COUNTING_SORT.java

import java.util.*;

public class COUNTING_SORT {
    public static void countingSort(int[] arr) {
        int max = arr[0];
        for (int i = 1; i < arr.length; i++) {
            if (arr[i] > max) {
                max = arr[i];
            }
        }
        int[] count = new int[max + 1];
        for (int i = 0; i < arr.length; i++) {
            count[arr[i]]++;
        }
        for (int i = 1; i <= max; i++) {
            count[i] += count[i - 1];
        }
        int[] sorted = new int[arr.length];
        for (int i = arr.length - 1; i >= 0; i--) {
            sorted[count[arr[i]] - 1] = arr[i];
            count[arr[i]]--;
        }
        for (int i = 0; i < arr.length; i++) {
            arr[i] = sorted[i];
        }
    }

    public static void main(String args[]) {
        int arr[] = { 5, 4, 1, 3, 2 };
        countingSort(arr);
        Printarray(arr);

    }
}