fn solve()

in contests/agc022/agc022_a.rs [17:44]

• 22 lines of code
• 4 McCabe index (conditional complexity)

fn solve(src: &str) -> String {
    let source = AutoSource::from(src);

    input! {
        from source,
        S: String
    }
    let S: String = S;

    let mut words: HashSet<u8> = HashSet::new();
    let start_char = "a".as_bytes()[0];
    let end_char = "z".as_bytes()[0];

    for c in start_char..end_char {
        words.insert(c);
    }

    if S == "zyxwvutsrqponmlkjihgfedcba" {
        return format!("-1");
    }

    for s in S.chars() {
        words.remove(&s.to_string().as_bytes()[0]);
    }

    let sorted_words = words.into_iter().collect::<Vec<_>>();
    format!("{}{}", S, sorted_words[0].to_string())
}