Table of Content

1. Arrays

Definition: An array is a linear data structure that stores elements of the same data type in a contiguous block of memory. Each element in the array is uniquely identified by its position or index, starting from zero for the first element.

Analogy: Imagine an array as a row of mailboxes in an apartment building. Each mailbox has a unique number, starting from 0 and going up sequentially. These mailboxes are lined up in a neat row, just like elements in an array.

Key Characteristics:

• Fixed Size: All elements are of the same size and data type.
• Sequential Access: Elements are accessed using an index.
• Contiguous Memory: Elements are stored next to each other in memory.
• Ordered and Indexed: Elements are ordered and indexed from 0 to N-1.

Advantages:

• Efficient Data Storage: Contiguous allocation of memory.
• Random Access: Direct access to elements using their index.
• Versatility: Can represent various data types, from simple integers to complex objects.

Basic Operations:

Types of Arrays:

2. Two Pointers

Introduction: The two-pointer technique is a fundamental approach for efficiently solving problems involving arrays. It involves using two pointers to navigate through an array, starting from different points, and moving them based on certain conditions to find a solution.

Example Problem: Two Sum