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79 lines
1.7 KiB
79 lines
1.7 KiB
8 years ago
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use errors::*;
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pub fn solve(input: &str) -> Result<String> {
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Ok(input.lines()
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.map(|x| IP7::new(x))
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.filter(IP7::supports_tls)
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.count()
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.to_string())
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}
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pub struct IP7 {
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supernets: Vec<String>,
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hypernets: Vec<String>,
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}
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impl IP7 {
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fn new(s: &str) -> Self {
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let mut current = String::new();
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let mut supernets = Vec::new();
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let mut hypernets = Vec::new();
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for c in s.chars() {
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match c {
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'[' => {
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supernets.push(current);
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current = String::new();
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}
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']' => {
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hypernets.push(current);
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current = String::new();
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}
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c => current.push(c),
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}
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}
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supernets.push(current);
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IP7 {
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supernets: supernets,
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hypernets: hypernets,
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}
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}
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fn supports_tls(&self) -> bool {
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self.supernets.iter().any(|x| Self::abba(x)) &&
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self.hypernets.iter().all(|x| !Self::abba(x))
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}
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fn abba(s: &str) -> bool {
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let v: Vec<_> = s.chars().collect();
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v.windows(4).any(|w| (w[0] != w[1]) && (w[0] == w[3]) && (w[1] == w[2]))
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_new() {
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let ip = IP7::new("abba[mnop]qrst");
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assert_eq!(ip.supernets, vec!["abba".to_string(), "qrst".to_string()]);
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assert_eq!(ip.hypernets, vec!["mnop".to_string()]);
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}
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#[test]
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fn test_abba() {
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assert!(IP7::abba("abba"));
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assert!(!IP7::abba("abcd"));
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}
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#[test]
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fn test_supports_tls() {
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assert_eq!(IP7::new("abba[mnop]qrst").supports_tls(), true);
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assert_eq!(IP7::new("abcd[bddb]xyyx").supports_tls(), false);
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assert_eq!(IP7::new("aaaa[qwer]tyui").supports_tls(), false);
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assert_eq!(IP7::new("ioxxoj[asdfgh]zxcvbn").supports_tls(), true);
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}
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}
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