Grokking 75: Top Coding Interview Questions
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Solution: Sort Characters By Frequency
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Problem Statement

Given a string, arrange its characters in descending order based on the frequency of each character. If two characters have the same frequency, their relative order in the output string can be arbitrary.

Example

  1. Input: s = "trersesess"
    • Expected Output: "sssseeerrt"
    • Justification: The character s appears four times, e three times, r two times and t only once. All characters are sorted based on their frequnecy.
  2. Input: s = "banana"
    • Expected Output: "aaannb".

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