The.Algorithm.Design.Manual.Springer-Verlag.1998
The.Algorithm.Design.Manual.Springer-Verlag.1998 The.Algorithm.Design.Manual.Springer-Verlag.1998
Lecture 7 - elementary data structures The reason - any binary tree with n leaves has n-1 internal nodes, each of which corresponds to a call to partition in the quicksort recursion tree. Listen To Part 7-4 Elementary Data Structures ``Mankind's progress is measured by the number of things we can do without thinking.'' Elementary data structures such as stacks, queues, lists, and heaps will be the ``of-the-shelf'' components we build our algorithm from. There are two aspects to any data structure: ● The abstract operations which it supports. ● The implementation of these operations. The fact that we can describe the behavior of our data structures in terms of abstract operations explains why we can use them without thinking, while the fact that we have different implementation of the same abstract operations enables us to optimize performance. Listen To Part 7-5 Stacks and Queues Sometimes, the order in which we retrieve data is independent of its content, being only a function of when it arrived. A stack supports last-in, first-out operations: push and pop. A queue supports first-in, first-out operations: enqueue and dequeue. A deque is a double ended queue and supports all four operations: push, pop, enqueue, dequeue. Lines in banks are based on queues, while food in my refrigerator is treated as a stack. Both can be used to traverse a tree, but the order is completely different. file:///E|/LEC/LECTUR17/NODE7.HTM (2 of 13) [19/1/2003 1:34:41]
Lecture 7 - elementary data structures Which order is better for WWW crawler robots? Listen To Part 7-6 Stack Implementation Although this implementation uses an array, a linked list would eliminate the need to declare the array size in advance. STACK-EMPTY(S) PUSH(S, x) POP(S) if top[S] = 0 file:///E|/LEC/LECTUR17/NODE7.HTM (3 of 13) [19/1/2003 1:34:41] then return TRUE else return FALSE
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Lecture 7 - elementary data structures<br />
Which order is better for WWW crawler robots?<br />
Listen To Part 7-6<br />
Stack Implementation<br />
Although this implementation uses an array, a linked list would eliminate the need to declare the array size in<br />
advance.<br />
STACK-EMPTY(S)<br />
PUSH(S, x)<br />
POP(S)<br />
if top[S] = 0<br />
file:///E|/LEC/LECTUR17/NODE7.HTM (3 of 13) [19/1/2003 1:34:41]<br />
then return TRUE<br />
else return FALSE
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