Stacks and Queues Implementation A stack is a LIFO (last-in, first-out) data structure that stores elements in the order they are added. It uses a set o...
Stacks and Queues Implementation
A stack is a LIFO (last-in, first-out) data structure that stores elements in the order they are added. It uses a set of 'stack pointers' to keep track of the top element.
To push (add) an element onto a stack, we add it to the end of the set.
stack.append(element)
To pop (remove) the top element from a stack, we remove it from the end of the set.
element = stack.pop()
A queue is a FIFO (first-in, first-out) data structure that stores elements in the order they are inserted. It uses a queue of 'queue pointers' to keep track of the elements.
To enqueue (add) an element to a queue, we insert it at the front of the queue.
queue.Enqueue(element)
To dequeue (remove) the front element from a queue, we remove it from the front of the queue.
element = queue.Dequeue()
Key Differences:
Stack: Last-in, first-out.
Queue: First-in, first-out.
Applications:
Stacks:
Reverse a linked list.
Implement a parser for a syntax tree.
Undo/redo functionality.
Queues:
Job scheduling.
Message passing.
Threading