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Map coloring (Posted on 2015-06-05) Difficulty: 2 of 5
Imagine an island composed of several connected countries with no enclaves or exclaves. We are concerned with coloring a map of the island with as few colors as possible.

If two neighboring countries merge their border dissolves and they become the same color.

Begin with an island that can be two colored.

One or more pairs of countries merge and now the new map of the island can only be three colored.

Again, one or more countries merge and now the map of the island requires four colors.

Find the smallest number of starting countries for which this is possible as well how they are joined.

A diagram like this example of a 3 color map should be easy enough to read:


See The Solution Submitted by Jer    
Rating: 3.3333 (3 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
A further challenge.Jer2015-06-06 21:01:25
re: 6 countries solutionSteve Herman2015-06-06 06:23:51
Solution6 countries solutionBrian Smith2015-06-05 22:50:02
QuestionPuzzle challengedSteve Herman2015-06-05 20:23:52
re(3): Drawing Challenged (spoiler?)Steve Herman2015-06-05 14:00:13
re(2): Drawing Challenged (spoiler?)Jer2015-06-05 10:51:11
Some Thoughtsre: Drawing Challenged (spoiler?)Steve Herman2015-06-05 09:52:09
Some ThoughtsDrawing Challenged (spoiler?)Steve Herman2015-06-05 09:40:25
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