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.
Renaming a field in a structure array
Find best placement for ordered dominoes (harder)
Oh Zero Zero Zero!!!
Kurchan 5x5 - Optimal Score
Numbers in extended form
Sums of Distinct Powers
Longest run of consecutive numbers
High Precision Square Root (Inspired by Project Euler 80)
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