First Unique Character in a String | Easy | Leetcode 387
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👉 Google Amazon Ask This! 🔥 First Non-Repeating Character | LeetCode 387 Explained
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Govind Pothuraju on Instagram: "Day 26/200: First Unique Character in a String – LeetCode 387 Given a string, return the index of the first non-repeating character. If it doesn’t exist, return -1. ❌ Brute force O(n²): Check frequency of each character individually. ✅ HashMap / Frequency array O(n): Count characters, then find the first unique one. ⚡ A must-know string hashing problem that builds the foundation for problems like anagrams and sliding window challenges. Follow @codewith_govind for
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