For given positive integer n, take factorial of that number. How many trailing zeros does it have?
Example: factorial(11) = 39916800
Its last zero-digit count is 2.
Optional: Can you make an efficient algorithm for a very large n?
Determine Whether an array is empty
Return area of square
Create the following sequence : 0 1 1 4 9 25 64 169 ...
Sum of self power series
Make a rainbow matrix (follow-up to checkerboard matrix)
Number of paths on a 3d grid
Under the sea: Snell's law & total internal reflection
Fractal: area and perimeter of Koch snowflake
Equal temperament - musical notes and frequency
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