Count Pairs with given Sum

 

Program -

public class pairSum{

     public static void main(String []args){
        int[] arr = { 1, 5, 7, -1, 5 };
        int sum = 6,count = 0;
        
        for (int i = 0; i < arr.length; i++)
        {    
            for (int j = i + 1; j < arr.length; j++)
            {
                if ((arr[i] + arr[j]) == sum)
                    count++;     
            }
        }
        System.out.println(count);
     }
}

 

Video explanation -