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: Accepted)

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Main main = new Main();
        main.solve();
    }
    public void solve() {
        Scanner scan = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
        int N = scan.nextInt();
        int M = scan.nextInt();
        int Q = scan.nextInt();
        int[][] map = new int[N][N];
        for (int i = 0; i < M; i++) {
            int L = scan.nextInt() - 1;
            int R = scan.nextInt() - 1;
            map[L][R] += 1;
        }
        int[][] sum = new int[N][N+1];
        for (int i = 0; i < N; i++) {
            for (int j = 1; j <= N; j++) {
                sum[i][j] = sum[i][j-1]+map[i][j-1];
            }
        }
        for (int i = 0; i < Q; i++) {
            int p = scan.nextInt()-1;
            int q = scan.nextInt()-1;
            int ans = 0;
            for (int j = p; j <= q; j++) {
                ans += sum[j][q+1]-sum[j][p];
            }
            System.out.println(ans);
        }
    }
    private int findL(int[] x, int key) {
        int l = 0;
        int r = x.length - 1;
        while (l <= r) {
            int mid = (l + r) / 2;
            if (key <= x[mid]) {
                r = mid - 1;
            } else {
                l = mid + 1;
            }
        }
        return l;
    }

    private int findR(int[] x, int key) {
        int l = 0;
        int r = x.length - 1;
        while (l <= r) {
            int mid = (l + r) / 2;
            if (x[mid] <= key) {
                l = mid + 1;
            } else {
                r = mid - 1;
            }
        }
        return r;
    }
}