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 Scala (2.11.7) (judge verdict: Accepted)

object Main extends App{
    val Array(n, m, q) = scala.io.StdIn.readLine.split(" ").map(_.toInt)
    val LR = new Array[(Int, Int)](m)
    val PQ = new Array[(Int, Int)](q)

    val MM = Array.ofDim[Long](n+1, n+1)

    for(i<-0 until m){
    	val Array(t1, t2) = scala.io.StdIn.readLine.split(" ").map(_.toInt)
    	LR(i) = (t1, t2)
    }

    for(i<-0 until q){
    	val Array(t1, t2) = scala.io.StdIn.readLine.split(" ").map(_.toInt)
    	PQ(i) = (t1, t2)
    }

    LR.map{ case(l,r) => MM(l)(r) += 1 }

    //MM.foreach(a => println(a.mkString(" ")))

    for(i <- 1 to n; j <- 1 to n){
    	MM(i)(j) += MM(i-1)(j) + MM(i)(j-1) - MM(i-1)(j-1)
    }

    val ans = PQ.map{ case(p,q) => 
		MM(q)(q) - MM(p-1)(q) - MM(q)(p-1) + MM(p-1)(p-1)		
	}

	for(x <- ans){
		println(x)
	}

}