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
Make a run-length companion vector
Given a window, how many subsets of a vector sum positive
Piecewise linear interpolation
Find the hypotenuse
Return elements unique to either input
Converting numbers back from extended form
Hackathon - String version
Exponents in Factorials
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