Given the diameter d of the inner circle of the annulus. Given length z of a chord of the outer circle of the annulus. This chord is tangent to the inner circle of the annulus. Find the area y of the annulus.
Number of 1s in the Binary Representation of a Number
How to subtract?
Flip the vector from right to left
Set x value to each even index of vector y.
Vectorizing, too easy or too hard?
surface of a spherical planet
Check if sorted
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