[2018][rust][2.0]

sorbet
Alpha Chen 6 years ago
parent a0ac96a8ea
commit af6a02c6a2

@ -0,0 +1,52 @@
pub fn solve(input: &str) -> String {
let box_ids: Vec<_> = input.lines().map(BoxId::new).collect();
let two_count = box_ids.iter().filter(|&x| x.is_two()).count();
let three_count = box_ids.iter().filter(|&x| x.is_three()).count();
(two_count * three_count).to_string()
}
struct BoxId(String);
impl BoxId {
fn new(s: &str) -> Self {
BoxId(s.into())
}
fn is_two(&self) -> bool {
self.is_n(2)
}
fn is_three(&self) -> bool {
self.is_n(3)
}
fn is_n(&self, n: usize) -> bool {
self.0
.chars()
.any(|x| self.0.chars().filter(|&y| x == y).count() == n)
}
}
#[test]
fn test_is_two() {
assert_eq!(BoxId::new("abcdef").is_two(), false);
assert_eq!(BoxId::new("bababc").is_two(), true);
assert_eq!(BoxId::new("abbcde").is_two(), true);
assert_eq!(BoxId::new("abcccd").is_two(), false);
assert_eq!(BoxId::new("aabcdd").is_two(), true);
assert_eq!(BoxId::new("abcdee").is_two(), true);
assert_eq!(BoxId::new("ababab").is_two(), false);
}
#[test]
fn test_is_three() {
assert_eq!(BoxId::new("abcdef").is_three(), false);
assert_eq!(BoxId::new("bababc").is_three(), true);
assert_eq!(BoxId::new("abbcde").is_three(), false);
assert_eq!(BoxId::new("abcccd").is_three(), true);
assert_eq!(BoxId::new("aabcdd").is_three(), false);
assert_eq!(BoxId::new("abcdee").is_three(), false);
assert_eq!(BoxId::new("ababab").is_three(), true);
}

@ -1,11 +1,12 @@
use std::io::{self, Read}; use std::io::{self, Read};
mod day_01; mod day_01;
mod day_02;
fn main() { fn main() {
let mut input = String::new(); let mut input = String::new();
io::stdin().read_to_string(&mut input).unwrap(); io::stdin().read_to_string(&mut input).unwrap();
let output = day_01::solve_1(&input, "\n"); let output = day_02::solve(&input);
println!("{}", output); println!("{}", output);
} }

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