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 :-)
pressure to dB?
Matrix with different incremental runs
Numbers with prime factors 2, 3 and 5.
Integer Sequence - II : New Fibonacci
Determine connected components of a graph
longest common substring : Skipped character version
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