Stacks are linear data structures that follow the LIFO (last in, first out) principle. Elements can only be inserted or removed from one end, called the top. Common stack operations include push to add an element and pop to remove an element. Stacks have many applications, such as converting infix notation to postfix notation and evaluating postfix expressions.
Stacks and Queues: Introduction to stacks
applications of stacks
implementation and comparison of stack implementations.
Introduction to queues
applications of queues and implementations
Priority Queues and applications
a presentation covering all the topics on Stacks and Queues in Data Structures using C++. Includes self explanatory diagrams, algorithms and program pieces.
Stacks and Queues: Introduction to stacks
applications of stacks
implementation and comparison of stack implementations.
Introduction to queues
applications of queues and implementations
Priority Queues and applications
a presentation covering all the topics on Stacks and Queues in Data Structures using C++. Includes self explanatory diagrams, algorithms and program pieces.
Stack and Queue.pptx university exam preparationRAtna29
Queues and stacks are dynamic while arrays are static. So when we require dynamic memory we use queue or stack over arrays. Stacks and queues are used over arrays when sequential access is required. To efficiently remove any data from the start (queue) or the end (stack) of a data structure
STACK ( LIFO STRUCTURE) - Data StructureYaksh Jethva
Stack which is known as LIFO structure.Which is type of the Linear data structure and it is Non-Primitive data structure.
Definition:Non primitive data structure are not a basic data structure and depends on other primitive data structure (Integer,float etc).
Non primitive data structure can't be operated by machine level instruction directly.
In computer science, a stack is an abstract data type that serves as a collection of elements, with two main principal operations: push, which adds an element to the collection, and pop, which removes the most recently added element that was not yet removed.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
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Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
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2. Stack :
Stack is a list of elements in which an element may be inserted or
deleted only at one end, called the top of the stack.
Two operations mainly performed on stack:
a) Push is used to insert an element
b) Pop is used to delete an element.
Push
AAA
BBB
CCC
3. Stack operations :
1. Stack() creates a new stack that is empty. It needs no
parameters and returns an empty stack.
2. push(item) adds a new item to the top of the stack. It needs
the item and returns nothing.
3. pop() removes the top item from the stack. It needs no
parameters and returns the item. The stack is modified.
4. peek() returns the top item from the stack but does not
remove it. It needs no parameters. The stack is not
modified.
4. 5. isEmpty() tests to see whether the stack is empty. It needs
no parameters and returns a boolean value.
6. size() returns the number of items on the stack. It needs no
parameters and returns an integer.
Static Representation of Stack :
Algorithms for Push and Pop Operations on Stack :
5. PUSH(S, TOP, X)
This procedure insert an element X to the top of a stack which
is represented by S containing N elements with a pointer TOP
denoting the top element in the stack.
1. [Check stack overflow?]
If TOP >= N then :
Print OVERFLOW, and Return
2. [Increment TOP]
Set TOP := TOP +1
3. [Insert ITEM in new TOP position.]
Set S[TOP] := ITEM
4. Return
6. POP(S, TOP, ITEM)
This procedure deletes the top element of S and assigns it to the
variable ITEM.
1. [Check for stack underflow?]
If TOP = 0 then:
Print UNDERFLOW, and Return
2. [Assign TOP element to stack]
Set ITEM := S[TOP]
3. [Decreases TOP]
Set TOP := TOP -1
4. Return
7. Dynamic Representation of Stack :
Linked Representation :
The linked presentation of stack, i.e. stack is implemented using
a SLL.
The nodes are divided into two parts:
1. INFO hold the element of the stack.
2. LINK hold pointers to the next element in the stack.
AAA BBB CCC
TOP
8. PUSH_LINKSTK(INFO, LINK, TOP, AVAIL, ITEM)
This procedure pushes an ITEM into a linked stack.
1. [Available stack?]
If AVAIL=NULL then
Write OVERFLOW, and Exit
2. [Remove first node from AVAIL list.]
Set New := AVAIL and AVAIL := LINK[AVAIL]
3. [Copies ITEM into new node]
Set INFO[NEW] := ITEM
4. [New node points to the original top node in the stack]
Set LINK[NEW] := TOP
5. [Reset TOP]
Set TOP := NEW
6. Exit
9. POP_LINKSTK(INFO, LINK, TOP, AVAIL, ITEM)
This procedure deletes the top element of a linked list and assigns
it to the variable ITEM.
1. [Stack has an item to be removed?]
If TOP = NULL then Write : UNDERFLOW & Exit
2. [Copies top element into ITEM]
Set ITEM := INFO[TOP]
3. [Remember the old value of TOP pointer in TEMP and reset
TOP to point to the next element in the stack]
Set TEMP := TOP and TOP := LINK[TOP]
4. [Return deleted node to the AVAIL list]
Set LINK[TEMP := AVAIL and AVAIL := TEMP
5. Exit
10. Applications of Stack :
There are two main applications of stack:
1. Infix to Postfix
2. Evaluation of Postfix Expression
3.
11. 1. Infix to Postfix
Infix : The operator written in between the operands. Eg. A+B
Prefix : The notation in which the operator is written before the
operands, it is called Prefix. Eg. +AB
Postfix: The notation in which the operator is written after the
operands, it is called Postfix. Eg. AB+
12. Infix to Postfix: Algorithm
POLISH(Q, P)
Suppose Q is an arithmetic expression written in infix notation.
This algorithm finds the equivalent postfix expression P.
1. Push “(“ onto stack, and add “)” to the end of Q.
2. Scan Q from left to right and repeat steps 3 to 6 for each
element of Q until the STACK is empty:
3. If an operand is encountered, add it to P.
4. If a left parenthesis is encountered, push it onto STACK.
5. If an operator is encountered, then:
1. Repeatedly POP from STACK and add to P each
operator (on the top of STACK) which has the same
precedence as or higher precedence than operator.
13. 2. Add operator to stack.
[End of If Structure]
6. If a right parenthesis is encountered, then :
1. Repeatedly POP from stack and add to P each
operator (on the top of stack) until a left
parenthesis is encountered.
2. Remove the left parenthesis. [Do not add to P.]
[End of If Structure]
[End of step 2 loop]
6. Exit
14. 1. A+(B*C-(D/E^F)*G)*G
Symbol scanned STACK POSTFIX
A ( A
+ (+ A
( (+( A
B (+( AB
* (+(* AB
C (+(* ABC
- (+(- ABC*
( (+(-( ABC*
D (+(-( ABC*D
/ (+(-(/ ABC*D
E (+(-(/ ABC*DE
15. ^ (+(-(/^ ABC*DE
F (+(-(/^ ABC*DEF
) (+(- ABC*DEF^/
* (+(-* ABC*DEF^/
G (+(-* ABC*DEF^/G
) (+ ABC*DEF^/G*-
* (+* ABC*DEF^/G*-
H (+* ABC*DEF^/G*-H
) ABC*DEF^/G*-H*+
17. 2. Evaluating Postfix Notation
• Use a stack to evaluate an expression in postfix notation.
• The postfix expression to be evaluated is scanned from left
to right.
• Variables or constants are pushed onto the stack.
• When an operator is encountered, the indicated action is
performed using the top elements of the stack, and the result
replaces the operands on the stack.
19. Algorithm for evaluating a postfix expression
WHILE more input items exist
{
If symb is an operand
then push (opndstk,symb)
else //symbol is an operator
{
Opnd1=pop(opndstk);
Opnd2=pop(opndnstk);
Value = result of applying symb to opnd1 & opnd2
Push(opndstk,value);
} //End of else
} // end while
Result = pop (opndstk);