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
Energy of a photon
Set some matrix elements to zero
Permute diagonal and antidiagonal
Fahrenheit to Celsius converter
Replace every 3rd element in a vector with 4
Find the starting index of a consecutive condition
Horizontal matrix sort
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