Скачать или смотреть Find the Repeating Element in Array | 7 Powerful Approaches Explained | DSA Interview Must-Know

“7 Ways to Find the Duplicate Number | Brute → XOR → Floyd’s Cycle | Full DSA Guide”
“Find Duplicate in Array (1 to n-1) | ALL Approaches Explained | Interview Ready”
“Duplicate Number Problem | 7 Methods from Naive to Floyd’s Cycle Detection”

In this video, we solve a classic and very important DSA interview problem:

🔹 Given an array of size n containing numbers from 1 to n−1,
🔹 Exactly ONE number is repeated,
🔹 Your task is to find the repeating element.

What makes this video special is that we solve the same problem using **7 DIFFERENT APPROACHES**, starting from brute force and gradually moving to the most optimal and elegant solutions used in real interviews.

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🔥 APPROACHES COVERED IN THIS VIDEO

1️⃣ Naive Approach – Nested Loops
Time: O(n²), Space: O(1)

2️⃣ Sorting Based Approach
Time: O(n log n), Space: O(1)

3️⃣ Hash Set Approach
Time: O(n), Space: O(n)

4️⃣ Sum Formula (Mathematical Approach)
Time: O(n), Space: O(1)

5️⃣ XOR Based Approach
Time: O(n), Space: O(1)

6️⃣ Using Elements as Indexes (Sign Marking Technique)
Time: O(n), Space: O(1)

7️⃣ Floyd’s Cycle Detection Algorithm (Tortoise & Hare)
Time: O(n), Space: O(1) ⭐ (MOST IMPORTANT FOR INTERVIEWS)

Whether you're preparing for FAANG, product-based companies, coding rounds, or want to strengthen your fundamentals, this channel brings you the best structured DSA explanations with zero confusion.

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Multiple approaches (Naive → Optimized)
Time & Space complexity
Real interview insights
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Math Logic for coding (Number Theory, Combinatorics, Modular Arithmetic)
Coding interview questions with full proof and code
Competitive programming tricks and optimizations
LeetCode, GFG, Codeforces, HackerRank problem explanations
Pattern printing & logic building
Time complexity mastery

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