fn main() {
    let mut papers = vec![4, 3, 0, 1, 5];

    papers.retain(|h| *h > 0);

    dbg!(&papers);

    let mut h_indices = Vec::new();

    for o_citations in &papers {
        let mut h = 0;

        for citation in &papers {
            if citation >= o_citations {
                h += 1;
            }
        }

        indices.push(h);
    }

    dbg!(indices);
}