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
Add two numbers
Back to basics 19 - character types
Given a 4x4 matrix, swap the two middle columns
Basic arrays operations.
Find the largest number
Triangle of numbers
Sum of Two Numbers
Find the starting index of a consecutive condition
Find the average of a random sequance
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