Difficulty: Medium
Tags: LeetCode, Medium, Bit Manipulation, Hash Table, String, Hash Function, Rolling Hash, leetcode-1461, O(n * k), O(k * 2^k)

Problem

Given a binary string s and an integer k, return true if every binary code of length k is a substring of s. Otherwise, return false.

Example 1:

Input: s = "00110110", k = 2
Output: true
Explanation: The binary codes of length 2 are "00", "01", "10" and "11". They can be all found as substrings at indices 0, 1, 3 and 2 respectively.

Example 2:

Input: s = "0110", k = 1
Output: true
Explanation: The binary codes of length 1 are "0" and "1", it is clear that both exist as a substring.

Example 3:

Input: s = "0110", k = 2
Output: false
Explanation: The binary code "00" is of length 2 and does not exist in the array.

Constraints:

1 <= s.length <= 5 * 10⁵
s[i] is either '0' or '1'.
1 <= k <= 20