Daily Coding Problem: Problem #1140 [Hard]

Good morning! Here's your coding interview problem for today.

This problem was asked by LinkedIn.

Given a set of characters C and an integer k, a De Bruijn sequence is a cyclic sequence in which every possible k-length string of characters in C occurs exactly once.

For example, suppose C = {0, 1} and k = 3. Then our sequence should contain the substrings {'000', '001', '010', '011', '100', '101', '110', '111'}, and one possible solution would be 00010111.

Create an algorithm that finds a De Bruijn sequence.

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