static public void WritePermutationIndexLO(int[] permutation) // LO- lexicographical order { int[][] cyclePermutation = WithoutRepetition.PermutationToCycle(permutation); long index = WithoutRepetition.PermutationIndexInLexOrder(permutation); using (StreamWriter writer = new StreamWriter("log.txt", true)) { WriteDate(writer); WriteLine(writer, "Permutation index in lexicographical order: "); WriteLine(writer); Write(writer, "One-line notation: "); WriteVector(writer, permutation); WriteLine(writer); Write(writer, "Canonical cycle notation: "); WriteCycle(writer, cyclePermutation); WriteLine(writer); WriteLine(writer); WriteLine(writer, "Index: " + index); WriteLine(writer); } }