LeetCode 3713 | Longest Balanced Substring I 🔥 | Brute Force + Optimization | O(n²) Explained

Описание: In today’s LeetCode POTD, we solve 3713. Longest Balanced Substring I (Medium).

A substring is called balanced when all distinct characters in it appear the same number of times. Sounds simple? 🤔 But the trick is in how we efficiently check the condition without scanning the frequency array again and again.

Solution: https://leetcode.com/problems/longest...

In this video, we cover:

✔️ Problem intuition
✔️ Brute force approach
✔️ Optimized frequency tracking method
✔️ Why len == distinct × maxFreq works
✔️ Step-by-step dry run with example
✔️ Clean Java implementation
✔️ Time & Space Complexity analysis

💡 Key Concept:
Instead of checking all 26 characters every time, we maintain:
• distinct count
• max frequency

And use a mathematical condition to validate balance in O(1).

⸻

⏱ Time Complexity: O(n²)
📦 Space Complexity: O(n)

If you’re preparing for coding interviews or solving LeetCode daily, this problem builds strong fundamentals in:
• Frequency arrays
• Substring problems
• Hashing logic
• Optimization thinking

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