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.
surface of a spherical planet
Some Assembly Required
Set some matrix elements to zero
I Plead the Fifth
Fun with a compass
Miles to go before I sleep
It's Happy! It's Fun! It's Happy Fun Hyperball!
S-T-R-E-T-C-H I-T O-U-T
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