81 lines
2.3 KiB
Prolog
81 lines
2.3 KiB
Prolog
:- use_module(library(simplex)).
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% tuples (name, weights, value, pieces).
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knapsack :-
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L = [(map, 9, 150, 1),
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( compass, 13, 35, 1),
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( water, 153, 200, 2),
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( sandwich, 50, 60, 2),
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( glucose, 15, 60, 2),
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( tin, 68, 45, 3),
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( banana, 27, 60, 3),
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( apple, 39, 40, 3),
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( cheese, 23, 30, 1),
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( beer, 52, 10, 3),
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( 'suntan cream', 11, 70, 1),
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( camera, 32, 30, 1),
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( 'T-shirt', 24, 15, 2),
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( trousers, 48, 10, 2),
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( umbrella, 73, 40, 1),
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( 'waterproof trousers', 42, 70, 1),
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( 'waterproof overclothes', 43, 75, 1),
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( 'note-case', 22, 80, 1),
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( sunglasses, 7, 20, 1),
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( towel, 18, 12, 2),
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( socks, 4, 50, 1),
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( book, 30, 10, 2)],
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gen_state(S0),
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length(L, N),
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numlist(1, N, LN),
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time(( create_constraint_N(LN, L, S0, S1),
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maplist(create_constraint_WV, LN, L, LW, LV),
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constraint(LW =< 400, S1, S2),
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maximize(LV, S2, S3)
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)),
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compute_lenword(L, 0, Len),
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sformat(A1, '~~w~~t~~~w|', [Len]),
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sformat(A2, '~~t~~w~~~w|', [4]),
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sformat(A3, '~~t~~w~~~w|', [5]),
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print_results(S3, A1,A2,A3, L, LN, 0, 0).
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create_constraint_N([], [], S, S).
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create_constraint_N([HN|TN], [(_, _, _, Nb) | TL], S1, SF) :-
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constraint(integral(x(HN)), S1, S2),
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constraint([x(HN)] =< Nb, S2, S3),
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constraint([x(HN)] >= 0, S3, S4),
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create_constraint_N(TN, TL, S4, SF).
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create_constraint_WV(N, (_, W, V, _), W * x(N), V * x(N)).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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compute_lenword([], N, N).
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compute_lenword([(Name, _, _, _)|T], N, NF):-
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atom_length(Name, L),
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( L > N -> N1 = L; N1 = N),
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compute_lenword(T, N1, NF).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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print_results(_S, A1, A2, A3, [], [], WM, VM) :-
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sformat(W0, '~w ', [' ']),
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sformat(W1, A1, [' ']),
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sformat(W2, A2, [WM]),
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sformat(W3, A3, [VM]),
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format('~w~w~w~w~n', [W0, W1,W2,W3]).
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print_results(S, A1, A2, A3, [(Name, W, V,_)|T], [N|TN], W1, V1) :-
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variable_value(S, x(N), X),
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( X = 0 -> W1 = W2, V1 = V2
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; sformat(S0, '~w ', [X]),
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sformat(S1, A1, [Name]),
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sformat(S2, A2, [W]),
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sformat(S3, A3, [V]),
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format('~w~w~w~w~n', [S0, S1,S2,S3]),
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W2 is W1 + X * W,
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V2 is V1 + X * V),
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print_results(S, A1, A2, A3, T, TN, W2, V2).
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