Input
- V —— Set of all choices, a vector of N, 1 < N < 100
- K —— Number of selected choices, a scalar, 0 <= K <= N
Output
- C —— All combinations of V, equivalent to nchoosek(V, K)
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Time consumed
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Sorry, but it's not clear to me what the objective is. At test #3, nchoosek should accept a v that is a cell array of 30 column vectors? (What's the purpose: to present combinations per vector, or to present all cell arrays that choose a certain number of vectors?) And at test #4, nchoosek(v,1) should equal v', even when v contains duplicate entries and isn't sorted?
nchoosekFast(V,K) should have the same behavior as nchoosek(V,K) for a vector V.
you can valid:
celldisp(nchoosek({[1 2],[5 6 7],3}, 2)),
nchoosek([3 1 2 2], 1).
Always return "While evaluating the solution, the server encountered an error caused by temporary unavailability of MATLAB Service. Wait a few minutes for the MATLAB Service to return, and then rescore."
Maybe you should forbid the use of nchoosek? Or is the MATLAB nchoosek faster currently? It passes the last test case without changes. Moreover, nchoosek runs within 1.30 s currently for the test case at an i5-3230M CPU, 2.60GHz. That's already pretty fast.