No need for finding / calculating any phi or angle here. Just simpler than it is written.
Reverse Run-Length Encoder
Angle between two vectors
Make a run-length companion vector
How many trades represent all the profit?
Given a window, how many subsets of a vector sum positive
How long do each of the stages of the rocket take to burn?
How many days does the cat take to climb out of the hole?
Solve the set of simultaneous linear equations
Pythagorean perfect squares: find the square of the hypotenuse and the length of the other side
Find the definite integral of various linear functions
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