Stacks
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A stack is a data structure that follows the last-in, first-out (LIFO) principle. Items are added to the top of the stack using a push operation and removed from the top using a pop operation. Stacks can be implemented using either an array or a linked list. With an array, the top index must be tracked, while with a linked list, the top is the first node in the list. Both implementations allow push and pop operations to occur in constant time.
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Introduction Implement a stack using singly linked list To implement a stack using singly linked
list concept, all the singly linked list operations are performed based on Stack operations
LIFO(last in first out) and with the help of that knowledge we are going to implement a stack
using single linked list. Using singly linked lists, we implement stack by storing the information
in the form of nodes and we need to follow the stack rules and implement using singly linked list
nodes. So we need to follow a simple rule in the implementation of a stack which is last in first
out and all the operations can be performed with the help of a top variable .Let us learn how to
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easily implemented using the linked list. In stack Implementation, a stack contains a top pointer.
which is "head" of the stack where pushing and popping items happens at the head of the list.
First node have null in link field and second node link have first node address in link field and so
on and last node address in "top" pointer. The main advantage of using linked list over an arrays
is that it is possible to implement a stack that can shrink or grow as much as needed. In using
array will put a restriction to the maximum capacity of the array which can lead to stack
overflow. Here each new node will be dynamically allocate. so overflow is not possible. Stack
Operations: 1. push() : Insert a new element into stack i.e just inserting a new element at the
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La Unión Europea ha propuesto un nuevo paquete de sanciones contra Rusia que incluye un embargo al petróleo. El embargo prohibiría las importaciones de petróleo ruso por mar y por oleoducto, aunque se concederían exenciones temporales a Hungría y Eslovaquia. Este embargo sería la sanción económica más dura contra Rusia hasta la fecha en respuesta a su invasión continua de Ucrania.
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Stacks
- 1. Stacks
- 2. Stacks A stack is a sequence of items that are accessible at only one end of the sequence. Stacks 2
- 3. Pushing/Popping a Stack Because a pop removes the item last added to the stack, we say that a stack has LIFO (last-in/ first-out) ordering. Stacks 3
- 4. TOP – THE MOST RECENTLY INSERTED ITEM PUSH - TO INSERT ONTO THE TOP OF A STACK POP - TO REMOVE THE TOP ITEM IN A STACK Stacks 4
- 5. Stack Implementations Stacks 5 Array based Where is top? How are elements added, removed? Linked List based Where is top? How are elements added, removed? Efficiency of operations
- 6. Array Based Stack Implementation Where should top be? Stacks 6 12 15 5 2 3 4 stack [0] array What are array values? s.push (20) s.pop( )
- 7. Linked List Implementation Stacks 7 D C B t o p A S t a c k D C B A L i n k e d L i s t f r o n t s.push (‘F’) s.pop( )
- 8. Stack with a Singly Linked List We can implement a stack with a singly linked list The top element is stored at the first node of the list The space used is O(n) and each operation of the Stack ADT takes O(1) time t Æ Stacks 8 nodes elements
- 9. Thank You
- 10. Stacks 10