The Key Observation That Solves 961. N-Repeated Element in Size 2N Array

Описание: In this video, we solve LeetCode 961 – N-Repeated Element in Size 2N Array using a simple observation-based approach.

The key insight is that since one element appears N times in a size 2N array, it must repeat within a very small window. This allows us to solve the problem in O(n) time and O(1) space without using extra data structures.

This problem is part of today’s LeetCode Daily Problem of the Day (POTD).

🔹 Topics covered:
• Observation-based problem solving
• Array traversal
• Optimized O(1) space solution

Clear problem explanation, Step-by-step approach/logic/walkthrough and live coding in Java/Python

Problem link - https://leetcode.com/problems/n-repea...

Java Code - https://pastebin.com/nkUQ28Sv
Python Code - https://pastebin.com/F85wHUzr

Time complexity - O(N)
Space Complexity - O(1)

Page Marker Extension - https://chromewebstore.google.com/det...

Video Chapters -
00:00 - Problem Statement
02:17 - Approach
09:16 - Code
12:06 - Time and Space Complexity


Leetcode daily playlist -    • LeetCode Daily Problems  

LeetCode Easy POTD playlist -    • LeetCode Easy  

LeetCode Medium POTD playlist -    • LeetCode Medium  

LeetCode Hard POTD playlist -    • LeetCode Hard  

If you want to practice daily and improve your problem-solving skills, this is the place to follow along.

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