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?
Rotate a Matrix by 90 degrees
Find Factrorial without using built-in function
Generate this matrix
Replace Negative(-) by 0 and positive by 1
Number of paths on a n-dimensional grid
Smallest n, for n! to have m trailing zero digits
Fractal: area and perimeter of Koch snowflake
Make a rainbow matrix (follow-up to checkerboard matrix)
Under the sea: Snell's law & total internal reflection
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