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Ingy döt Net 2013-06-05 21:47:54 +00:00
parent 1f1ad49427
commit 6f050a029e
2496 changed files with 37609 additions and 3031 deletions
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30
Task/Fibonacci-sequence/Prolog/fibonacci-sequence-2.pro
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@ -1,13 +1,19 @@
:- use_module(lambda).
fib(N, FN) :-
cont_fib(N, _, FN, \_^Y^_^U^(U = Y)).
?- time(fib(0,F)).
% 2 inferences, 0.000 CPU in 0.000 seconds (88% CPU, 161943 Lips)
F = 0.
cont_fib(N, FN1, FN, Pred) :-
( N < 2 ->
call(Pred, 0, 1, FN1, FN)
;
N1 is N - 1,
P = \X^Y^Y^U^(U is X + Y),
cont_fib(N1, FNA, FNB, P),
call(Pred, FNA, FNB, FN1, FN)
).
?- time(fib(10,F)).
% 265 inferences, 0.000 CPU in 0.000 seconds (98% CPU, 1458135 Lips)
F = 55.
?- time(fib(20,F)).
% 32,836 inferences, 0.016 CPU in 0.016 seconds (99% CPU, 2086352 Lips)
F = 6765.
?- time(fib(30,F)).
% 4,038,805 inferences, 1.122 CPU in 1.139 seconds (98% CPU, 3599899 Lips)
F = 832040.
?- time(fib(40,F)).
% 496,740,421 inferences, 138.705 CPU in 140.206 seconds (99% CPU, 3581264 Lips)
F = 102334155.