'Empty stack' diaporamas de présentation

CFL Hierarchy CFL Decision Problems

MA/CSSE 474 Theory of Computation. CFL Hierarchy CFL Decision Problems. Your Questions?. I have included some slides online that we will not have time to do in class, but may be helpful to you anyway. Previous class days' material Reading Assignments. HW 12 or 13 problems Anything else.

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Pushdown Automata PDAs

Pushdown Automata PDAs. Pushdown Automaton -- PDA. Input String. Stack. States. Initial Stack Symbol. Stack. Stack. stack head. top. bottom. special symbol. Appears at time 0. The States. Pop symbol. Input symbol. Push symbol. input. stack. top. Replace. input. stack.

807 views • 77 slides

Lecture#27-31

Lecture#27-31. Unit-IV. Context Free Languages. A context-free grammar is a simple recursive way of specifying grammar rules by which strings of a language can be generated. All regular languages, and some non-regular languages, can be generated by context-free grammars.

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Chapter 3

Chapter 3. Stacks. Chapter Objectives. To learn about the stack data type and how to use its four methods: push pop peek empty To understand how Java implements a stack To learn how to implement a stack using an underlying array or linked list

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Pumping Lemma

Pumping Lemma. Problem: Let B be the language of all palindromes over {0,1} containing an equal number of 0s and 1s. Show that B is not CFL Solution: We assume that B is a CFL and obtain a contradiction.

1.23k views • 64 slides

STACKS AND QUEUES

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Our First Data Structure

Our First Data Structure. The story so far We understand the notion of an abstract data type. Saw some fundamental operations as well as advanced operations on arrays. This week we will use the array ADT but in a slightly different manner(s). and advanced applications of the data structure.

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Stacks

Stacks. Chapter 5. Chapter Objectives. To learn about the stack data type and how to use its four methods: push , pop , peek , and empty To understand how Java implements a stack To learn how to implement a stack using an underlying array or a linked list

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Stacks

Stacks. Stack. A stack is a data structure that works on the principle of Last In First Out (LIFO) . So last item put on the stack is the first item that can be taken off , like a physical stack of books/plates.

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CSCE 3110 Data Structures & Algorithm Analysis

CSCE 3110 Data Structures & Algorithm Analysis. Rada Mihalcea http://www.cs.unt.edu/~rada/CSCE3110 Stacks Reading: Chap.3 Weiss. Stacks. Stack: what is it? ADT Applications Implementation(s). What is a stack?. Stores a set of elements in a particular order

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Stacks

Stacks. An abstract data type (ADT) is an abstraction of a data structure An ADT specifies: Data stored Operations on the data Error conditions associated with operations. Example: ADT modeling a simple stock trading system The data stored are buy/sell orders The operations supported are

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So what's next?

So what's next?. Introduction to data structures. Two Perspectives: Abstract description (capabilities) Implementation(s) For structures: Stack Queue Deque (maybe). Clicker quiz 12/3/13. CSE 1102 Fall 2013. The country with the red star on it is: Canada Sweden Latvia

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Pushdown Automata (PDA) A PDA P is a 7-tuple (Q, ? , ? , ? , q 0 , Z 0 , F)

Pushdown Automata (PDA) A PDA P is a 7-tuple (Q, ? , ? , ? , q 0 , Z 0 , F)

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PDAs => CFGs

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Stacks

Stacks. An abstract data type (ADT) is an abstraction of a data structure An ADT specifies: Data stored Operations on the data Error conditions associated with operations. Abstract Data Types (ADTs). The Stack ADT stores arbitrary objects

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A Simple Stack Class Templates

A Simple Stack Class Templates. Eric Roberts CS 106B April 27, 2009. stack.size(). stack.push(ch). Returns the number of characters pushed onto the stack. Pushes a new character onto the stack. stack.isEmpty(). stack.pop(). Returns true if the stack is empty.

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CSE 246 Data Structures and Algorithms

CSE 246 Data Structures and Algorithms. Spring2011 Lecture#12. Evaluating Postfix. Each operator in a postfix expression refers to the previous two operands. Each time we read an operand, we push it on a stack.

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Data Structures

Data Structures. Lecture 9: Stacks Azhar Maqsood NUST Institute of Information Technology (NIIT). The Stack: Definition. A stack is an ordered collection of items into which new items may be inserted and from which items may be deleted at one end called the TOP of the stack.

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PDA

PDA. Languages accepted by nondeterministic pushdown automata. Languages accepted by deterministic pushdown automata. Chapter 14: Pushdown Automata. Languages accepted by finite automata nondeterministic finite automata transition graphs. Acceptance Criteria for PDA.

301 views • 5 slides

The main primitives of a stack are known as: Push adds a new node Pop removes a node Additional primitives can be defi

The main primitives of a stack are known as: Push adds a new node Pop removes a node Additional primitives can be defined: IsEmpty reports whether the stack is empty IsFull reports whether the stack is full Initialise creates/initialises the stack

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