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.
Make the vector [1 2 3 4 5 6 7 8 9 10]
35547 Solvers
202 Solvers
Permute diagonal and antidiagonal
224 Solvers
Create an n-by-n null matrix and fill with ones certain positions
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