Two Classes

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Problem description. Aditya who is a very good teacher.He has to take N number of classes but due to his busy schedule he decides to go only for any of the two classes.He knows starting and ending time of each class. Now he wants to know in how many ways he can select these two classes. Output your answer % (109+7). Note:- 1. It takes 0 time units to move from one class to the other class. 2.

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solution.cppC++17

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