fn plusMinus(arr: &[i32]) {
    
    let mut a = 0;
    let mut b = 0;
    let mut c = 0;
    
    for i in 0..arr.len(){
            if arr[i] == 0 {
                a += 1
            }
            
            if arr[i] > 0{
                b += 1
            }
            
            if arr[i] < 0{
                c += 1
            }
           
        };
    let len_float = arr.len() as f64;
    let calc_a = a as f64 / len_float;
    let calc_b = b as f64 / len_float;
    let calc_c = c as f64 / len_float;
    
    println!("{:.6}", calc_b);
    println!("{:.6}", calc_c);
    println!("{:.6}", calc_a);
}