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[Solved] Sort the String According to the Frequency of Character in Java

Sachin Sharma/4155/0
CodeJAVA

Problem Statement / TASK: You are given a string and your task is to sort the string according to the frequency of character and return the final string.

EXAMPLE 1 :

Input : "tree" 
Output : "eetr"

Explanation: The frequency of each character in the word is [1, 1, 2, 2] after sorting according to the frequency the output will be “eetr”.

EXAMPLE 2 :

Input : "hello"
Output : "lleho"

Solution

Approach and Algorithm

  1. First, we will make the character array of the characters of the string.
  2. Then count the frequency of each character in the string.
  3. Taking the frequency as the main array sort the character array.
  4. Then make the string of that char array.

Java Program

Prerequisite:

  • Java Programming
  • Flow Control Statements in Java
  • Java String and Its Methods

Java Code:

import java.util.Arrays;

public class SortStringByFrequency {
    public static void main(String[] args) {
        String s = "tree";
        int f[] = new int[s.length()];
        char[] st = s.toCharArray();
        for (int i = 0; i < st.length; i++) {
            f[i] = countFrequency(st, st[i]);
        }
//        System.out.println(Arrays.toString(f));
        System.out.println(sortArray(st, f));
    }

    public static int countFrequency(char[] a, char b) {
        int count = 0;
        for (char i : a){
            if (i == b)
                count++;
        }
        return count;
    }

    public static String sortArray(char[] a, int[] b) {
        int t = 0;char c;
        for (int i = 0; i < a.length - 1; i++) {
            for (int j = 0;j < a.length - i - 1;j++) {
                if (b[j] < b[j + 1]) {
                    t = b[j];
                    b[j] = b[j + 1];
                    b[j + 1] = t;

                    c = a[j];
                    a[j] = a[j + 1];
                    a[j + 1] = c;
                }
            }
        }
        System.out.println(Arrays.toString(b));
        return Arrays.toString(a);
    }
}

This is all about a code to sort the string according to the frequency of character. You can solve the above coding challenge in C/C++, Python or any of the programming languages of your choice.

coding challenge
Sachin Sharma
I am Sachin Sharma a complete JAVA geek and I also have good knowledge of Python, C, C++, and front-end development. I am a 5-star gold coder on Hckerrank in JAVA, Python, C++, and DSA. I am eager to share my coding knowledge to help people.

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Why?

Why Competitive Programming Important?

Coding Challenges for Practice

  1. Count Common Factor
  2. Does it Divide
  3. Sum of Sub Arrays
  4. Pair of Desired Sum
  5. Remove Duplicate Char from String
  6. Sort String by Char Freq (Python)
  7. Sort String by Char Freq (Java)
  8. Split Array into Equal Sum Subarray
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  10. Validate PAN Card Number
  11. Validate Sudoku
  12. Sort Circular Rotated Array
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  14. Min Cost to Paint All Houses [Amazon]
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  19. Secure Conversation by Encry/Decry
  20. Special Elements in Matrix
  21. Next Greater No with Same set of Digits
  22. Smallest Subarray with Sum Greater than Given Number
  23. Group Anagrams
  24. Find Duplicates in Array in O(n)
  25. Find Two Unique Numbers from Array in O(n)
  26. Number Patterns & Finding Smallest Number
  27. First Unique Element in a Stream
  28. Flip Equivalent Binary Trees [TeachMint]
  29. Minimum Cost of Merging Files [Amazon]
  30. Minimum Distance for Truck to Deliver Order [Amazon]
  31. Order Task for Given Dependencies
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  34. Max Sum Subarray
  35. Max Avg Sum of Two Subsequences
  36. Merge Overlapping Intervals
  37. Longest Balanced Subarray
  38. Longest Path in a Weighted Tree
  39. Generate Balanced Parentheses
  40. PostOrder Traversal Without Recursion

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