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.
Connect Four Win Checker
2 b | ~ 2 b
Energy of a photon
Specific Element Count
Coin change combinations.
Lowest sum from a group of digits
A (wrong) place for everything, and everything in its (wrong) place
Break it up! Break it up!
Make one vector from two others
Sums of Multiple Pairs of Triangular Numbers
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