PlusMinus.java

/*Problem: Plus Minus
Given an array of integers, calculate the ratios of its elements that are positive, negative, and zero. Print the decimal value of each ratio on a new line with six decimal places.

Function Description
Complete the function plusMinus in the editor below.

The function plusMinus has the following parameter(s):

int arr[n]: an array of integers
Print
Print the following 3 lines, each to 6 decimal places:

The proportion of positive values in the array.
The proportion of negative values in the array.
The proportion of zeros in the array.

Input Format
The first line contains an integer, n, the size of the array. The second line contains n space-separated integers that describe the array arr[n].

Output Format
Print the following 3 lines, each to 6 decimal places:

The proportion of positive values
The proportion of negative values
The proportion of zeros

*/

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

class Result 
{
    /*
     * Complete the 'plusMinus' function below.
     *
     * The function accepts INTEGER_ARRAY arr as parameter.
     */
     
     public static void plusMinus(List<Integer> arr) 
     {
         // Write your code here
         int n = arr.size();
         int positiveNumbers = 0;
         int negativeNumbers = 0;
         int zeroNumbers = 0;
         
         for(int arrElement : arr)
         {
             if(arrElement > 0)
             {
                 positiveNumbers++;
             }
             
             else if(arrElement < 0)
             {
                 negativeNumbers++;
             }
             
             else
             {
                 zeroNumbers++;
             }
         }
         
         double positiveNumbersRatio = (double) positiveNumbers / n;
         double negativeNumbersRatio = (double) negativeNumbers / n;
         double zeroNumbersRatio = (double) zeroNumbers / n;
         
         System.out.printf("%.6f%n", positiveNumbersRatio);
         System.out.printf("%.6f%n", negativeNumbersRatio);
         System.out.printf("%.6f%n", zeroNumbersRatio);
     }
}

public class PlusMinus 
{
    public static void main(String[] args) throws IOException 
    {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));

        int n = Integer.parseInt(bufferedReader.readLine().trim());

        List<Integer> arr = Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
            .map(Integer::parseInt)
            .collect(toList());

        Result.plusMinus(arr);

        bufferedReader.close();
    }
}