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Solution: Find The K-th Lucky Number

Explore how to determine the k-th lucky number composed of digits 4 and 7 by applying bitwise manipulation and binary representation techniques. Understand the step-by-step approach to convert the given number into a lucky number string and analyze the time and space complexity of this method.

Statement

A number is called lucky if it comprises only the digits 44 and 77. Your task is to return the k-th lucky number as a string for a given integer k

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