Give an array of integers and a target number, return two integers such that they add up to the specific target number.
The output is unique! You may not use the same element twice.
1. Each integer in the given array is a positive number and smaller than 1 million.
2. The target number is small than 1million.
The first line is the array's size.
The second line is the array of integers.
The third line is the target number.
The outputs are two integers from the input array that they add up to the target number.
The left number is smaller than the right one.