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 :-)
Back to basics 8 - Matrix Diagonals
Airline Ticket Mod7 Checksum
compress sequence into intervals
Text Processing - New
Cat, Meowcat and Concatenation
Determine connected components of a graph
longest common substring : Skipped character version
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