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author | June McEnroe <programble@gmail.com> | 2016-12-07 22:36:09 -0500 |
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committer | June McEnroe <programble@gmail.com> | 2016-12-07 22:36:09 -0500 |
commit | 6fb052d6adcf548011b842487e7bd88097f5184f (patch) | |
tree | b6dceeb43805f1d8731857e980cf6683c2d18672 /src/bin/day07.rs | |
parent | Day 7 (diff) | |
download | aoc-6fb052d6adcf548011b842487e7bd88097f5184f.tar.gz aoc-6fb052d6adcf548011b842487e7bd88097f5184f.zip |
Refactor day 7
Diffstat (limited to '')
-rw-r--r-- | src/bin/day07.rs | 59 |
1 files changed, 22 insertions, 37 deletions
diff --git a/src/bin/day07.rs b/src/bin/day07.rs index b2289f0..305fd8f 100644 --- a/src/bin/day07.rs +++ b/src/bin/day07.rs @@ -1,58 +1,43 @@ use std::io::{self, Read}; use std::str::FromStr; -struct Sequence { - sequence: String, - hypernet: bool, +fn has_abba(s: &str) -> bool { + s.as_bytes() + .windows(4) + .any(|window| { + window[0] == window[3] + && window[1] == window[2] + && window[0] != window[1] + }) } -impl Sequence { - fn has_abba(&self) -> bool { - self.sequence - .as_bytes() - .windows(4) - .any(|window| { - window[0] == window[3] - && window[1] == window[2] - && window[0] != window[1] - }) - } +#[derive(Default)] +struct Ip { + supernet: Vec<String>, + hypernet: Vec<String>, } -struct Ip(Vec<Sequence>); - impl Ip { fn supports_tls(&self) -> bool { - let any_abbas = self.0 - .iter() - .any(Sequence::has_abba); - - let any_hypernet_abbas = self.0 - .iter() - .filter(|sequence| sequence.hypernet) - .any(Sequence::has_abba); - - any_abbas && !any_hypernet_abbas + self.supernet.iter().any(|s| has_abba(s)) + && !self.hypernet.iter().any(|s| has_abba(s)) } } impl FromStr for Ip { type Err = (); fn from_str(s: &str) -> Result<Ip, ()> { - let mut sequences = Vec::new(); - let mut hypernet = false; + let mut ip = Ip::default(); - for sequence in s.split(|ch| ch == '[' || ch == ']') { - sequences.push( - Sequence { - sequence: sequence.to_owned(), - hypernet: hypernet - } - ); - hypernet = !hypernet; + for (i, seq) in s.split(|ch| ch == '[' || ch == ']').enumerate() { + if i % 2 == 0 { + ip.supernet.push(seq.to_owned()); + } else { + ip.hypernet.push(seq.to_owned()); + } } - Ok(Ip(sequences)) + Ok(ip) } } |