Restaurant Customers
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Description
You are given the arrival and leaving times of n customers in a restaurant.
What was the maximum number of customers in the restaurant at any time?
Input Format
The first input line has an integer n: the number of customers.
After this, there are n lines that describe the customers. Each line has two integers a and b: the arrival and leaving times of a customer.
You may assume that all arrival and leaving times are distinct.
Output Format
Print one integer: the maximum number of customers.3
5 8
2 4
3 92