Server requests
There are
n requests to a server that we’re anticipating. Each of those requests will happen at some time We would like to know what is the maximum number of concurrent requests that the server should be able to handle.
Input
The first line of the input contains a single integer
n (1 ≤ n ≤ ).The next
n lines contain pairs of Output
The program should print a single integer - the maximum number of concurrent requests the server needs to be able to handle.
Examples
Input | Output |
5
1 2
1 4
2 2
3 1
2 1 | 4 |
Explanation
1 | 1 | ㅤ | ㅤ |
2 | 2 | 2 | 2 |
ㅤ | 3 | 3 | ㅤ |
ㅤ | ㅤ | 4 | ㅤ |
ㅤ | 5 | ㅤ | ㅤ |
Each number represents the request number. The cells marked with that number are the execution of that request on the server.
Constraints
Time limit: 2 seconds
Memory limit: 512 MB
Output limit: 1 MB