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Chapter 5: Data Structures

Arrays

An array is a collection of elements stored at contiguous memory locations.

Key Operations

  • Access: O(1) - Direct index access
  • Search: O(n) - Linear search
  • Insert: O(n) - May require shifting
  • Delete: O(n) - May require shifting

💡 Tip: Use arrays when you need fast random access and know the size upfront.

Linked Lists

A linked list consists of nodes where each node contains data and a reference to the next node.

Types

  1. Singly Linked List - One direction
  2. Doubly Linked List - Two directions
  3. Circular Linked List - Last points to first

When to Use

Use Array WhenUse Linked List When
Size is knownSize varies
Random access neededSequential access
Memory is limitedFrequent insertions

Summary

  • Arrays: Fast access, fixed size
  • Linked Lists: Flexible size, sequential access

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