Question

Please use Java eclipse

Find pair in an array with given sum

Given an array of integers A and an integer S, determines whether there exist two elements in the array whose sum is exactly equal to S or not.

Display 1 a pair is found in an array with matching sum S else 0.

Input
    6
    5
    1 -2 3 8 7

    Where,

• First line represents integer S.
• Second line represents the size of an array.
• Third line represents array elements separated by single space.

Output
    1

For the given array, A[1] + A[3] = -2 + 8 = 6 which is equal to the given number S=6

Answer 1

Java Program:  Change the class name as per your convenient

import java.util.Scanner;

public class Main
{
        public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
                System.out.print("Enter Sum S : ");
                int S = sc.nextInt();
                System.out.print("Enter Size of Array : ");
                int N = sc.nextInt();
                System.out.print("Enter Elements of Array : ");
                int A[] = new int[N];
                for (int i=0; i<N; i++)
                {
                    A[i] = sc.nextInt();
                }
                
                int flag = 0;
                
                for (int i=0; i<N; i++)
                {
                    for (int j=i+1; j<N; j++)
                    {
                        if((A[i] + A[j]) == S)
                        {
                            flag = 1;
                        }
                    }
                }
                
                if (flag == 1)
                {
                    System.out.println("Your Output : 1");
                }
                else{
                    System.out.println("Your Output : 0");
                }
        }
}

Output:

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