Plus Minus Hacker Rank Problem Solution

Plus Minus Hacker Rank Problem Solution
Plus Minus Hacker Rank Problem Solution

In this Hacker Rank Plus Minus problem solution, 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 6 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.


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

There are n = 5 elements, two positive, two negative and one zero. Their ratios are 2/5=0.400000, 2/5=0.400000 and 1/5=0.200000. Results are printed as:




Function Description

Complete the plusMinus function in the editor below.

plusMinus has the following parameter(s):

  • int arr[n]: an array of integers


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 n space-separated integers that describe .


  • 0 < n <= 100
  • -100 <= arr[i] <= 100

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

Plus Minus Hacker Rank Problem Solution JavaScript:

function plusMinus(arr) {
    let [negCount, zerCount, posCount] = [0, 0, 0];
    for (const num of arr) {
        if (num < 0) ++negCount;
        if (num == 0) ++zerCount;
        if (num > 0) ++posCount;

    console.log((posCount / arr.length).toFixed(6));
    console.log((negCount / arr.length).toFixed(6));
    console.log((zerCount / arr.length).toFixed(6));


Plus Minus Hacker Rank Problem Solution Python:

def plusMinus(arr):
n = len(arr)
cnt = arr.count(0)
if cnt == 0:
idx = sorted(arr).index(0)
neg = idx / n
zeros = cnt / n
pos = 1 - neg - zeros