Problem:
Score: 400 points

Problem Statement

In Takahashi Kingdom, there is a east-west railroad and N cities along it, numbered 1, 2, 3, ..., N from west to east.
A company called AtCoder Express possesses M trains, and the train i runs from City L_i to City R_i (it is possible that L_i = R_i).
Takahashi the king is interested in the following Q matters:

The number of the trains that runs strictly within the section from City p_i to City q_i, that is, the number of trains j such that p_i \leq L_j and R_j \leq q_i.

Although he is genius, this is too much data to process by himself. Find the answer for each of these Q queries to help him.

Constraints

N is an integer between 1 and 500 (inclusive).

M is an integer between 1 and 200 \ 000 (inclusive).

Q is an integer between 1 and 100 \ 000 (inclusive).

1 \leq L_i \leq R_i \leq N (1 \leq i \leq M)

1 \leq p_i \leq q_i \leq N (1 \leq i \leq Q)

Input

Input is given from Standard Input in the following format:

N M Q
L_1 R_1
L_2 R_2
:
L_M R_M
p_1 q_1
p_2 q_2
:
p_Q q_Q

Output

Print Q lines. The i-th line should contain the number of the trains that runs strictly within the section from City p_i to City q_i.

Sample Input 1

2 3 1
1 1
1 2
2 2
1 2

Sample Output 1

3

As all the trains runs within the section from City 1 to City 2, the answer to the only query is 3.

Sample Input 2

10 3 2
1 5
2 8
7 10
1 7
3 10

Sample Output 2

1
1

The first query is on the section from City 1 to 7. There is only one train that runs strictly within that section: Train 1.
The second query is on the section from City 3 to 10. There is only one train that runs strictly within that section: Train 3.

Sample Input 3

10 10 10
1 6
2 9
4 5
4 7
4 7
5 8
6 6
6 7
7 9
10 10
1 8
1 9
1 10
2 8
2 9
2 10
3 8
3 9
3 10
1 10

Sample Output 3

7
9
10
6
8
9
6
7
8
10

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Time Limit Exceeded)

import java.io.*;
import java.util.*;

public class Main {
	
	public static void main(String[] args) {
		int n = 0;
		int m = 0;
		int q = 0;
		int[][] lrs = null;
		int[][] pqs = null;
		
		try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
			String[] strs = br.readLine().split(" ");
			
			n = Integer.parseInt(strs[0]);
			m = Integer.parseInt(strs[1]);
			q = Integer.parseInt(strs[2]);
			
			lrs = new int[m][];
			for (int i = 0; i < m; i++) {
				strs = br.readLine().split(" ");
				lrs[i] = new int[] {
					Integer.parseInt(strs[0]),
					Integer.parseInt(strs[1]),
				};
			}
			
			pqs = new int[q][];
			for (int i = 0; i < q; i++) {
				strs = br.readLine().split(" ");
				pqs[i] = new int[] {
					Integer.parseInt(strs[0]),
					Integer.parseInt(strs[1]),
				};
			}
		} catch (IOException e) {
		}
		
		Arrays.sort(lrs, new Comparator<int[]>() {
			public int compare(int[] a, int[] b) {
				return a[0] - b[0];
			}
		});
		
		for (int i = 0; i < q; i++) {
			int count = 0;
			
			for (int j = 0; j < m; j++) {
				if (lrs[j][0] < pqs[i][0]) {
					continue;
				} else if(lrs[j][0] > pqs[i][1]) {
					break;
				} else if (pqs[i][1] >= lrs[j][1]) {
					count++;
				}
			}
			
			System.out.println(count);
		}
	}
}