Plus Minus

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.

For example, given the array arr = [1, 1, 0, -1, -1] there are 5 elements, two positive, two negative and one zero. Their ratios would be , and . It should be printed as

1
2
3

0.400000
0.400000
0.200000

Function Description

Complete the plusMinus function in the editor below. It should print out the ratio of positive, negative and zero items in the array, each on a separate line rounded to six decimals.

plusMinus has the following parameter(s):

• arr: an array of integers

Input Format

The first line contains an integer, n, denoting the size of the array.
The second line contains n space-separated integers describing an array of numbers arr=(arr[0], arr[1], arr[2], …, a[n-1]).

Constraints

Output Format

You must print the following 3 lines:

1. A decimal representing of the fraction of positive numbers in the array compared to its size.
2. A decimal representing of the fraction of negative numbers in the array compared to its size.
3. A decimal representing of the fraction of zeros in the array compared to its size.

Sample Input

1
2

6
-4 3 -9 0 4 1

Sample Output

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2
3

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: , negative: and zeros: .

Solution

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function diagonalDifference(arr) {
    // Write your code here
    return Math.abs(arr.reduce((target, item, index) => {
        let length = item.length - 1;
        return target + item[index] - item[length - index]
    }, 0));
}