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.
Distance walked 2D
Angle between Two Vectors
Count consecutive 0's in between values of 1
Sums of Multiple Pairs of Triangular Numbers
Hackathon - String version
Numbered lottery balls into cells
Miles to go before I sleep
It's going down. We're finding simbers!
Iccanobif numbers 1
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