pub fn task1() {
    let input: usize = 509671;

    let mut scores = vec![3, 7];
    let mut recipes = vec![0, 1];

    while scores.len() < input + 10 {
        let mut score: usize = recipes.iter().map(|recipe| scores[*recipe]).sum();
        if score >= 10 {
            scores.push(1);
            score -= 10;
        }
        scores.push(score);

        for recipe in recipes.iter_mut() {
            *recipe = (*recipe + 1 + scores[*recipe]) % scores.len();
        }
    }

    let result = scores[input..input + 10]
        .iter()
        .map(|s| s.to_string())
        .collect::<String>();
    println!("Last 10 for {}: {}", input, result);
}

pub fn task2() {
    let input = vec![5, 0, 9, 6, 7, 1];

    let mut scores = vec![3, 7];
    let mut recipes = vec![0, 1];

    while scores.len() < 7
        || scores[scores.len() - 6..] != input[..]
            && scores[scores.len() - 7..scores.len() - 1] != input[..]
    {
        let mut score: usize = recipes.iter().map(|recipe| scores[*recipe]).sum();
        if score >= 10 {
            scores.push(1);
            score -= 10;
        }
        scores.push(score);

        for recipe in recipes.iter_mut() {
            *recipe = (*recipe + 1 + scores[*recipe]) % scores.len();
        }
    }

    if scores[scores.len() - 6..] != input[..] {
        println!("{}", scores.len() - 7)
    } else {
        println!("{}", scores.len() - 8)
    }
    // 20227890 too high
}