Leetcode Problem 1636. Sort Array by Increasing Frequency

1636. Sort Array by Increasing Frequency

Leetcode Solutions

Sorting with Custom Comparator

  1. Create a hash map to store the frequency of each number in the array.
  2. Iterate through the array and update the frequency count for each number in the hash map.
  3. Sort the array using a custom comparator that:
    • Compares the frequency of two numbers and orders them in ascending order if they are different.
    • If two numbers have the same frequency, it orders them in descending order based on their value.
  4. Return the sorted array.
UML Thumbnail

Frequency Counting and Bucket Sort

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