Java: Check if a given array contains a subarray with 0 sum

Last update on May 09 2025 12:51:29 (UTC/GMT +8 hours)

54. Check if array contains a subarray with sum zero

Write a Java program to check if a given array contains a subarray with 0 sum.

Example:
Input :
nums1= { 1, 2, -2, 3, 4, 5, 6 }
nums2 = { 1, 2, 3, 4, 5, 6 }
nums3 = { 1, 2, -3, 4, 5, 6 }
Output:
Does the said array contain a subarray with 0 sum: true
Does the said array contain a subarray with 0 sum: false
Does the said array contain a subarray with 0 sum: true

Sample Solution:

Java Code:

// Import the necessary Java utility classes.
import java.util.Set;
import java.util.HashSet;
import java.util.Arrays;

// Define a class named 'solution'.
class solution
{
    // A method to find if there exists a subarray with a sum of zero.
    public static Boolean find_subarray_sum_zero(int[] nums)
    {
        // Create a HashSet to store the cumulative sum of elements.
        Set set = new HashSet<>();
        set.add(0);
        int suba_sum = 0;

        // Iterate through the elements of the array.
        for (int i = 0; i < nums.length; i++)
        {            
            suba_sum += nums[i];

            // If the cumulative sum already exists in the set, return true.
            if (set.contains(suba_sum)) {
                return true;
            }
            
            // Add the cumulative sum to the set.
            set.add(suba_sum);
        }

        // If no subarray with a sum of zero is found, return false.
        return false;
    }

    public static void main (String[] args)
    {
        // Define an array 'nums1'.
        int[] nums1 = { 1, 2, -2, 3, 4, 5, 6 };
        System.out.println("Original array: " + Arrays.toString(nums1));
        
        // Check if the array contains a subarray with a sum of zero and print the result.
        System.out.println("Does the said array contain a subarray with 0 sum: " + find_subarray_sum_zero(nums1));

        // Define another array 'nums2'.
        int[] nums2 = { 1, 2, 3, 4, 5, 6 };
        System.out.println("\nOriginal array: " + Arrays.toString(nums2));
        
        // Check if the array contains a subarray with a sum of zero and print the result.
        System.out.println("Does the said array contain a subarray with 0 sum: " + find_subarray_sum_zero(nums2));

        // Define yet another array 'nums3'.
        int[] nums3 = { 1, 2, -3, 4, 5, 6 };
        System.out.println("\nOriginal array: " + Arrays.toString(nums3));
        
        // Check if the array contains a subarray with a sum of zero and print the result.
        System.out.println("Does the said array contain a subarray with 0 sum: " + find_subarray_sum_zero(nums3));
    }
}

Sample Output:

                                                                              
Original array: [1, 2, -2, 3, 4, 5, 6]
Does the said array contain a subarray with 0 sum: true

Original array: [1, 2, 3, 4, 5, 6]
Does the said array contain a subarray with 0 sum: false

Original array: [1, 2, -3, 4, 5, 6]
Does the said array contain a subarray with 0 sum: true

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to find the largest subarray with a given sum in an array.
• Write a Java program to find the longest subarray whose sum is divisible by a given number.
• Write a Java program to find all subarrays in an array whose sum equals a given target.
• Write a Java program to find the number of subarrays with a sum of zero.

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