Coding Interview Walkthrough: Detect Duplicates in an Array (Step-by-Step)
Автор: Rita Kattsyna
Загружено: 2026-01-09
Просмотров: 11
In this video, I walk through a real coding interview question exactly the way interviewers expect you to think and communicate.
Interview Question:
Write a function that determines if an array contains any duplicate values.
Step-by-Step Breakdown
🔹 Step 1: Understand the Problem
Identify inputs & outputs
Ask clarifying questions
🔹 Step 2: Discuss the Approach
Brute Force → O(n²)
Sorting → O(n log n)
HashSet (Chosen Approach) → O(n) time, O(n) space
🔹 Step 3: Code the Solution (Java)
Use a HashSet to track seen values
Return early when a duplicate is found
🔹 Step 4: Test & Debug
Walk through real examples
Handle edge cases
⏱ Time & Space Complexity
Time: O(n)
Space: O(n)
Perfect for:
FAANG / Big Tech interviews
Data Structures & Algorithms prep
Anyone learning how to think out loud during interviews
If this helped you, like, subscribe, and drop a comment with the next problem you want solved!
#CodingInterview #DataStructures #Algorithms #Java #HashSet #LeetCode #InterviewPrep #SoftwareEngineering
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