Leetcode 167: Two Sum II | Brute Force, Binary Search & Optimal Solution

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In this video, we solve Leetcode 167 – Two Sum II: Input Array is Sorted using three different approaches to help you fully understand the problem and its optimizations:

🔹 Brute Force – Simple nested loop logic
🔹 Binary Search – Using search for complement in sorted array
🔹 Two Pointers (Optimal) – Clean and efficient O(n) solution

📌 What you’ll learn:

Step-by-step explanation of each method

Time and space complexity comparison

When and why to use each approach

Interview-focused problem solving

👨‍💻 Perfect for beginners learning arrays, pointers, or improving brute force to optimal thinking!

🎯 This problem is commonly asked in coding interviews (including FAANG) and is great practice for using the two-pointer technique effectively.

💬 Drop your approach in the comments — let’s discuss!

#leetcode #twosumii #twopointers #binarysearch #dsa #interviewprep #codingtutorial #bruteforce #csestudent
  1. Abir Dutta
  2. leetcode
  3. binary search
  4. leetcode 167
  5. leetcode binary search
  6. binary search tree
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