Coloring [0 1 0 1 1 0 2] seems to work for test case 2, giving it a chromatic number of 3 rather than 4.
yes.. corrected. Thanks for pointing it out :-)
Return the largest number that is adjacent to a zero
Community Problem 500!
Swap two numbers
birthday on same day of week
Neither minima nor maxima
Collaborative Fun : Nomination
Determine connected components of a graph
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