day04.rs

fn solution01() -> u64 {
    INPUT.iter().fold(0, |a, line| {
        let ref words: Vec<&str> = line.split_whitespace().collect();
        let uniq_words: BTreeSet<&&str> = words.into_iter().collect();
        if words.len() == uniq_words.len() {
            a + 1
        } else {
            a
        }
    })
}