Discussion
What is map colouring as a constraint problem?
Answer: A
The standard formulation makes each region a variable whose domain is the available colours, with a binary inequality constraint between every pair of adjacent regions. It is the textbook example because the constraint graph is the map's adjacency graph and can be drawn. The alternatives invert the roles or collapse the structure. Choosing what to make a variable is the first modelling decision and it determines everything that follows.
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