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Grokking the Coding Interview Patterns in C++

Solution: Base 7

Understand how to convert integers to base 7 using repeated division and remainder collection. This lesson guides you through handling positive and negative numbers, optimizing the approach while ensuring clear implementation with logarithmic time complexity.

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Statement

Given an integer num, return a string representing its base 77 equivalent.

Constraints:

  • −107≤-10^7 \leq num ≤107\leq 10^7

Solution

The core idea behind this problem is standard base conversion using repeated division. To convert a decimal integer to its base 77 representation, we repeatedly divide the number by 7 ...