Hackerrank | Plus Minus Problem

Given an array of integers, calculate the ratios of its elements that are positive,  negative, and zero. Print the decimal value of each fraction on a new line with  places after the decimal.

Note: This challenge introduces precision problems. The test cases are scaled to six decimal places, though answers with absolute error of up to  10^-4 are acceptable.

Example arr=[1,1,0,-1,-1]

There are  n=5 elements, two positive(1,1), two negative(-1,-1) and one zero(0). Their ratios are  2/5,2/5  and1/5  . Results are printed as:

0.400000
0.400000
0.200000

Function Description

Function Description

Complete the plusMinus function in the editor below.

plusMinus has the following parameter(s):

• int arr[n]: an array of integers

Print
Print the ratios of positive, negative and zero values in the array. Each value should be printed on a separate line with  6 digits after the decimal. The function should not return a value.

Input Format

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

Constraints

Output Format

Print the following 3 lines, each to 6 decimals:

1. proportion of positive values
2. proportion of negative values
3. proportion of zeros

Sample Input

STDIN           Function
-----           --------
6               arr[] size n = 6
-4 3 -9 0 4 1   arr = [-4, 3, -9, 0, 4, 1]

Sample Output

0.500000
0.333333
0.166667

Explanation

There are 3 positive numbers,  2 negative numbers, and  1 zero in the array.
The proportions of occurrence are positive:  3/6=.500000, negative: 2/6=0.333333 and zeros: 1/6=0.166667 .

Implementation

#!/bin/python3

import math
import os
import random
import re
import sys

#
# Complete the 'plusMinus' function below.
#
# The function accepts INTEGER_ARRAY arr as parameter.
#

def plusMinus(arr):
    # Write your code here
    pos=0
    neg=0
    zero=0
    for i in arr:
        if i<0:
            neg=neg+1
        elif i>0:
            pos=pos+1
        else:
            zero=zero+1
            
    print(pos/len(arr),'\n',neg/len(arr),'\n',zero/len(arr)) 

if __name__ == '__main__':
    n = int(input().strip())

    arr = list(map(int, input().rstrip().split()))

    plusMinus(arr)

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