NeetCode #128LC-1461MediumArrays & Hashing
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#128 · #1461 · Check If a String Contains All Binary Codes of Size K(检查一个字符串是否包含所有长度为 K 的二进制子串)

📌 Problem Statement & Constraints

Given a binary string s and an integer k, return true if every binary code of length k appears as a substring of s. Constraints: 1 <= s.length <= 5 * 10^5, 1 <= k <= 20.
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