LeetCode 167: Two Sum II - Input Array Is Sorted (C++) | Brute Force + Two Pointers Explained

Description:

Welcome back to the LeetCode series 🚀

Today, we solve LeetCode 167 — Two Sum II: Input Array Is Sorted using C++.

In this video, we first look at the brute-force approach and then optimize the solution using the Two Pointer technique. Since the array is already sorted, we can solve the problem efficiently in O(N) time and O(1) extra space.

📌 Topics Covered:
- Brute Force Approach
- Two Pointer Technique
- Code Explanation
- Dry Run
- Time & Space Complexity Analysis

💻 Language Used: C++

⏱️ Timestamps:

0:00 - Introduction & Problem Statement
0:32 - The 1-Based Indexing Catch
0:52 - The Brute Force Approach O(N^2)
1:07 - Brute Force Code Implementation
2:23 - The Two Pointer Intuition: Why sorting changes everything
3:13 - Optimal C++ Code Implementation O(N)
4:30 - Explanation of the Optimal Logic
5:34 - Dry Run: Moving the Pointers Step-by-Step
7:05 - Time & Space Complexity Breakdown O(N) / O(1)
7:15 - Conclusion

🔗 Problem Link:
https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/

🔗 Solution Code:
https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/solutions/8281883/mastering-two-sum-iithe-shrinking-search-ar7v

#LeetCode #CPP #DSA #TwoPointers #CodingInterview #Algorithms #Programming

Видео LeetCode 167: Two Sum II - Input Array Is Sorted (C++) | Brute Force + Two Pointers Explained канала Patel Jivan