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According to graph theory, in order to color any map so that 2 touching regions don't have the same color, 4 distinct colors are enough.

Can somebody color the following map?

enter image description here

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    $\begingroup$ I was just trying a different puzzle. You people are pretty quick with downvotes :D $\endgroup$
    – jack
    Commented Aug 16, 2017 at 18:33
  • $\begingroup$ Has a correct answer been given? If so, please don't forget to $\color{green}{\checkmark \small\text{Accept}}$ it :) $\endgroup$
    – Rubio
    Commented Aug 20, 2017 at 5:39

2 Answers 2

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Here is the answer:

enter image description here

This was pretty easy though.

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7 is surrounded by 3 squares that all touch, so they are each one of the four colours.

Let us mark them as

7: Red, 6: Blue: 2: Green, 1: Black

Then

1,2, and 6 all border 3, so 3 is Red. 1,3,6 all border 8, so 8 is Green. 4 is then Blue, and 5 is Red. 6,3,8 border 9, so 9 is Black.

Final Colours:

Red: 3,5,7; Blue: 4,6; Green: 2,8; Black: 1,9

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