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.
Back and Forth Rows
Which doors are open?
Implement simple rotation cypher
ASCII Birthday Cake
How many days?!?
S-T-R-E-T-C-H I-T O-U-T
Kurchan 5x5 - Optimal Score
Break it up! Break it up!
How Far Can You Throw Something?
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