PlusMinus.cs

// Given an array of integers, calculate the fractions of its elements that are positive, negative, and are zeros. Print the decimal value of each fraction on a new line.

// Note: This challenge introduces precision problems. The test cases are scaled to six decimal places, though answers with absolute error of up to  are acceptable.

// Input Format

// The first line contains an integer, , denoting the size of the array. 
// The second line contains  space-separated integers describing an array of numbers .

// Output Format

// You must print the following  lines:

// A decimal representing of the fraction of positive numbers in the array compared to its size.
// A decimal representing of the fraction of negative numbers in the array compared to its size.
// A decimal representing of the fraction of zeros in the array compared to its size.
// Sample Input

// 6
// -4 3 -9 0 4 1         
// Sample Output

// 0.500000
// 0.333333
// 0.166667
// Explanation

// There are  positive numbers,  negative numbers, and  zero in the array. 
// The proportions of occurrence are positive: , negative:  and zeros: .

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

class Solution {

    /*
     * Complete the plusMinus function below.
     */
    static void plusMinus(int[] arr) {
        /*
         * Write your code here.
         */
        var arrLength = arr.Length;
        var posCount = 0;
        var negCount = 0;
        var zeroCount = 0;
        decimal posFraction = 0;
        decimal negFraction = 0;
        decimal zeroFraction = 0;
        
        foreach (var element in arr ) {
            if (element > 0) {
                posCount++; 
            } else if (element < 0) {
                negCount++;
            } else {
                zeroCount++;
            }           
        }              
        posFraction = (decimal)posCount / (decimal)arrLength;
        negFraction = (decimal)negCount / (decimal)arrLength;
        zeroFraction = (decimal)zeroCount / (decimal)arrLength;
        
        Console.Out.WriteLine(posFraction.ToString("N6"));
        Console.Out.WriteLine(negFraction.ToString("N6"));                          
        Console.Out.WriteLine(zeroFraction.ToString("N6"));
    }

    static void Main(string[] args) {
        int n = Convert.ToInt32(Console.ReadLine());

        int[] arr = Array.ConvertAll(Console.ReadLine().Split(' '), arrTemp => Convert.ToInt32(arrTemp))
        ;
        plusMinus(arr);
    }
}