PFDS 11.2.2
Transcript of PFDS 11.2.2
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PFDS 11.2Catenable Double-Ended
Queues~ using implicit recursive slowdown ~
@rf0444
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Simple Implementationdata Cat a = Shallow (Deq a) | Deep (Deq a) (Cat (Deq a)) (Deq a)
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Simple Implementation
++
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Simple Implementation
snoc
cons
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Simple Implementation
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Simple Implementation
++( )
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Simple Implementation
++( )
再帰 O(min(log n1, log n2))
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using compound elementsdata Cat a = Shallow (Deq a) | Deep (Deq a) (Cat (Ele a)) (Deq a) (Cat (Ele a)) (Deq a)
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using compound elementsdata Ele a = Simple (Deq a) | Compound (Deq a) (Cat (Ele a)) (Deq a)
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using compound elements
++
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using compound elements
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using compound elements
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using compound elements
snoc cons
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using compound elements
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using compound elements
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using compound elementstail
1. f が 4 要素以上
2.a の先頭が Simple
3.a の先頭が Compound
4.a が空、b の先頭が Simple
5.a が空、b の先頭が Compound
6.a も b も空
f a m b r
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using compound elementstail (1)
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using compound elementstail (1)
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using compound elementstail (2)
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using compound elementstail (2)
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using compound elementstail (2)
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using compound elementstail (3)
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using compound elementstail (3)
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using compound elementstail (3)
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using compound elementstail (3)
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using compound elementstail (3)
++
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using compound elementstail (3)
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using compound elementstail (3)
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using compound elementstail (4)
空
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using compound elementstail (4)
空
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using compound elementstail (4)
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using compound elementstail (4)
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using compound elementstail (4)
空
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using compound elementstail (5)
空
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using compound elementstail (5)
空
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using compound elementstail (5)
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using compound elementstail (5)
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using compound elementstail (5)
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using compound elementstail (5)
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using compound elementstail (6)
空 空
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using compound elementstail (6)
空 空
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using compound elementstail (6)
*どちらかのサイズが 3 以下なら、くっつけて Shallow
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using compound elementstail (6)
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using compound elementstail (6)
空 空