71 lines
1.9 KiB
Perl
71 lines
1.9 KiB
Perl
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%% Exercise 2.4: Here are six Italian words:
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%%
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%% - astante
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%% - astoria
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%% - baratto
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%% - cobalto
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%% - pistola
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%% - statale
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%%
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%% They are to be arranged, crossword puzzle fashion, in the following grid:
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%%
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%% V1 V2 V3
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%% . . .
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%% H1 . 1 . 4 . 7 .
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%% . . .
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%% H2 . 2 . 5 . 8 .
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%% . . .
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%% H3 . 3 . 6 . 9 .
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%% . . .
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%%
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%% The following knowledge base represents a lexicon containing these words:
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word(astante, a,s,t,a,n,t,e).
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word(astoria, a,s,t,o,r,i,a).
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word(baratto, b,a,r,a,t,t,o).
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word(cobalto, c,o,b,a,l,t,o).
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word(pistola, p,i,s,t,o,l,a).
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word(statale, s,t,a,t,a,l,e).
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%% Write a predicate crossword/6 that tells us how to fill in the
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%% grid. The first three arguments should be the vertical words from
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%% left to right, and the last three arguments the horizontal words
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%% from top to bottom.
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crossword(V1, V2, V3, H1, H2, H3) :-
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word(V1, _, _1, _, _2, _, _3, _),
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word(V2, _, _4, _, _5, _, _6, _),
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word(V3, _, _7, _, _8, _, _9, _),
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word(H1, _, _1, _, _4, _, _7, _),
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word(H2, _, _2, _, _5, _, _8, _),
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word(H3, _, _3, _, _6, _, _9, _),
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V1 \= V2, V1 \= V3, V1 \= H1, V1 \= H2, V1 \= H3,
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V2 \= V3, V2 \= H1, V2 \= H2, V2 \= H3,
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V3 \= H1, V3 \= H2, V3 \= H3,
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H1 \= H2, H1 \= H3, H2 \= H3.
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%% NB: execute the following query to find out the correct arrangement.
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%% crossword(A, B, C, D, E, F).
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%% $ swipl -q
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%% 1 ?- [italiano].
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%% true.
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%%
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%% 2 ?- crossword(A, B, C, D, E, F).
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%% A = astante,
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%% B = cobalto,
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%% C = pistola,
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%% D = astoria,
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%% E = baratto,
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%% F = statale ;
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%% A = astoria,
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%% B = baratto,
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%% C = statale,
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%% D = astante,
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%% E = cobalto,
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%% F = pistola ;
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%% false.
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%% Note that there are two solutions; these are mirrors of each other
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%% with the vertical words substituted for the horizontal words.
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