Description: Zhang s son as a student, to a sufficient number of venues to arrange a number of activities, colleagues and want to use the venue
As little as possible.
The first line a positive integer k (1 < k < 10000), indicates the number of events to be arranged. Then there are k rows,
Each row has two positive integer representing the start time of the k-th activity and end time, time calculation starts 0 per minute
More than 1 clock.
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activity.cpp