Arrays & Strings

Master array manipulation, string operations, and two-pointer techniques

4 chapters 13 lessons 128 min total

Introduction to Arrays

4 lessons · 29 min

FREE

What is an Array

Understanding array data structure and memory layout

Array Declaration and Initialization

Creating arrays in different languages

Accessing and Modifying Elements

Index-based access and mutation

Array Traversal Patterns

Forward, backward, and skip traversals

String Fundamentals

3 lessons · 29 min

5 credits

Strings as Character Arrays

How strings are stored in memory

String Manipulation Methods

Common operations: reverse, substring, concat

String Comparison and Matching

Equality, lexicographic order, pattern matching

Two Pointer Technique

3 lessons · 30 min

5 credits

Introduction to Two Pointers

When and why to use two pointers

Opposite Direction Pointers

Palindrome check, container with most water

Same Direction Pointers

Remove duplicates, sliding window basics

Sliding Window

3 lessons · 40 min

5 credits

Fixed Size Window

Maximum sum subarray of size k

Variable Size Window

Longest substring without repeating characters

Window with HashMap

Minimum window substring and anagram problems