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]
Scoring for oriented dominoes
Return the first and last character of a string
find the maximum element of the matrix
Sum of odd numbers in a matrix
length of a vector
User defined nextpow function
Find my birthday
Back to basics - array operations
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