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.
Get the length of a given vector
Largest Twin Primes
Binary code (array)
There are 10 types of people in the world
Should Mr McNugget even get out of bed today?
Diophantine Equations (Inspired by Project Euler, problem 66)
Go to the head of the class!
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