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.
Multiples of a Number in a Given Range
sum of first 'n' terms
Simple equation: Annual salary
Power The Product
Reverse CHECKBOX MATRIX with 69
Generate binary combinations for a given number of bit(s)
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