Help formatting files in c++ to make comparisons?

The first task is very simple, but do you want to display it so or you want to show it in a file or just want the ordered pairs for future computations ? For the second task, storing in arrays is OK, but since you say the actual file has many, the actual rough estimate number of them would help, as arrays would not be very efficient in comparison. If you can give me the exact question/requirement end to end, I can give you code in either C++, Java or C#, your choice.