Counting Sort

Difficulty Level : Easy
Last Updated : 04 Nov, 2020

Counting sort is a sorting technique based on keys between a specific range. It works by counting the number of objects having distinct key values (kind of hashing). Then doing some arithmetic to calculate the position of each object in the output sequence.

Let us understand it with the help of an example.

For simplicity, consider the data in the range 0 to 9. 
Input data: 1, 4, 1, 2, 7, 5, 2
  1) Take a count array to store the count of each unique object.
  Index:     0  1  2  3  4  5  6  7  8  9
  Count:     0  2  2  0   1  1  0  1  0  0

  2) Modify the count array such that each element at each index 
  stores the sum of previous counts. 
  Index:     0  1  2  3  4  5  6  7  8  9
  Count:     0  2  4  4  5  6  6  7  7  7

The modified count array indicates the position of each object in 
the output sequence.
 
  3) Output each object from the input sequence followed by 
  decreasing its count by 1.
  Process the input data: 1, 4, 1, 2, 7, 5, 2. Position of 1 is 2.
  Put data 1 at index 2 in output. Decrease count by 1 to place 
  next data 1 at an index 1 smaller than this index.

Recommended: Please solve it on “PRACTICE ” first, before moving on to the solution.

Following is implementation of counting sort.

C++

// C++ Program for counting sort 
#include <bits/stdc++.h> 
#include <string.h> 
using namespace std; 
#define RANGE 255 
  
// The main function that sort 
// the given string arr[] in 
// alphabatical order 
void countSort(char arr[]) 
{ 
    // The output character array 
    // that will have sorted arr 
    char output[strlen(arr)]; 
  
    // Create a count array to store count of inidividul 
    // characters and initialize count array as 0 
    int count[RANGE + 1], i; 
    memset(count, 0, sizeof(count)); 
  
    // Store count of each character 
    for (i = 0; arr[i]; ++i) 
        ++count[arr[i]]; 
  
    // Change count[i] so that count[i] now contains actual 
    // position of this character in output array 
    for (i = 1; i <= RANGE; ++i) 
        count[i] += count[i - 1]; 
  
    // Build the output character array 
    for (i = 0; arr[i]; ++i) { 
        output[count[arr[i]] - 1] = arr[i]; 
        --count[arr[i]]; 
    } 
  
    /*  
    For Stable algorithm  
    for (i = sizeof(arr)-1; i>=0; --i)  
    {  
        output[count[arr[i]]-1] = arr[i];  
        --count[arr[i]];  
    }  
      
    For Logic : See implementation  
    */
  
    // Copy the output array to arr, so that arr now 
    // contains sorted characters 
    for (i = 0; arr[i]; ++i) 
        arr[i] = output[i]; 
} 
  
// Driver  code 
int main() 
{ 
    char arr[] = "geeksforgeeks"; 
  
    countSort(arr); 
  
    cout << "Sorted character array is " << arr; 
    return 0; 
} 
  
// This code is contributed by rathbhupendra 

C

// C Program for counting sort 
#include <stdio.h> 
#include <string.h> 
#define RANGE 255 
  
// The main function that sort the given string arr[] in 
// alphabatical order 
void countSort(char arr[]) 
{ 
    // The output character array that will have sorted arr 
    char output[strlen(arr)]; 
  
    // Create a count array to store count of inidividul 
    // characters and initialize count array as 0 
    int count[RANGE + 1], i; 
    memset(count, 0, sizeof(count)); 
  
    // Store count of each character 
    for (i = 0; arr[i]; ++i) 
        ++count[arr[i]]; 
  
    // Change count[i] so that count[i] now contains actual 
    // position of this character in output array 
    for (i = 1; i <= RANGE; ++i) 
        count[i] += count[i - 1]; 
  
    // Build the output character array 
    for (i = 0; arr[i]; ++i) { 
        output[count[arr[i]] - 1] = arr[i]; 
        --count[arr[i]]; 
    } 
  
    /* 
     For Stable algorithm  
     for (i = sizeof(arr)-1; i>=0; --i) 
    { 
        output[count[arr[i]]-1] = arr[i]; 
        --count[arr[i]]; 
    } 
     
    For Logic : See implementation 
    */
  
    // Copy the output array to arr, so that arr now 
    // contains sorted characters 
    for (i = 0; arr[i]; ++i) 
        arr[i] = output[i]; 
} 
  
// Driver program to test above function 
int main() 
{ 
    char arr[] = "geeksforgeeks"; //"applepp"; 
  
    countSort(arr); 
  
    printf("Sorted character array is %sn", arr); 
    return 0; 
} 

Java

// Java implementation of Counting Sort 
class CountingSort { 
    void sort(char arr[]) 
    { 
        int n = arr.length; 
  
        // The output character array that will have sorted arr 
        char output[] = new char[n]; 
  
        // Create a count array to store count of inidividul 
        // characters and initialize count array as 0 
        int count[] = new int[256]; 
        for (int i = 0; i < 256; ++i) 
            count[i] = 0; 
  
        // store count of each character 
        for (int i = 0; i < n; ++i) 
            ++count[arr[i]]; 
  
        // Change count[i] so that count[i] now contains actual 
        // position of this character in output array 
        for (int i = 1; i <= 255; ++i) 
            count[i] += count[i - 1]; 
  
        // Build the output character array 
        // To make it stable we are operating in reverse order. 
        for (int i = n - 1; i >= 0; i--) { 
            output[count[arr[i]] - 1] = arr[i]; 
            --count[arr[i]]; 
        } 
  
        // Copy the output array to arr, so that arr now 
        // contains sorted characters 
        for (int i = 0; i < n; ++i) 
            arr[i] = output[i]; 
    } 
  
    // Driver method 
    public static void main(String args[]) 
    { 
        CountingSort ob = new CountingSort(); 
        char arr[] = { 'g', 'e', 'e', 'k', 's', 'f', 'o', 
                       'r', 'g', 'e', 'e', 'k', 's' }; 
  
        ob.sort(arr); 
  
        System.out.print("Sorted character array is "); 
        for (int i = 0; i < arr.length; ++i) 
            System.out.print(arr[i]); 
    } 
} 
/*This code is contributed by Rajat Mishra */

Python3

# Python program for counting sort 
  
# The main function that sort the given string arr[] in  
# alphabetical order 
def countSort(arr): 
  
    # The output character array that will have sorted arr 
    output = [0 for i in range(len(arr))] 
  
    # Create a count array to store count of inidividul 
    # characters and initialize count array as 0 
    count = [0 for i in range(256)] 
  
    # For storing the resulting answer since the  
    # string is immutable 
    ans = ["" for _ in arr] 
  
    # Store count of each character 
    for i in arr: 
        count[ord(i)] += 1
  
    # Change count[i] so that count[i] now contains actual 
    # position of this character in output array 
    for i in range(256): 
        count[i] += count[i-1] 
  
    # Build the output character array 
    for i in range(len(arr)): 
        output[count[ord(arr[i])]-1] = arr[i] 
        count[ord(arr[i])] -= 1
  
    # Copy the output array to arr, so that arr now 
    # contains sorted characters 
    for i in range(len(arr)): 
        ans[i] = output[i] 
    return ans  
  
# Driver program to test above function 
arr = "geeksforgeeks"
ans = countSort(arr) 
print("Sorted character array is % s" %("".join(ans))) 
  
# This code is contributed by Nikhil Kumar Singh 

C#

// C# implementation of Counting Sort 
using System; 
  
class GFG { 
  
    static void countsort(char[] arr) 
    { 
        int n = arr.Length; 
  
        // The output character array that 
        // will have sorted arr 
        char[] output = new char[n]; 
  
        // Create a count array to store 
        // count of inidividul characters 
        // and initialize count array as 0 
        int[] count = new int[256]; 
  
        for (int i = 0; i < 256; ++i) 
            count[i] = 0; 
  
        // store count of each character 
        for (int i = 0; i < n; ++i) 
            ++count[arr[i]]; 
  
        // Change count[i] so that count[i] 
        // now contains actual position of 
        // this character in output array 
        for (int i = 1; i <= 255; ++i) 
            count[i] += count[i - 1]; 
  
        // Build the output character array 
        // To make it stable we are operating in reverse order. 
        for (int i = n - 1; i >= 0; i--) { 
            output[count[arr[i]] - 1] = arr[i]; 
            --count[arr[i]]; 
        } 
  
        // Copy the output array to arr, so 
        // that arr now contains sorted 
        // characters 
        for (int i = 0; i < n; ++i) 
            arr[i] = output[i]; 
    } 
  
    // Driver method 
    public static void Main() 
    { 
  
        char[] arr = { 'g', 'e', 'e', 'k', 's', 'f', 'o', 
                       'r', 'g', 'e', 'e', 'k', 's' }; 
  
        countsort(arr); 
  
        Console.Write("Sorted character array is "); 
        for (int i = 0; i < arr.Length; ++i) 
            Console.Write(arr[i]); 
    } 
} 
  
// This code is contributed by Sam007. 

PHP

<?php 
// PHP Program for counting sort 
  
$RANGE = 255; 
  
// The main function that sort  
// the given string arr[] in 
// alphabatical order 
function countSort($arr) 
{ 
    global $RANGE; 
      
    // The output character array  
    // that will have sorted arr 
    $output = array(strlen($arr)); 
    $len = strlen($arr); 
      
    // Create a count array to  
    // store count of inidividul  
    // characters and initialize 
    // count array as 0 
    $count = array_fill(0, $RANGE + 1, 0); 
  
    // Store count of  
    // each character 
    for($i = 0; $i < $len; ++$i) 
        ++$count[ord($arr[$i])]; 
  
    // Change count[i] so that  
    // count[i] now contains  
    // actual position of this 
    // character in output array 
    for ($i = 1; $i <= $RANGE; ++$i) 
        $count[$i] += $count[$i - 1]; 
  
    // Build the output 
    // character array 
    // To make it stable we are operating  
    // in reverse order. 
    for ($i = $len-1; $i >= 0 ; $i--) 
    { 
        $output[$count[ord($arr[$i])] - 1] = $arr[$i]; 
        --$count[ord($arr[$i])]; 
    } 
  
    // Copy the output array to  
    // arr, so that arr now  
    // contains sorted characters 
    for ($i = 0; $i < $len; ++$i) 
        $arr[$i] = $output[$i]; 
return $arr; 
} 
  
// Driver Code 
$arr = "geeksforgeeks"; //"applepp"; 
  
$arr = countSort($arr); 
  
echo "Sorted character array is " . $arr; 
  
// This code is contributed by mits 
?> 

Output:

Sorted character array is eeeefggkkorss

Time Complexity: O(n+k) where n is the number of elements in input array and k is the range of input.
Auxiliary Space: O(n+k)

The problem with the previous counting sort was that we could not sort the elements if we have negative numbers in it. Because there are no negative array indices. So what we do is, we find the minimum element and we will store count of that minimum element at zero index.

C++

// Counting sort which takes negative numbers as well 
#include <algorithm> 
#include <iostream> 
#include <vector> 
using namespace std; 
  
void countSort(vector<int>& arr) 
{ 
    int max = *max_element(arr.begin(), arr.end()); 
    int min = *min_element(arr.begin(), arr.end()); 
    int range = max - min + 1; 
  
    vector<int> count(range), output(arr.size()); 
    for (int i = 0; i < arr.size(); i++) 
        count[arr[i] - min]++; 
  
    for (int i = 1; i < count.size(); i++) 
        count[i] += count[i - 1]; 
  
    for (int i = arr.size() - 1; i >= 0; i--) { 
        output[count[arr[i] - min] - 1] = arr[i]; 
        count[arr[i] - min]--; 
    } 
  
    for (int i = 0; i < arr.size(); i++) 
        arr[i] = output[i]; 
} 
  
void printArray(vector<int>& arr) 
{ 
    for (int i = 0; i < arr.size(); i++) 
        cout << arr[i] << " "; 
    cout << "\n"; 
} 
  
int main() 
{ 
    vector<int> arr = { -5, -10, 0, -3, 8, 5, -1, 10 }; 
    countSort(arr); 
    printArray(arr); 
    return 0; 
} 

Java

// Counting sort which takes negative numbers as well 
import java.util.*; 
  
class GFG { 
  
    static void countSort(int[] arr) 
    { 
        int max = Arrays.stream(arr).max().getAsInt(); 
        int min = Arrays.stream(arr).min().getAsInt(); 
        int range = max - min + 1; 
        int count[] = new int[range]; 
        int output[] = new int[arr.length]; 
        for (int i = 0; i < arr.length; i++) { 
            count[arr[i] - min]++; 
        } 
  
        for (int i = 1; i < count.length; i++) { 
            count[i] += count[i - 1]; 
        } 
  
        for (int i = arr.length - 1; i >= 0; i--) { 
            output[count[arr[i] - min] - 1] = arr[i]; 
            count[arr[i] - min]--; 
        } 
  
        for (int i = 0; i < arr.length; i++) { 
            arr[i] = output[i]; 
        } 
    } 
  
    static void printArray(int[] arr) 
    { 
        for (int i = 0; i < arr.length; i++) { 
            System.out.print(arr[i] + " "); 
        } 
        System.out.println(""); 
    } 
  
    // Driver code 
    public static void main(String[] args) 
    { 
        int[] arr = { -5, -10, 0, -3, 8, 5, -1, 10 }; 
        countSort(arr); 
        printArray(arr); 
    } 
} 
  
// This code is contributed by princiRaj1992 

Python3

# Python program for counting sort  
# which takes negative numbers as well 
  
# The function that sorts the given arr[] 
def count_sort(arr): 
    max_element = int(max(arr)) 
    min_element = int(min(arr)) 
    range_of_elements = max_element - min_element + 1
    # Create a count array to store count of individual 
    # elements and initialize count array as 0 
    count_arr = [0 for _ in range(range_of_elements)] 
    output_arr = [0 for _ in range(len(arr))] 
  
    # Store count of each character 
    for i in range(0, len(arr)): 
        count_arr[arr[i]-min_element] += 1
  
    # Change count_arr[i] so that count_arr[i] now contains actual 
    # position of this element in output array 
    for i in range(1, len(count_arr)): 
        count_arr[i] += count_arr[i-1] 
  
    # Build the output character array 
    for i in range(len(arr)-1, -1, -1): 
        output_arr[count_arr[arr[i] - min_element] - 1] = arr[i] 
        count_arr[arr[i] - min_element] -= 1
  
    # Copy the output array to arr, so that arr now 
    # contains sorted characters 
    for i in range(0, len(arr)): 
        arr[i] = output_arr[i] 
  
    return arr 
  
  
# Driver program to test above function 
arr = [-5, -10, 0, -3, 8, 5, -1, 10] 
ans = count_sort(arr) 
print("Sorted character array is " + str(ans)) 

Output:

-10 -5 -3 -1 0 5 8 10

Points to be noted:
1. Counting sort is efficient if the range of input data is not significantly greater than the number of objects to be sorted. Consider the situation where the input sequence is between range 1 to 10K and the data is 10, 5, 10K, 5K.
2. It is not a comparison based sorting. It running time complexity is O(n) with space proportional to the range of data.
3. It is often used as a sub-routine to another sorting algorithm like radix sort.
4. Counting sort uses a partial hashing to count the occurrence of the data object in O(1).
5. Counting sort can be extended to work for negative inputs also.
Exercise:
1. Modify above code to sort the input data in the range from M to N.
2. Is counting sort stable and online?
3. Thoughts on parallelizing the counting sort algorithm.

Snapshots:

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Quiz on Counting Sort

Coding Practice for Sorting

Other Sorting Algorithms on GeeksforGeeks/GeeksQuiz
Selection Sort, Bubble Sort, Insertion Sort, Merge Sort, Heap Sort, QuickSort, Radix Sort, Counting Sort, Bucket Sort, ShellSort, Comb Sort, PegionHole Sorting
This article is compiled by Aashish Barnwal. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

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