fn main() {
    const TARGET: usize = 40;

    let (f, b, o) = fizz_buzz(TARGET, 3, 5);

    for i in 0..f.len() {

        println!("{:02} {}{}{}", i,
            if f[i] { "fizz " } else { "     " },
            if b[i] { "buzz " } else { "     " },
            if o[i] || i < 1 { "" } else { "oops" })
    }
}

fn fizz_buzz(target: usize, step_1: usize, step_2: usize) -> (Vec<bool>, Vec<bool>, Vec<bool>) {
    let (mut fizz, mut buzz, mut oops) = (vec![false; target+1], vec![false; target+1], vec![false; target+1]);

    for i in 0..target+1 {
        if i % step_1 == 0 {
            fizz[i] = true;
        }
        if i % step_2 == 0 {
            buzz[i] = true;
        }
        if !oops[i] && i > 1 {
            for j in (2*i..target+1).step_by(i) {
                oops[j] = true;
            }
        }
    }

    (fizz, buzz, oops)
}