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In this problem, we have a scenario involving a number of little pigs and wolves placed on a graph. Each vertex of the graph can host zero or more pigs or wolves. Wolves can potentially capture pigs by moving through the graph. The goal is to determine which pigs remain safe and which ones are caught by wolves based on their positions and the structure of the graph. The problem typically involves simulating movement or calculating shortest distances from wolves to pigs to ascertain the outcome.
The first line contains two integers n and m, the number of vertices and edges in the graph. Then m lines follow, each containing two integers u and v representing an undirected edge between vertices u and v. Next, a line contains the positions of all little pigs, and another line contains the positions of all wolves.
Output which pigs can escape and which get caught, or output the count of safe pigs depending on the problem statement.
Typical constraints for graphs on Codeforces with up to 10^5 vertices and edges; specifics depend on the exact problem statement.
Example 1
Input
4 4 1 2 2 3 3 4 ? (positions of pigs) ? (positions of wolves)
Output
? (result according to problem)
Explanation
An example illustrating how distances from wolves affect the pigs' safety.