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rank/unrank permutations in C
C programs to rank and unrank k-permutations in linear time. Usage: rank n <k> Description: n is the length of the set. k is the length of the permutation. If omitted, k is set to n. k must be <= n. rank reads k numbers from stdin, which must be 0 to k - 1, separated by \n. output is the rank of the input k-permutation of n. Usage: unrank r n <k> r is the desired rank. n is the length of the set. k is the length of the permutation. If omitted, k is set to n. k must be <= n. output is the k-permutation of n of rank r.
unranking a ranked k-permutation does not equal the original k-permutation
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