Solving Plus Minus Problem in Python (HackerRank ) .

Sachin Nayak — Thu, 28 Aug 2025 06:43:53 +0000

Problem Description:
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.

Solution:

def plusMinus(arr):
    n = len(arr)  # Total number of elements
    pos = sum(1 for x in arr if x > 0)  # Count positives
    neg = sum(1 for x in arr if x < 0)  # Count negatives
    zero = n - pos - neg  # Remaining are zeros

    # Print ratios with 6 decimal places
    print(f"{pos / n:.6f}")
    print(f"{neg / n:.6f}")
    print(f"{zero / n:.6f}")


# Example usage:
arr = list(map(int, input("Enter the elements of the array separated by space: ").split()))
plusMinus(arr)

Example Run :
Input:
-4 3 -9 0 4 1

Output:
0.500000
0.333333
0.166667

How the Solution Works
1.Count the elements by type
Go through the array and count how many numbers are:

Positive (greater than 0)
Negative (less than 0)
Zero

2.Calculate ratios
Divide each count by the total number of elements in the array.

Positive ratio = (number of positive elements) ÷ (total elements)
Negative ratio = (number of negative elements) ÷ (total elements)
Zero ratio = (number of zeros) ÷ (total elements)

3.Format the output
Print each ratio on a new line with exactly 6 decimal places.

Forem: Sachin Nayak

Solving Plus Minus Problem in Python (HackerRank ) .