Question 1

What is the Contains Duplicate problem?

Accepted Answer

Contains Duplicate is a Easy coding problem about Array. # Contains Duplicate Given an integer array `nums`, return `true` if any value appears **at least twice** in the array, and return `false` if every element is distinct. --- ### Examples **Example 1:** ```text Input: nums = [1,2,3,1] Output: true `...

Question 2

How to solve Contains Duplicate?

Accepted Answer

To solve Contains Duplicate, you can write your solution directly in Unfoldd Arena using Python, JavaScript, Java, C++, or 10 other languages. The platform provides instant feedback, test cases, and AI-powered code analysis to help you understand the optimal approach and time complexity.

Question 3

What is the difficulty of the Contains Duplicate problem?

Accepted Answer

Contains Duplicate is a Easy-level coding problem in the Array category. It is suitable for beginners learning DSA fundamentals.

Question 4

Which companies ask Contains Duplicate in interviews?

Accepted Answer

Contains Duplicate has been reported in technical interviews at Apple, Microsoft. Practicing this problem on Unfoldd Arena will help you prepare with real test cases and AI feedback.

Property	Limit
Array Length	`1 <= nums.length <= 10^5`
Element Value	`-10^9 <= nums[i] <= 10^9`

Contains Duplicate

Contains Duplicate

Examples

Constraints

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