Plus Minus in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct]

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Introduction To Algorithm

The word Algorithm means “a process or set of rules to be followed in calculations or other problem-solving operations”. Therefore Algorithm refers to a set of rules/instructions that step-by-step define how a work is to be executed upon in order to get the expected results. 

Advantages of Algorithms:

  • It is easy to understand.
  • Algorithm is a step-wise representation of a solution to a given problem.
  • In Algorithm the problem is broken down into smaller pieces or steps hence, it is easier for the programmer to convert it into an actual program.

Link for the ProblemPlus Minus – Hacker Rank Solution

Plus Minus– Hacker Rank Solution

Problem:

Given an array of integers, calculate the ratios of its elements that are positivenegative, 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  are acceptable.

Example

image 41
0.400000
0.400000
0.200000

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  digits after the decimal. The function should not return a value.

Input Format

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

Constraints

image 43

Output Format

Print the following  lines, each to  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

image 42
Plus Minus – Hacker Rank Solution
import java.util.Scanner;

/**
 * 
 * @author Techno-RJ
 *
 */
public class PlusMinus {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		int arr[] = new int[n];
		float countPositive = 0;
		float countNegetive = 0;
		float countZero = 0;
		for (int arr_i = 0; arr_i < n; arr_i++) {
			arr[arr_i] = in.nextInt();
			if (arr[arr_i] < 0) {
				countNegetive++;
			}
			if (arr[arr_i] > 0) {
				countPositive++;
			}
			if (arr[arr_i] == 0) {
				countZero++;
			}
		}
		System.out.printf("%1.6f \n", countPositive / n);
		System.out.printf("%1.6f \n", countNegetive / n);
		System.out.printf("%1.6f \n", countZero / n);
		in.close();
	}
}

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