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Matcom Online Grader
Faculty of Mathematics and Computer Science of University of Havana
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You are given a non-connected graph G consisting of N nodes and M edges. A graph is said to be non-connected if it is possible to find at least one pair of nodes such that no path in the graph has those nodes as endpoints.
Your task is to answer Q queries. In each query you are given two integers a and b , and you need to compute the length (in edges) of the shortest path between nodes a and b in the complement of G . The complement of a graph G is another graph G′ that doesn't contain any of the edges present in G and contains all the edges not present in G .
Input
The first line contains two integers 1≤N,M≤105 . The number of nodes and edges of the graph.
The next M lines contain two integers 1≤a,b≤N,a≠b . Each line represents a bidirectional edge in the graph G .
The next line contains an integer 1≤Q≤105 , representing the number of queries to answer.
The next Q lines contain two integers 1≤a,b≤N,a≠b . Each line represents a query in the format described above.
Output
For each of the Q queries, print an integer value representing the length (in edges) of the shortest path between the nodes a and b in the complement graph of G .
Sample test(s)
Input
5 3
1 2
2 3
4 5
4
1 2
2 3
3 4
4 5
Output
2
2
1
2