May 22, 2020

#LeetCode: Sort Characters By Frequency

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

Example 1:
Input: "tree"
Output: "eert"
Explanation:
'e' appears twice while 'r' and 't' both appear once.
So 'e' must appear before both 'r' and 't'. Therefore "eetr" is also a valid answer.

Example 2:
Input:"cccaaa"
Output:"cccaaa"
Explanation:
Both 'c' and 'a' appear three times, so "aaaccc" is also a valid answer.
Note that "cacaca" is incorrect, as the same characters must be together.

Example 3:
Input:"Aabb"
Output:"bbAa"
Explanation:
"bbaA" is also a valid answer, but "Aabb" is incorrect.
Note that 'A' and 'a' are treated as two different characters.

GIT URL: Java Solution Of Leet Code's Sort Characters By Frequency problem
Java Solution 1: Using Hash Map


Java Solution 2: Using Priority Queue

ALSO CHECKOther LeetCode Solutions in Java

-K Himaanshu Shuklaa.

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