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
Most nonzero elements in row
radius of a spherical planet
Sum of the Matrix Elements
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Triangle of numbers
Add a vector to a matrix
Remove the first, third and fifth rows of a matrix
Find the starting index of a consecutive condition
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