170. Two Sum III - Data structure design:

The Essence: The aim of the question is to inform the problem-solver on how to design a class in the programming language of choice. It is a variant of the classical Two-Sum question.

Details: To implement the find method:

• We can sort the list in order to be able to use Binary Search.
• We can use a map implementation (for example HashMap) to use the number as a key and its complementary as a value.