William Gates and Christos Papadimitrou solved this problem, before the former left to co-found Microsoft. Very interesting problem indeed.
Sum of diagonal of a square matrix
Construct an index vector from two input vectors in vectorized fashion
Create a Multiplication table matrix...
Length of the hypotenuse
Another colon problem
Arithmetic/geometric sequence, 50/50
Which permutation is it?
Don't Try, give up and return NaN.
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