Day 10: Two Sum II (LeetCode 167) - Two Pointers Made Easy!

🎯 Day 10 of My LeetCode Journey | Two Sum II - Input Array Is Sorted

In this video, I solve LeetCode Problem #167 - Two Sum II, a medium-level problem that's PERFECT for mastering the Two Pointer technique! This is a classic interview question that builds on the original Two Sum problem.

🔗 Problem Link: https://leetcode.com/problems/two-sum...

📌 PROBLEM DESCRIPTION:
Given a 1-indexed array of integers that is already sorted in non-decreasing order, find two numbers such that they add up to a specific target number.

Return the indices of the two numbers (1-indexed) as [index1, index2].

Your solution must use only constant extra space.

Example 1:
Input: numbers = [2,7,11,15], target = 9
Output: [1,2]
Explanation: 2 + 7 = 9, so index1 = 1, index2 = 2

Example 2:
Input: numbers = [2,3,4], target = 6
Output: [1,3]
Explanation: 2 + 4 = 6, so index1 = 1, index2 = 3

Example 3:
Input: numbers = [-1,0], target = -1
Output: [1,2]
Explanation: -1 + 0 = -1, so index1 = 1, index2 = 2

💡 KEY CONCEPTS COVERED:
✅ Two Pointer Technique (Advanced)
✅ Exploiting Sorted Array Properties
✅ Constant Space O(1) Solution

📊 COMPLEXITY:
• Time Complexity: O(n)
• Space Complexity: O(1) - Constant space!

🎓 DIFFICULTY: Medium
🏷️ TOPICS: Array, Two Pointers

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📚 MY LEETCODE JOURNEY PLAYLIST:
   • Leetcode  

🤝 CONNECT WITH ME:
• GitHub: https://github.com/ashwinikemshetty
• LinkedIn:   / ashwinikemshetty  

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