LeetCode 349 - Intersection of Two Arrays | Hash Set Solution in C++ | Easy DSA Interview Question
In this video, I solve LeetCode 349 - Intersection of Two Arrays using an efficient Hash Set approach in C++.
We are given two integer arrays nums1 and nums2. The task is to return an array containing their intersection. Each element in the result must be unique, and the order of the result does not matter.
🔹 Problem: LeetCode 349 - Intersection of Two Arrays
🔹 Language: C++
🔹 Topic: Arrays, Hash Set, STL
🔹 Difficulty: Easy
📌 Approach:
• Store all elements of nums1 in an unordered_set.
• Traverse nums2 and check whether the current element exists in the set.
• If found, add it to the answer and remove it from the set.
• Removing prevents duplicate entries in the result.
• Return the final intersection array.
⏱ Time Complexity: O(n + m)
📦 Space Complexity: O(n)
Where:
n = size of nums1
m = size of nums2
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📚 What You'll Learn:
✅ Hash Set Fundamentals
✅ Removing Duplicates Efficiently
✅ STL unordered_set Usage
✅ Array Lookup Optimization
✅ Interview-Friendly Hashing Techniques
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🔗 GitHub Repository:
https://github.com/ronitkumarsoni/lee...
🔗 LeetCode Profile:
https://leetcode.com/
🔗 LinkedIn Profile:
/ ronit-kumar-soni
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🎯 Suitable For:
• Coding Interviews
• DSA Preparation
• Placement Preparation
• LeetCode Practice
• Software Engineering Interviews
• Beginner Programmers
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