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?
Select every other element of a vector
Construct a string from letters and counts
Permute diagonal and antidiagonal
Sum the 'edge' values of a matrix
Number of paths on a n-dimensional grid
Number of paths on a 3d grid
Fractal: area and perimeter of Koch snowflake
Equal temperament - musical notes and frequency
Smallest n, for n! to have m trailing zero digits
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