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yap-6.3/packages/gecode/clp_examples/send_most_money.yap

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%% -*- prolog -*-
%%=============================================================================
%% Copyright (C) 2011, 2013 by Denys Duchier, Vitor Santos Costa
%%
%% This program is free software: you can redistribute it and/or modify it
%% under the terms of the GNU Lesser General Public License as published by the
%% Free Software Foundation, either version 3 of the License, or (at your
%% option) any later version.
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%%
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%% This program is distributed in the hope that it will be useful, but WITHOUT
%% ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
%% FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
%% more details.
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%%
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%% You should have received a copy of the GNU Lesser General Public License
%% along with this program. If not, see <http://www.gnu.org/licenses/>.
%%=============================================================================
:- use_module(library(gecode/clpfd)).
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main :-
statistics( runtime, _ ),
once( send_most_money(Letters, Money) ),
statistics( runtime, [DT|_] ),
% findall(Queens, queens(I, Queens), Solutions ),
% length( Solutions, N),
format('took ~w msec to find first solution, ~w.~n', [DT, Letters:Money]),
fail.
main.
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% S E N D
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% + M O S T
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% ---------
% M O N E Y
send_most_money(Letters, Money) :-
[S,E,N,D,M,O,T,Y] = Letters,
Letters ins 0..9,
Money in 0..99999,
M #\= 0,
S #\= 0,
all_distinct(Letters),
1000*S + 100*E + 10*N + D +
1000*M + 100*O + 10*S + T #= Money,
10000*M + 1000*O + 100*N + 10*E + Y #= Money,
maximize(Money),
labeling([], Letters).