
lex_lt(+Collection1, +Collection2)

   Collection1 is lexicographically less than  Collection2

Arguments
   Collection1         Collection of integers or (domain) variables
   Collection2         Collection of integers or (domain) variables

Type
   library(gfd)

Description
    	Imposes a lexicographic ordering between the two lists. 
	I.e.  either is the first element of Collection1 strictly smaller
	than the first element of Collection2, or the first elements are
	equal and the lexicographic order holds between the two list
	tails. A non-existing element (i.e. when the end of list is 
        reached)is strictly smaller than any existing element.

        This constraint is known as lex_less 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_LE IntRelType.




Examples
   
[eclipse 36]: lex_lt([5,2,3,9], [5,2,6,2]).

 ...
Yes (0.00s cpu)
[eclipse 37]: lex_lt([5,2,3,9], [5,2,6]).

 ...
Yes (0.00s cpu)
[eclipse 38]: lex_lt([5,2,3], [5,2,3,9]).

 ...
Yes (0.00s cpu)
[eclipse 39]: lex_lt([5,2,3,4], [5,2,3,4]).

No (0.00s cpu)



See Also
   lex_le / 2, lex_gt / 2, lex_ge / 2, lex_eq / 2, lex_ne / 2, fd_global : lex_lt / 2, ic_global : lex_lt / 2, fd_global_gac : lex_lt / 2, ic_global_gac : lex_lt / 2
