Solution: Find The K-th Lucky Number

Explore how to generate the k-th lucky number made up of digits 4 and 7 by transforming the integer k through bitwise manipulation. This lesson guides you step-by-step in converting k into a binary-like string and replacing bits to construct the lucky number efficiently, with a time complexity of O(log k). Understand how to apply bitwise operations and string manipulation to solve this pattern-based problem confidently.