Return the number of days in a given month in 2017. If the input is not a valid month number, return -1.
Input: m = 1
Outpu: d = 31
Input: m = 2
Output: d = 28
Input: m = 13
Output: d = -1
You cannot use IF statements
Return a list sorted by number of occurrences
surface of a spherical planet
Is this matrix orthogonal?
Number of 1s in a binary string
Separate even from odd numbers in a vector - with a loop
Horizontal matrix sort
How many unique Pythagorean triples?
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