Swap the input arguments
Back to basics 4 - Search Path
Snakes on a plane
Multiply a column by a row
angle in regular polygon
Fractal: area and perimeter of Koch snowflake
Number of paths on a 3d grid
Under the sea: Snell's law & total internal reflection
The number of trailing zero digit of a factorial
Smallest n, for n! to have m trailing zero digits
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