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 :-)
Find all elements less than 0 or greater than 10 and replace them with NaN
Swap the first and last columns
Implement simple rotation cypher
Integer Sequence - II : New Fibonacci
Fermat's last theorem - again
Beauty of Parentheses
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