Java Array Exercises: Find all combination of four elements of an given array whose sum is equal to a given value

Java Array: Exercise-43 with Solution

Write a Java program to find all combination of four elements of an given array whose sum is equal to a given value.

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.*;
import java.lang.*;
public class Main
{
   public static void main (String[] args) 
    {  
      int nums[] = {10, 20, 30, 40, 1, 2};
      int n = nums.length;
      // given value
      int s = 53;
       System.out.println("Given value: "+s);
        System.out.print("Combination of four elements:");  
        // Find other three elements after fixing first element
        for (int i = 0; i < n - 3; i++) 
        {
          // Find other two elements after fixing second element
            for (int j = i + 1; j < n - 2; j++) 
            {
           // Find the fourth element after fixing third element    
              for (int k = j + 1; k < n - 1; k++) 
                {
            // find the fourth
                    for (int l = k + 1; l < n; l++) 
                    {
                        if (nums[i] + nums[j] + nums[k] + nums[l] == s) 
                            System.out.print("\n"+nums[i]+" "+nums[j]+" "+nums[k] 
                                                                 +" "+nums[l]);
                    }
                }
            }
    }
  }
}

Sample Output:

                                                                              
Given value: 53
Combination of four elements:
10 40 1 2
20 30 1 2

Flowchart:

Java Code Editor:

Improve this sample solution and post your code through Disqus

Previous: Write a Java program to segregate all 0s on left side and all 1s on right side of a given array of 0s and 1s.
Next: Write a Java program to count the number of possible triangles from an given unsorted array of positive integers.