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Puzzles and pastimes from the book `Programmation Lineaire' Description The following models implement solutions to the puzzles
published in the book `Programmation Lineaire' by
C. Gueret, C. Prins, and M. Sevaux (Eyrolles 2000, in French).
Each problem is implemented as a MIP and as a CP model.
These models show how to formulate different logical constraints using binary variables (MIP models) or logical constraint relations and global constraints (CP models).
Source Files By clicking on a file name, a preview is opened at the bottom of this page. k5nephew.mos (!****************************************************** Mosel Example Problems ====================== file k5nephew.mos ````````````````` Distributing wine barrels among nephews A farmer wishes to distribute his 45 wine barrels among his 5 nephews. 9 barrels are full, 9 filled to 3/4, 9 half-full, 9 filled to a quarter, and 9 are empty. Each nephew is to receive the same number of barrels and the same volume of wine. Furthermore, each nephew must receive at least one barrel of every type and no two of the nephews must be allocated exactly the same number of barrels of every fill type. - Enumerating multiple solutions - (c) 2008 Fair Isaac Corporation author: S. Heipcke, Mar. 2002, rev. June 2011 *******************************************************!) model "K-5 Nephew" uses "mmxprs" declarations NN = 5; NT = 5 NEPHEWS = 1..NN ! Nephews TYPES = 1..NT ! Contents types of wine barrels BARRELS = 45 COEF: array(TYPES) of integer ! Factors for "alldifferent" constraint FILL: array(TYPES) of real ! Fill level of barrels give: array(NEPHEWS,TYPES) of mpvar ! Barrels of type t for every nephew p: array(NEPHEWS) of mpvar ! 'Pattern': value of the product ! c*give(n,t) end-declarations FILL:: [1, 0.75, 0.5, 0.25, 0] COEF:: [10000, 1000, 100, 10, 1] ! Barrels per nephew forall(n in NEPHEWS) sum(t in TYPES) give(n,t) = BARRELS/NN forall(t in TYPES) sum(n in NEPHEWS) give(n,t) = BARRELS/NN ! Equilibrated contents forall(n in NEPHEWS) sum(t in TYPES) FILL(t)*give(n,t) = BARRELS/NN * (sum(t in TYPES) FILL(t))/NT ! Every nephew receives a different number of barrels of any given type ! (that is, a different pattern for every nephew) forall(n in NEPHEWS) sum(t in TYPES) COEF(t)*give(n,t) = p(n) forall(n in 2..NN) p(n) - p(n-1) >= 1 forall(n in NEPHEWS,t in TYPES) do give(n,t) is_integer 1 <= give(n,t); give(n,t) <= NN end-do ! Solve the problem: no objective minimize(XPRS_ENUM,0) ! Solution printing forall(i in 1..getparam("XPRS_enumsols")) do selectsol(i) ! Select a solution from the pool writeln("Solution ", i) forall(n in NEPHEWS) do write(n,": ") forall(t in TYPES) write( getsol(give(n,t)), " " ) writeln end-do end-do end-model | ||||||||||||||||||||||||||||||
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