Created
September 17, 2023 05:18
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N-Puzzle solver
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ops(+). | |
ops(-). | |
ops(*). | |
ops(/). | |
calc([], [Result], Result). | |
calc([+ | Rest], [B, A | Stack], Result) :- calc(Rest, [A + B | Stack], Result). | |
calc([- | Rest], [B, A | Stack], Result) :- calc(Rest, [A - B | Stack], Result). | |
calc([- | Rest], [B, A | Stack], Result) :- calc(Rest, [B - A | Stack], Result). | |
calc([* | Rest], [B, A | Stack], Result) :- calc(Rest, [A * B | Stack], Result). | |
calc([/ | Rest], [B, A | Stack], Result) :- B > 0, calc(Rest, [A / B | Stack], Result). | |
calc([/ | Rest], [B, A | Stack], Result) :- A > 0, calc(Rest, [B / A | Stack], Result). | |
calc([N | Rest], Stack, Result) :- number(N), calc(Rest, [N | Stack], Result). | |
expr([N], 0, 0, Expr, [N | Expr]). | |
expr(Stack, Nums, Ops, Expr, Result) :- | |
Ops > 0, | |
ops(Op), | |
NextOps is Ops - 1, | |
expr(Stack, Nums, NextOps, [Op | Expr], Result). | |
expr([N , M | Stack], Nums, Ops, Expr, Result) :- | |
Nums > Ops, | |
NextNums is Nums - 1, | |
expr([M | Stack], NextNums, Ops, [N | Expr], Result). | |
solve_n_puzzle(N, Nums, Result) :- | |
length(Nums, Len), | |
Len > 0, | |
Size is Len - 1, | |
expr(Nums, Size, Size, [], Expr), | |
calc(Expr, [], Result), | |
Result =:= N. |
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