407991: GYM102961 E Restaurant Customers

You are given the arrival and leaving times of $$$n$$$ customers in a restaurant.

What was the maximum number of customers?

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.

Constraints:

• $$$1 \le n \le 2 \cdot 10^5$$$
• $$$1 \le a \le b \le 10^9$$$

Print one integer: the maximum number of customers.

3
5 8
2 4
3 9

2