}
}
fn down(self) -> Self {
use Keypad::*;
match self {
K1 => K4, K2 => K5, K3 => K6,
K4 => K7, K5 => K8, K6 => K9,
_ => self,
}
}
fn left(self) -> Self {
use Keypad::*;
match self {
K2 => K1, K3 => K2,
K5 => K4, K6 => K5,
K8 => K7, K9 => K8,
_ => self,
}
}
fn right(self) -> Self {
use Keypad::*;
match self {
K1 => K2, K2 => K3,
K4 => K5, K5 => K6,
K7 => K8, K8 => K9,
_ => self,
}
}
}
fn solve(input: &str) -> Vec<Keypad> {
let mut code = Vec::new();
let mut key = Keypad::K5;
for line in input.lines() {
for direction in line.chars() {
key = match direction {
'U' => key.up(),
'D' => key.down(),
'L' => key.left(),
'R' => key.right(),
_ => panic!("{} is not a direction", direction),
}
}
code.push(key);
}
code
}
fn main() {
let mut input = String::new();
io::stdin().read_to_string(&mut input).unwrap();
println!("Part 1: {:?}", solve(&input));
}
#[test]
fn part1() {
use Keypad::*;
assert_eq!(vec![K1, K9, K8, K5], solve("ULL\nRRDDD\nLURDL\nUUUUD"));
}
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