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A-M baby

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Ingy döt Net 2013-04-10 21:29:02 -07:00
parent 764da6cbbb
commit db842d013d
19005 changed files with 197040 additions and 7 deletions
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Task/Find-the-missing-permutation/GAP/find-the-missing-permutation.gap Normal file
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# our deficient list
L :=
[ "ABCD", "CABD", "ACDB", "DACB", "BCDA",
"ACBD", "ADCB", "CDAB", "DABC", "BCAD",
"CADB", "CDBA", "CBAD", "ABDC", "ADBC",
"BDCA", "DCBA", "BACD", "BADC", "BDAC",
"CBDA", "DBCA", "DCAB" ];
# convert L to permutations on 1..4
u := List(L, s -> List([1..4], i -> Position("ABCD", s[i])));
# set difference (with all permutations)
v := Difference(PermutationsList([1..4]), u);
# convert back to letters
s := "ABCD";
List(v, p -> List(p, i -> s[i]));