Design Gurus Logo
Frequency Sort (medium)

Problem Statement

Given a string, sort it based on the decreasing frequency of its characters.

Example 1:

Input: "Programming"
Output: "rrggmmPiano"
Explanation: 'r', 'g', and 'm' appeared twice, so they need to appear before any other character.

Example 2:

Input: "abcbab"
Output: "bbbaac"
Explanation: 'b' appeared three times, 'a' appeared twice, and 'c' appeared only once.

Constraints:

  • 1 <= str.length <= 5 * 10<sup>5</sup>
  • str consists of uppercase and lowercase English letters and digits.

Try it yourself

Try solving this question here:

Python3
Python3
. . . .

.....

.....

.....

Unlock this and all other premium problems.
No code editor for this lesson
This lesson focuses on concepts and theory