Square Root | Leetcode 69(C++) | Binary Search & Numbers

🚀 LeetCode 69 — Sqrt(x) | C++ Solution Explained
In this video, we solve LeetCode Problem 69 – Sqrt(x) in a simple and beginner-friendly way using C++.
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📌 TOPICS COVERED
✅ Binary Search
✅ Math
✅ Searching Algorithms
✅ Integer Manipulation
✅ Optimization Techniques
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📌 PROBLEM OVERVIEW
Given a non-negative integer x, return the square root of x rounded down to the nearest integer.
👉 You must not use any built-in exponent function or operator.
Example:
Input:
C++
x = 8
Output:
C++
2
Explanation: The square root of 8 is 2.828..., so return 2.
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🛠️ APPROACH COVERED
✅ Use Binary Search on the range [1, x]
✅ Find the middle value
✅ Compare mid * mid with x
✅ Store the possible answer and continue searching
Method → Binary Search
Language → C++
Time → O(log x)
Space → O(1)
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🎯 WHAT YOU WILL LEARN
✔ Binary search fundamentals
✔ Efficient searching techniques
✔ Avoiding overflow using long long
✔ Writing optimized mathematical logic
✔ Time & space complexity analysis
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Видео Square Root | Leetcode 69(C++) | Binary Search & Numbers канала Anisha Chhajer