Leetcode Problem 451. Sort Characters By Frequency

451. Sort Characters By Frequency

Leetcode Solutions

Create a HashMap to store the frequency of each character in the string.
Find the maximum frequency to determine the size of the bucket array.
Create the bucket array where each index corresponds to a frequency and holds a list of characters with that frequency.
Iterate over the HashMap and add each character to the appropriate bucket based on its frequency.
Initialize a StringBuilder for the result.
Iterate over the buckets in reverse order and append the characters to the StringBuilder, repeating each character based on its frequency.
Convert the StringBuilder to a string and return it.

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