Test problem 21 is faulty.
It has been updated.
Test suite has crashed again plz fix
@ Nikolaos: are you sure it's the test suite and not a server error? If you get the following message, it is due to a temporary server problem, not a specific problem: "While evaluating the solution, the server encountered an error caused by temporary unavailability of MATLAB Service. Wait a few minutes for the MATLAB Service to return, and then rescore." If you are getting this error, simply try the problem again later or on a different day.
Back and Forth Rows
Find state names that end with the letter A
Calculate the Levenshtein distance between two strings
Calculate the area of a triangle between three points
Recaman Sequence - I
Rule of mixtures (composites) - reverse engineering
The 5th Root
Scrabble Scores - 13
Lights Out 8 - 5x5, light-only solution? I
Calculator spelling - Letters to Numbers
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