Java Subarray – Hacker Rank Solution

Java Subarray - Hacker Rank Solution
Java Subarray- Hacker Rank Solution

Problem :

We define the following:

  • subarray of an -element array is an array composed from a contiguous block of the original array’s elements. For example, if , then the subarrays are , , , , , and . Something like  would not be a subarray as it’s not a contiguous subsection of the original array.
  • The sum of an array is the total sum of its elements.
    • An array’s sum is negative if the total sum of its elements is negative.
    • An array’s sum is positive if the total sum of its elements is positive.

Given an array of  integers, find and print its number of negative subarrays on a new line.

Problem Statement; Click Here.



Java Subarray- Hacker Rank Solution

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
    public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
    int length = sc.nextInt();
    int[] arr = new int[length];
    int first = sc.nextInt();
    arr[0] = first;
    int count = first < 0 ? 1 : 0;
    for (int i = 1; i < length; i++){
        int num = sc.nextInt();
        arr[i] = arr[i - 1] + num;
        if (arr[i] < 0){
            count++;
        }
        for (int j = 0; j < i; j++){
            int sub_result = arr[i] - arr[j];
            if (sub_result < 0){
                count++;
            }
        }
    }
    System.out.print(count);
    }
}

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