despites its pass,my sol still wrong when it be the case:"n=7",because the central element always zero no matter how we change input "n",
my solution is actually wrong.but TestSuite didn't add a "n=7" case,so...
Smallest size solution here without regexp cheat nor look up table.
Sorted highest to lowest?
Getting the absolute index from a matrix
Make a run-length companion vector
Calculate the derivative of a polynomial
Diagonal & Anti-Diagonal Matrix: Easy
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