LeetCode 217: Contains Duplicate Made Easy for Complete Beginners - Python Tutorial
LeetCode 217: Contains Duplicate – Made Easy for Complete Beginners - Python Tutorial
Struggling with LeetCode problems involving arrays and duplicates? In this beginner-friendly video, we break down LeetCode 217: Contains Duplicate step by step — using simple logic, a live code walkthrough, and clear explanations for real understanding.
You'll learn:
✅ How to approach duplicate-checking problems
✅ Brute-force vs optimized O(n) hash set solution
✅ Line-by-line code walkthrough
✅ Time & space complexity breakdown
✅ Why hash sets make duplicate detection faster
This is the perfect video for beginners looking to build a strong foundation in arrays, sets, and basic algorithm thinking — great for coding interviews and real-world Python practice.
🧠 Problem Summary:
Given an integer array nums, return true if any value appears at least twice, or false if every element is distinct.
💻 Code Language: Python
📊 Difficulty Level: Easy
🧪 LeetCode Problem Link: https://leetcode.com/problems/contain...
💻 Solution Code (Python):
def containsDuplicate(nums):
seen = set()
for num in nums:
if num in seen:
return True
seen.add(num)
return False
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