use recursion to generate random permutations

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越琪 吴
越琪 吴 2020-10-13
评论： 越琪 吴 2020-10-15
a) Write a recursive algorithm that takes as input a set of elements and an integer l, and returns all their permutations of length l.
b) Adjust the previous algorithm to return a random subset of all the permutations containing n elements.
Hint: generating all the permutations and selecting n of them afterwards in not a good idea.
a) and b) are two codes.I really don't know how to write the code. Any help will be appreciated! Thanks a lot!

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Ameer Hamza
Ameer Hamza 2020-10-13

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