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Added and Implemented Counting sort with Java. #96. #155

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Oct 25, 2017
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Added and Implemented Counting sort with Java. #96. #155

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47 changes: 47 additions & 0 deletions Sorts/CountSort.java
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Original file line number Diff line number Diff line change
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public class CountingSort
{
public static 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
for (int i = 0; i < n; ++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];
}

public static void main(String args[])
{
char arr[] = {'h','a','c','k','t','o','b','e','r','f','e','s','t'};

sort(arr);
System.out.print("Sorted character array is ");
for (int i=0; i<arr.length; ++i)
System.out.print(arr[i]);
}
}