Permutations/Rank of a permutation: Difference between revisions
Permutations/Rank of a permutation (view source)
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The J primitive <code>A.</code> provides an effective solution to this task. Generating 4 random permutations of 144 items takes about 6 milliseconds so solving the Stack Overflow question
<lang j> A. 2 0 1 NB. return rank of permutation
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