It's very sad that there is no matlab function "npermsk".
Not work for R is long, and k is small.
For example, R = 1:100, k = 2.
@li haitao, the max digital is 9. If length of R great than 10, it is another problem. I think you can submit a problem like this but larger R.
@ Binbin Qi, You're right.
Back to basics 23 - Triangular matrix
Getting the indices from a vector
Create a vector whose elements depend on the previous element
Piecewise linear interpolation
Crunch that matrix!
Matrix of Multiplication Facts
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Sums of Distinct Powers
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