Решение задачи №285 от UniLecs

main.rs

fn split_consecutive_identical_str(s: &str) -> impl Iterator<Item = (u8, usize)> + '_ {
    split_consecutive_identical(s.as_bytes())
}

fn split_consecutive_identical(mut seq: &[u8]) -> impl Iterator<Item = (u8, usize)> + '_ {
    std::iter::from_fn(move || {
        let (&first, rest) = seq.split_first()?;
        let cut_off = rest
            .iter()
            .position(|&ch| ch != first)
            .unwrap_or(rest.len());
        seq = &rest[cut_off..];
        Some((first, cut_off + 1))
    })
}

fn is_long_pressed(original: &str, typed: &str) -> bool {
    let mut original = split_consecutive_identical_str(original);
    original
        .by_ref()
        .zip(split_consecutive_identical_str(typed))
        .all(|((ch1, rep1), (ch2, rep2))| ch1 == ch2 && rep2 >= rep1)
        && original.next().is_none()
}

fn main() {
    let test_cases = [
        ("albert", "albert", true),
        ("albert", "aaalberrt", true),
        ("lee", "lle", false),
    ];
    for (original, typed, expected_outcome) in test_cases {
        assert!(is_long_pressed(original, typed) == expected_outcome);
    }
}

Условия