I took complements of the test case polar angles in order to agree with customary definitions of polar angle.
I agree. Polar angles are, by convention, measured from the pole, but in this problem you have to consider them to be measure from the equator if you wish to agree with the test cases.
So many choices
Matrix indexing with two vectors of indices
Return the first and last character of a string
Will there be a new leader?
Is this is a Tic Tac Toe X Win?
First N Perfect Squares
Specific Element Count
Clock Hand Angle 1
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