I did exactly the same thing.
I also discovered shortly thereafter that I could force an n-coloring if I allowed discontinuous regions, which might seem trivial… except that real nations on real maps are sometimes discontinuous (Alaska, anyone?).
I did exactly the same thing.
I also discovered shortly thereafter that I could force an n-coloring if I allowed discontinuous regions, which might seem trivial… except that real nations on real maps are sometimes discontinuous (Alaska, anyone?).