String-3 | 387. First Unique Character in a String | 🔥 Beginner, Medium & Advanced Level!
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3 Months DSA for Placements! 🚀 Beginner to Advanced Playlist
🔍 Leetcode 387: First Unique Character in a String - HashMap Approach Explained! 🔍
🚀 In this video, we solve the First Unique Character in a String problem from Leetcode (#387) using the HashMap approach, ensuring an efficient solution in O(n) time complexity.
✅ HashMap Approach:
1️⃣ First Pass: Iterate through the string and store character frequencies in a HashMap.
2️⃣ Second Pass: Iterate again and return the index of the first character with a frequency of 1.
3️⃣ Optimized Solution: Uses O(n) time and O(1) space, as there are only 26 lowercase English letters.
📌 What You’ll Learn:
✔️ Problem statement & examples
✔️ Step-by-step coding walkthrough
✔️ Time & space complexity analysis
✔️ Edge cases and optimizations
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💬 Got questions? Drop a comment below, and let’s discuss! 🚀
🔖 Hashtags:
#Leetcode #FirstUniqueCharacter #CodingInterview #DataStructures #Algorithms #Leetcode387 #Python #Java #CPlusPlus #DSA #SoftwareEngineering #CodingChallenge #InterviewPreparation #Programming #HashMapApproach #EfficientCoding
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