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Initial data commit

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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
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Task/Priority-queue/PicoLisp/priority-queue-3.l Normal file
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(de heap-first (H) (car H))
(de heap-merge (H1 H2)
(cond
((= H1 NIL) H2)
((= H2 NIL) H1)
((< (car H1) (car H2))
(cons (car H1) (cons H2 (cdr H1))))
(T
(cons (car H2) (cons H1 (cdr H2))))))
(de heap-insert (Item Heap)
(heap-merge (list Item) Heap))
(de "merge-pairs" (H)
(if (= (cdr H) NIL)
(car H) # also handles NIL (H = NIL -> NIL)
(heap-merge
(heap-merge (car H) (cadr H))
("merge-pairs" (cddr H)))))
(de heap-rest (H)
("merge-pairs" (cdr H)))