public static void plusMinus(List<int> arr)
{
//Console.Write(arr.Count);
var n = arr.Count;
float plus =0, minus=0,zero=0;
foreach(var item in arr){
if(item == 0){
zero++;
}
if(item>0){
plus++;
}
if(item<0){
minus++;
}
}
float dPlus, dMin, dZero;
dPlus = plus/n;
Console.WriteLine(Math.Round(dPlus,6));
dMin = minus/n;
Console.WriteLine(Math.Round(dMin,6));
dZero = zero/n;
Console.WriteLine(Math.Round(dZero,6));
}