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?
Times 2 - START HERE
Swap the first and last columns
Determine if input is odd
Angle between two vectors
Sum of diagonals elements of a matrix
Equal temperament - musical notes and frequency
Number of paths on a n-dimensional grid
Smallest n, for n! to have m trailing zero digits
Number of even divisors of a given number
Number of paths on a 3d grid
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