Return the number of edges on an n-dimensional hypercube (with an integer n ≥ 0).
Neither string operations nor interpolations are allowed!
Thanks for the nice problem! It is refreshing!
Add two numbers
Triangle Numbers Below N
Stuff the Board
Rotate input square matrix 90 degrees CCW without rot90
Dots in a Diamond
Dots in a Sphere
Shifted Hexagonal Tiling Dots in a Circle
Volume of a Simplex
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