Arrange Vector in descending order
Calculate the area of a triangle between three points
Find last zero for each column
Energy of an object
Given a square and a circle, please decide whether the square covers more area.
Number of paths on a 3d grid
Under the sea: Snell's law & total internal reflection
Number of even divisors of a given number
The last non-zero digit of a factorial
Smallest n, for n! to have m trailing zero digits
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