Most important data structure and algorithms topics are?

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Most Important data structure and algorithms topics are:
1- Linked List – Single and Doubly
2- Stack
3- Queues
4- Binary Search Trees or general Binary Tree
5- Heaps
6- Basic Graph Traversal and Shortest Path
7- Hashing

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Disadvantages of Array over Linked List

Disadvantages of Array over Linked List

  1. Total number of elements need to be mentioned or the memory allocation needs to be done at the time of array creation
  2. The size of array, once mentioned, cannot be increased in the program. If number of elements entered exceed the size of the array ARRAY OVERFLOW EXCEPTION occurs.