Find The Duplicate Number || LeetCode Question 287 || CodingWithYash
Автор: CodingWithYash
Загружено: 2025-08-03
Просмотров: 209
Find The Duplicate Number || LeetCode Question 287 || CodingWithYash
This is one of those tricky questions that most people get wrong.
We are given an array containing n + 1 integers where each integer is in the range 1 to n
And we have to return the duplicate number but here’s the twist, the number can repeat more than once.
So in this video, I’ve explained 3 different approaches
✅ Brute force
✅ HashSet
✅ Array indexing
In the third approach, we used the array elements as indices and modified the original array but as per the LeetCode 287 constraint, we’re not allowed to modify the array.
This approach works logically, but won’t be accepted in interviews or on LeetCode.
So the acceptable optimised solution is based on Floyd’s Cycle Detection Algorithm, and we’ll be covering that when we dive into Linked List questions in upcoming videos. ✨
Save this video if you always forget the logic
Share it with your friends who are preparing for interviews.
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