Undirected Graph

As we know, Rikka is poor at math. Yuta is worrying about this situation, so he gives Rikka some math tasks to practice. There is one of them:

There is an undirected graph with $n$ vertices and $m$ edges. Then Yuta does $q$ operations on this graph. Each operation is described by two integers $L,R\ (1 \leq L \leq R \leq n)$ and can be split into three steps:

1. Delete all the edges which have at least one vertice outside the range $[L,R]$.

2. Yuta wants you to tell him the number of connected component of the graph.

3. Restore the graph.

This task is too hard for Rikka to solve. Can you help her?

There are at most 100 testcases and there are at least 97 testcases with $n,m,q \leq 1000$.

For each testcase, the first line contains three numbers $n,m,q\ (n,q \leq 10^5, m \leq 2 \times 10^5)$.

Then $m$ lines follow. Each line contains two numbers $u_i,v_i\ (1 \leq u_i,v_i \leq 10^5)$ which describe an edge of the graph.

Then $q$ lines follows. Each line contains two numbers $L_i,R_i\ (1 \leq L \leq R \leq n)$ which describe an operation.

For each operation you need print a single line with a single number - the answer of this operation.

3 3 2
1 2
1 3
2 3
1 2
1 3

2
1

XJZX

2015 Multi-University Training Contest 4