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Added Linked List #8

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19 changes: 19 additions & 0 deletions README.md
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A menu driven c++ program for operations on linked lists(singly and doubly).
Basic operations like insert(end,beginning,specific index), delete, reverse and print.
Another menu driven program for stacks and queues(as arrays and as linked lists).


### Why Linked List?
Arrays can be used to store linear data of similar types, but arrays have following limitations.
1) The size of the arrays is fixed: So we must know the upper limit on the number of elements in advance. Also, generally, the allocated memory is equal to the upper limit irrespective of the usage.
2) Inserting a new element in an array of elements is expensive, because room has to be created for the new elements and to create room existing elements have to shifted.

For example, in a system if we maintain a sorted list of IDs in an array id[].

id[] = [1000, 1010, 1050, 2000, 2040].
And if we want to insert a new ID 1005, then to maintain the sorted order, we have to move all the elements after 1000 (excluding 1000).
Deletion is also expensive with arrays until unless some special techniques are used. For example, to delete 1010 in id[], everything after 1010 has to be moved.

Advantages over arrays
1) Dynamic size
2) Ease of insertion/deletion


https://www.geeksforgeeks.org/data-structures/linked-list/#circularLinkedList