✍Beginner-Friendly Guide 'Check If a String Contains All Binary Codes of Size K' - Problem 1461 (C++, Python, JavaScript)

Binary strings are the DNA of computing, representing everything from simple numbers to complex encrypted files. This problem challenges you to determine if a long sequence of data contains every possible "word" of a specific length, a task that mirrors how scanners detect patterns or corruption in digital streams. Problem Summary You're given: A binary string s consisting of only '0's and '1's. An integer k representing the required length of each binary substring. Your goal: Return true if every possible binary code of length k exists as a substring within s . Otherwise, return false . Intuition To solve this efficiently, we first need to know how many unique binary codes exist for a given length . Since each position can be either a 0 or a 1, there are total unique combinations. Instead of searching for every possible code one by one, we use a Sliding Window approach combined with a Hash Set or a boolean array. We slide a window of size across the string s , convert that window into