DSA SUB PATTERNS AND PROBLEMS

Detailed Sub-Patterns Explanation Guide

1. Two Pointers Patterns

1.1 Opposite Direction Two Pointers

Core Concept: Use two pointers starting from opposite ends of an array, moving them towards each other based on certain conditions.

Key Insights:

• Usually works on sorted arrays or when you need to find pairs/triplets

• Time Complexity: O(n) - much better than ne…