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.
It dseon't mettar waht oedrr the lrettes in a wrod are.
Swap the input arguments
vectorization in N
Sums of Multiple Pairs of Triangular Numbers
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
I've got the power! (Inspired by Project Euler problem 29)
I'm going to enjoy watching you calculate, Mr Anderson
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