Counting Kind Out Inward Coffee - Example

The Counting kind algorithm, similar Radix sort together with Bucket sort, is an integer based algorithm (i.e. the values of the input array are assumed to move integers), non-comparison together with linear sorting algorithm. Hence counting kind is amid the fastest sorting algorithms around, inwards theory. It is too i of the few linear sorting algorithms or O(n) sorting algorithm. It's quite mutual inwards Java interviews nowadays to ask, whether do you lot know whatsoever O(n) sorting algorithm or not. If you lot confront this enquiry inwards future, you lot tin advert Radix sort, Bucket sort, or Counting kind algorithms.  How does the counting kind algorithm works? Well, counting kind creates a bucket for each value together with proceed a counter inwards each bucket. Then each fourth dimension a value is encountered inwards the input collection,  the appropriate counter is incremented.

Because Counting kind algorithm creates a bucket for each value, an imposing restriction is that the maximum value inwards the input array is known beforehand. Once every value is inserted into the bucket, you lot but acquire through count array together with impress them upwards depending upon their frequency.

For example, if the input array contains 0 (zero) v times so at the zeroth index of count array you lot would convey 5. Now, you lot tin impress aught 5 times earlier printing 1 depending upon its count. This way, you lot acquire a sorted array.

Btw, at that spot is a large release of counting kind algorithm implementation code on the Internet, including on academy websites, that erroneously claim to move bucket sort.

There is a key departure betwixt Bucket Sort together with Counting sort, for example, Bucket kind uses a hash business office to distribute values; counting sort, on the other hand, creates a counter for each value therefore it is called Counting Sort algorithm. You tin farther cheque a comprehensive course of teaching like Data Structures together with Algorithms: Deep Dive Using Java to larn to a greater extent than nearly it.




How to implement Counting Sorting inwards Java

You tin follow below steps to implement counting kind algorithm inwards Java:

1. Since the values attain from 0 to k, create k+1  buckets. For example, if your array contains 0 to 10 so do eleven buckets for storing the frequency of each number. This array is too called a frequency array or count array.

2. To fill upwards the buckets, iterate through the input array together with each fourth dimension a value appears, increment the counter inwards its bucket.

3. Now fill upwards the input array amongst the compressed information inwards the buckets. Each bucket's key represents a value inwards the array. So for each bucket, from smallest key to largest, add together the index of the bucket to the input array together with decrease the counter inwards the said bucket past times one; until the counter is zero.

Time Complexity of the Counting Sort is O(n+k) in the best case, average instance together with worst case, where n is the size of the input array together with k is the values ranging from 0 to k. If you lot desire to larn to a greater extent than nearly how to calculate fourth dimension together with infinite complexity of an algorithm, delight take in a telephone commutation course of teaching like integer array using counting kind algorithm. * input: [60, 40, 30, 20, 10, 40, 30, 60, 60, 20, 40, 30, 40] * output: [10, 20, 20, 30, 30, 30, 40, 40, 40, 40, 60, 60, 60] * * Time Complexity of Counting Sort Algorithm: * Best Case O(n+k); Average Case O(n+k); Worst Case O(n+k), * where n is the size of the input array together with k agency the * values attain from 0 to k. * */ public class CountiSorter{ public static void main(String[] args) { System.out.println("Counting kind inwards Java"); int[] input = { 60, 40, 30, 20, 10, 40, 30, 60, 60, 20, 40, 30, 40 }; int k = 60; System.out.println("integer array earlier sorting"); System.out.println(Arrays.toString(input)); // sorting array using Counting Sort Algorithm countingSort(input, k); System.out.println("integer array afterwards sorting using counting kind algorithm"); System.out.println(Arrays.toString(input)); } public static void countingSort(int[] input, int k) { // do buckets int counter[] = new int[k + 1]; // fill upwards buckets for (int i : input) { counter[i]++; } // kind array int ndx = 0; for (int i = 0; i < counter.length; i++) { while (0 < counter[i]) { input[ndx++] = i; counter[i]--; } } } } Output Counting kind inwards Java integer array earlier sorting [60, 40, 30, 20, 10, 40, 30, 60, 60, 20, 40, 30, 40] integer array afterwards sorting using counting kind algorithm [10, 20, 20, 30, 30, 30, 40, 40, 40, 40, 60, 60, 60]

You tin take in that our concluding array is forthwith sorted inwards the increasing gild using Counting kind algorithm. This is real useful if you lot convey an integer array where values are non inwards a relatively small-scale range. If you lot are interested inwards around practical uses cases together with to a greater extent than information on this linear fourth dimension sorting algorithm, I propose you lot read the classic CLRS majority on Algorithms. Introduction to Algorithms

 the values of the input array are assumed to move integers Counting Sort inwards Java - Example



Counting Sort FAQ

Here is around of the ofttimes asked enquiry nearly Counting kind algorithm on interviews:

1. Is counting kind stable algorithm?
Yes, The counting kind is a stable kind similar multiple keys amongst the same value are placed inwards the sorted array inwards the same gild that they appear inwards the master copy input array. See here to larn to a greater extent than nearly the departure betwixt stable together with unstable sorting algorithms similar Mergesort (a stable sorting algorithm)  together with Quicksort (unstable sorting algorithm).


2. When do you lot role counting kind algorithm?
In practice, nosotros commonly role counting kind algorithm when having k = O(n), inwards which instance running fourth dimension is O(n).


3. Is counting kind inwards house Algorithm?
It is possible to modify the counting kind algorithm so that it places the numbers into sorted gild inside the same array that was given to it equally the input, using alone the count array equally auxiliary storage; however, the modified in-place version of counting kind is non stable. See a proficient algorithm course of teaching like Data Structures together with Algorithms: Deep Dive Using Java on Udemy to larn nearly them


4. How does counting kind works?
As I said before, it get-go creates a count or frequency array, where each index represents the value inwards the input array. Hence you lot demand a count array of k+1 to kind values inwards the attain 0 to k, where k is the maximum value inwards the array. So, inwards gild to kind an array of 1 to 100, you lot demand an array of size 101.

After creating a count array or frequency array you lot but acquire through input array together with increment counter inwards the respective index, which serves equally a key.

For example, if 23 appears iii times inwards the input array so the index 23 volition incorporate 3. Once you lot do frequency array, but acquire through it together with impress the release equally many times they appear inwards count array. You are done, the integer array is sorted now.

Here is a diagram which explains this beautifully:

 the values of the input array are assumed to move integers Counting Sort inwards Java - Example



5. Is counting sort, a comparing based algorithm?
No, the counting kind is non a comparing based algorithm. It's genuinely a non-comparison sorting algorithm. See here to larn to a greater extent than nearly the departure betwixt comparing together with non-comparison based sorting algorithm.


6. Can you lot role counting kind to kind an array of String?
No, counting kind is an integer based sorting algorithm, it tin alone kind an integer array or release array similar short, byte or char array.


That's all nearly Counting kind inwards Java. This is i of the useful O(n) sorting algorithm for sorting integer array. the linear sorting algorithm is a useful concept to remember, they are real pop nowadays on interviews. Influenza A virus subtype H5N1 pair of other linear sorting algorithms are Bucket kind together with Radix sort. Just recall that you lot tin alone kind integer array using counting kind algorithm together with you lot demand to know the maximum value inwards the input array beforehand.


Further Learning
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  • Thanks for reading this article. If you lot similar this article so delight percentage amongst your friends together with colleagues. If you lot convey whatsoever enquiry or proposition so delight drib a comment together with I'll endeavour to observe an response for you.

    P. S. - If you lot are looking for around Free Algorithms courses to meliorate your agreement of Data Structure together with Algorithms, so you lot should too cheque this listing of Free Data Structure together with Algorithms Courses for Programmers.

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