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104 lines
2.6 KiB
Plaintext
104 lines
2.6 KiB
Plaintext
!:
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:: /=main=/bin/app/hoon
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::
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=> %= .
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+
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=> +
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=> ^/===/bin/pque
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|%
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:: efficient priority queue
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:: possibly empty
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++ pque |* [a=_,* b=_,*]
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(unit (rque a b))
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:: internal - nonempty pque
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++ rque |* [a=_,* b=_,*]
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$: k=a
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n=b
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q=(bque a (rque a b))
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==
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:: maximally optimal priority queue
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:: O(1) insert, meld, peek
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:: O(log n) pop
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::
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:: lte -> min priority queue
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:: gte -> max priority queue
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::
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:: bootstrapped off of ++pr
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::
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:: to create, use something like
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:: ~zod/try=> ((qu ,@ ,@) lte)
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::
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:: example operations
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::
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:: =+ pri=((qu ,@ ,@) lte)
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:: =+ q=~
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:: =. q (insert.pri q 3 2)
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:: =^ r q (pop.pri q)
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++ qu !:
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|* [key=$+(* *) val=$+(* *)]
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|= cmp=$+([key key] ?)
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=+ bt=((pr key (rque key val)) cmp)
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|%
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++ insert
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|= [q=(pque key val) k=key n=val]
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^- (pque key val)
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(meld [~ [k=k n=n q=~]] q)
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++ meld
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|= [q=(pque key val) p=(pque key val)]
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^- (pque key val)
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?~ p q
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?~ q p
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?: (cmp k.u.p k.u.q)
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[~ [k=k.u.p n=n.u.p q=(insert.bt q.u.p [k=k.u.q n=[k.u.q n=n.u.q q=q.u.q]])]]
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[~ [k=k.u.q n=n.u.q q=(insert.bt q.u.q [k=k.u.p n=[k=k.u.p n=n.u.p q=q.u.p]])]]
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:: errors on empty pque, sigcheck first
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++ peek
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|= q=(pque key val)
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^- [k=key n=val]
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?~ q ~|(%empty-pque-peek !!)
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[k=k.u.q n=n.u.q]
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:: errors on empty pque, sigcheck first
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++ pop
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|= q=(pque key val)
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^- [r=[k=key n=val] q=(pque key val)]
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?~ q ~|(%empty-pque-pop !!)
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?~ q.u.q
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[r=(peek q) q=~] :: queue is now empty
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=+ s=(pop.bt q.u.q) :: [r=[k=key n=rque] q=bque]
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~! s
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[r=(peek q) q=[~ [k=k.r.s n=n.n.r.s q=(meld.bt q.n.r.s q.s)]]]
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--
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--
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==
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|= *
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|= ~
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^- bowl
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:_ ~ :_ ~
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:- %$
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!>
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=+ pri=((qu ,@ ,@) lte)
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=+ pq=(insert.pri ~ 6 302)
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=. pq (insert.pri pq 5 3.897)
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=. pq (insert.pri pq 2 1)
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=+ pq2=(insert.pri ~ 508 542)
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=. pq2 (insert.pri pq2 42 89)
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=. pq2 (insert.pri pq2 325 325)
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=. pq2 (insert.pri pq2 41 37)
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=. pq (meld.pri pq pq2)
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~& pq
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=^ r pq (pop.pri pq)
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~& r
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=^ r pq (pop.pri pq)
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~& r
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=^ r pq (pop.pri pq)
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~& r
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=^ r pq (pop.pri pq)
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~& r
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=^ r pq (pop.pri pq)
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~& r
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=^ r pq (pop.pri pq)
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~& r
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=^ r pq (pop.pri pq)
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~& r
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pq
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