Question 4
A beaver lives in a small pond surrounded by forests and rocky regions. Each day it cuts down every forest region adjacent to the current pond and turns those regions into pond. Rock cannot be converted.
Pond symbol:
Forest symbol:
Rock symbol:
After how many days will all forests on the map have been cut? Editorial adjacency convention: regions are adjacent when they share a boundary segment; new pond regions expand further only on the next day.
Pond symbol:
Forest symbol:
Rock symbol:
After how many days will all forests on the map have been cut? Editorial adjacency convention: regions are adjacent when they share a boundary segment; new pond regions expand further only on the next day.