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Outlineofthelastclass;IMPLEMENTATIONSOFQUEUES
;Contiguousimplementation;1.ThePhysicalModel(物理模型)
Thestrategy(策略)istokeepthefrontofthequeuealwaysinthefirstlocationofthearray.
;4;2.LinearImplementation(队列的顺序实现)
Toappendanentrytothequeue,wesimplyincreasetherearbyoneandputtheentryinthatposition.Toserveanentry,wetakeitfromthepositionatthefrontandthenincreasethefrontbyone.;
Problem:nottrueoverflow(假溢出)happens
fault:discardedspace
Thismethodhasamajordefect(缺点):Boththefrontandrearindicesareincreasedbutneverdecreased.Asthequeuemovesdownthearray,thestoragespaceatthebeginningofthearrayisdiscarded(丢弃)andneverusedagain.
Advantage:forapplicationswherethequeueisregularlyemptied,thenatatimewhenthequeueisempty,thefrontandrearcanbothberesettothebeginningofthearray,andthesimpleschemeofusingtwoindicesandstraight-linestorageesaveryefficientimplementation.
inefficientuseofspace
Alimitedway
;3.CircularArray(循环队列)
Inconcept,wecanetheinefficientuseofspacesimplybythinkingofthearrayasacircleratherthanastraightline.(可以克服假溢出的问题),nowweneednotworryaboutrunningoutofspaceunlessthearrayisfullyoccupied,inwhichcasewetrulyhaveoverflow.(除非数组空间真正耗尽真溢出,否则不需担心假溢出。);Job1;ImplementationofCircularArrays(循环队列的实现)
Anarrayholdalltheentriesandthefirstlocationissupposedthenextofthelast;一个被认为是首尾相连的数组
frontandrear;front和rear分别指示着队头和队尾元素的位置
Howtoappendanentrytothequeue?
Howtoserveanentryfromthequeue?
Howtoinitthefrontandrear?;;Job1;Howtoseveranentry;Attention;;;IMPLEMENTATIONSOFQUEUES
;IMPLEMENTATIONSOFQUEUES
;IMPLEMENTATIONSOFQUEUES
;CIRCULARIMPLEMENTATIONOFQUEUESINC++(循环队列实现);CIRCULARIMPLEMENTATIONOFQUEUESINC++;CIRCULARIMPLEMENTATIONOFQUEUESINC++;CIRCULARIMPLEMENTATIONOFQUEUESINC++;CIRCULARIMPLEMENTATIONOFQUEUESINC++;CIR
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