Given a input vector x, return y as index-powered vector as shown below.
x = [2 3 6 9]
then y should be
[2^1 3^2 6^3 9^4] = [2 9 216 6561]
Which values occur exactly three times?
Reverse Run-Length Encoder
subtract central cross
Count decimal digits of a number
Matrix multiplication across rows
Back to basics - array operations
Matrix to column conversion
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