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.
Remove all the consonants
Back to basics 9 - Indexed References
Spot the outlier
intersection of matrices
Crunch that matrix!
How Far Can You Throw Something?
Why the heck are they blinking!?!?
Longest run of consecutive numbers
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