To find the total number of pairs in an array whose sum equals a target value x, one efficient approach is to use a hash map (or dictionary) to track

enter the total elements : 4 enter the number X : 12 enter the elements value 0 : 1 enter the elements value 1 : 2 enter the elements value 2 : 6 enter the elements value 3 : 6 pair is : 6,6 Process exited after 9.802 seconds with return value