fun plusMinus(arr: Array<Int>): Unit {
    var zero: Double = 0.0
    var positive: Double = 0.0
    var negative: Double = 0.0
    
    for (n in arr){
        if (n > 0){
            positive++
        } else if (n <0){
            negative++
        } else {
            zero++
        }
    }
    println(String.format("%.6f", (positive / arr.size).toDouble()))
    println(String.format("%.6f", (negative / arr.size).toDouble()))
    println(String.format("%.6f", (zero / arr.size).toDouble()))
}