LeetCode 1461 | Check If a String Contains All Binary Codes of Size K | Daily LeetCode | Day 54/365

😄 When binary codes start playing Pokémon — gotta catch ’em all! ⚡💻

LeetCode 1461 | Check If a String Contains All Binary Codes of Size K | Daily LeetCode | Day 54/365 | Sliding Window + Hashing | C++ Solution

In today’s video, we solve LeetCode 1461: Check If a String Contains All Binary Codes of Size K, where we must verify whether every possible binary substring of length k exists inside a given string.

🧠 Core Idea:
• Total required binary codes = (2^k)
• Use a sliding window of size k
• Store substrings (or encoded values) in a hash set
• If unique count equals (2^k) → return true

This converts an exponential concept into an efficient linear solution 🔥

📌 What you’ll learn in this video:
• Sliding window technique for substrings
• Using hashing to track unique patterns
• Bitmask optimization idea
• Early stopping optimization
• Clean and interview-ready C++ implementation
• Time & space complexity explanation

⏱ Time Complexity: O(n)
💾 Space Complexity: O(2^k)

💻 Problem Link:
https://leetcode.com/problems/check-if-a-string-contains-all-binary-codes-of-size-k/

🎯 Why this problem matters:
This problem strengthens your understanding of sliding window + hashing patterns, a powerful combo frequently tested in coding interviews and contests.

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