By Alfred V. Aho
The authors' remedy of information buildings in info buildings and Algorithms is unified by means of a casual proposal of "abstract info types," permitting readers to check various implementations of an identical idea. set of rules layout ideas also are under pressure and easy set of rules research is roofed. many of the courses are written in Pascal.
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20. A sequence of queue operations. Let us now write the five queue commands using this representation for a queue. maxlength] of elementtype; front, rear: integer end; The commands appear in Fig. 22. The function addone(i) adds one to position i in the circular sense. Fig. 21. A circular implementation of queues. 5 Mappings A mapping or associative store is a function from elements of one type, called the domain type to elements of another (possibly the same) type, called the range type. We express the fact that the mapping M associates element r of range type rangetype with element d of domain type domaintype by M(d) = r.
MAKENULL(Q) makes queue Q an empty list. 2. FRONT(Q) is a function that returns the first element on queue Q. FRONT(Q) can be written in terms of list operations as RETRIEVE(FIRST(Q), Q). 3. ENQUEUE(x, Q) inserts element x at the end of queue Q. In terms of list operations, ENQUEUE(x, Q) is INSERT(x, END(Q), Q). 4. DEQUEUE(Q) deletes the first element of Q; that is, DEQUEUE(Q) is DELETE(FIRST(Q), Q). 5. EMPTY(Q) returns true if and only if Q is an empty queue. Basic Abstract DataTypes 41 42 Basic Abstract DataTypes A Pointer Implementation of Queues As for stacks, any list implementation is legal for queues.
In the case of the function knapsack, we can do something simpler. First, observe that whenever we make a call (push a record onto the stack), candidate increases by 1. Thus, we can keep candidate as a global variable, incrementing it by one every time we push the stack and decreasing it by one when we pop. A second simplification we can make is to keep a modified "return address" on the stack. Strictly speaking, the return address for this function is either a place in some other procedure that calls knapsack, or the call at line (5), or the call at line (8).