[rust][10.0]

wip
Alpha Chen 9 years ago
parent 4f8fec975b
commit 9795f16bec

@ -0,0 +1 @@
1113122113

@ -0,0 +1,59 @@
#[test]
fn test_day_10() {
let mut foo = LookAndSay { seq: vec![2, 1, 1] };
assert_eq!(vec![1, 2, 2, 1], foo.next().unwrap());
foo = LookAndSay { seq: vec![1] };
assert_eq!(vec![1, 1], foo.next().unwrap());
assert_eq!(vec![2, 1], foo.next().unwrap());
assert_eq!(vec![1, 2, 1, 1], foo.next().unwrap());
assert_eq!(vec![1, 1, 1, 2, 2, 1], foo.next().unwrap());
assert_eq!(vec![3, 1, 2, 2, 1, 1], foo.next().unwrap());
}
pub fn solve(input: &str) -> usize {
let seq = input
.chars()
.map(|c| c.to_digit(10).unwrap() as usize)
.collect::<Vec<usize>>();
let mut look_and_say = LookAndSay { seq: seq };
for _ in 0..40 {
look_and_say.next();
}
look_and_say.seq.len()
}
struct LookAndSay {
seq: Vec<usize>,
}
impl Iterator for LookAndSay {
type Item = Vec<usize>;
fn next(&mut self) -> Option<Vec<usize>> {
let mut s = Vec::new();
let mut digit = self.seq[0];
let mut count = 0;
for &i in &self.seq {
if i != digit {
s.push(count);
s.push(digit);
digit = i;
count = 1;
} else {
count += 1;
}
}
s.push(count);
s.push(digit);
self.seq = s.clone();
Some(s)
}
}

@ -13,3 +13,4 @@ pub mod day_06;
pub mod day_07; pub mod day_07;
pub mod day_08; pub mod day_08;
pub mod day_09; pub mod day_09;
pub mod day_10;

@ -7,5 +7,5 @@ use advent_of_code::*;
fn main() { fn main() {
let mut input = String::new(); let mut input = String::new();
io::stdin().read_to_string(&mut input).ok(); io::stdin().read_to_string(&mut input).ok();
println!("{}", day_09::solve(&input)); println!("{}", day_10::solve(&input));
} }

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