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lex_ne(+Collection1, +Collection2)
Collection1 is lexicographically not equal to Collection2
- Collection1
- Collection of integers or (domain) variables
- Collection2
- Collection of integers or (domain) variables
Description
Constrains the two collections to be lexicographically different, i.e.
the two collections are either different lengths, or at least
one element in one collection is different from its corresponding
element in the other collection.
This constraint is known as lex_different in the global constraint
catalog, but the catalog's definition requires Collection1 and
Collection2 to be the same size. It is implemented using Gecode's
rel() constraint (variant that takes two IntVarArgs arguments),
with the IRT_NQ IntRelType.
Examples
[eclipse 52]: lex_ne([5,2,7,1], [5,3,7,1]).
...
Yes (0.00s cpu)
[eclipse 53]: lex_ne([5,2,7,1], [5,2,7]).
...
Yes (0.00s cpu)
[eclipse 54]: lex_ne([5,2,7], [5,2,7,1]).
...
Yes (0.00s cpu)
[eclipse 55]: lex_ne([5,2,7,1], [5,2,7,1]).
No (0.00s cpu)
See Also
lex_lt / 2, lex_gt / 2, lex_eq / 2, lex_ge / 2