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.
Find relatively common elements in matrix rows
Replace NaNs with the number that appears to its left in the row.
Back to basics 15 - classes
Sum the elements in either diagonal of a square matrix
Volume of a sphere given its surface area
Make combination of two given matrices.
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