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
First N Perfect Squares
Add a row of zeros on top of a matrix
Rounding off numbers to n decimals
Find the dimensions of a matrix
Cumulative product of a vector
Add a vector to a matrix
Triangle of numbers
Vertical matrix sort
Sum of adjacent elements in a vector
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