Gopal Goswami’s Post

🚀 Efficient Duplicate Detection with Hash Sets | LeetCode Today, I tackled the Contains Duplicate problem. While the brute force approach is often the first instinct, optimizing for time complexity is where the real fun begins! 💡 The Problem: 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. ⚡ My Approach: I utilized a Hash Set to track elements as I traversed the array. This allows for near-instantaneous lookups compared to nested loops. 👉 The Logic: Initialize an empty set seen. Iterate through the array once. For each number, check: "Have I seen this before?" (Is it in the set?) If Yes → Return True immediately. If No → Add the number to the set and keep moving. 🔥 Complexity Analysis: ⏱ Time Complexity: $O(n)$ – We only pass through the list once. 📦 Space Complexity: $O(n)$ – In the worst case (all unique elements), we store all $n$ elements in the set. 🏆 The Result: ✔️ Accepted: All 77 test cases passed. ✔️ Performance: 9 ms runtime, beating 73.44% of Python3 submissions! 📌 Key Takeaway: Using a Set turns a potential $O(n^2)$ search into a sleek $O(n)$ operation. Choosing the right data structure isn't just about passing tests; it's about writing scalable, "production-ready" code. 💻 Tech Stack: #Python | #DataStructures | #Algorithms #leetcode #dsa #coding #programming #softwareengineering #100DaysOfCode #pythonprogramming #tech #growthmindset

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