Added Radix Sort

02. Algorithms/01. Arrays/03. Sorting/06. RadixSort/RadixSort.java

@@ -0,0 +1,86 @@
+
+import java.util.ArrayList;
+
+public class RadixSort {
+
+	public static void sort(int arr[],int div) //function to store based on their digit
+	{
+		ArrayList<ArrayList<Integer>> array = new ArrayList<ArrayList<Integer>>(); // array contains list which has elemnets according to their digit
+		for(int i=0;i<10;i++) //size of array taken as 10 i.e. 0 to 9
+		{
+			ArrayList<Integer> tempList = new ArrayList<Integer>();
+			array.add(tempList);
+		}
+		for(int i=0;i<arr.length;i++)
+		{
+			if(array.get((arr[i]/div)%10).size()==0) // if size of list at desired index of array is zero then create new list
+			{
+
+				ArrayList<Integer> tempList =new ArrayList<Integer>();
+				tempList.add(arr[i]);
+				array.add((arr[i]/div)%10, tempList);
+			}
+			else // if size of list at desired index of array is not zero then remove old list put new list at that index
+			{
+				ArrayList<Integer> tempList =new ArrayList<Integer>();
+				tempList = array.get((arr[i]/div)%10);
+				array.remove((arr[i]/div)%10);
+				tempList.add(arr[i]);
+				array.add((arr[i]/div)%10, tempList);
+			}
+		}
+
+		int k=0; //put sorted values in the original array
+		for(int i=0;i<array.size();i++)
+		{
+			if(array.get(i).size()!=0)
+			{
+				for(int j=0;j<array.get(i).size();j++)
+				{
+					arr[k] = array.get(i).get(j);
+					k++;
+				}
+			}
+		}
+	}
+
+	public static void radixSort(int arr[],int max)
+	{
+		for(int div=1;(max/div)>0;div=div*10) //loop runs as equal number of times as there are total number of digits in maximum integer
+		{
+			sort(arr,div);
+		}
+	}
+
+
+	public static int max(int arr[]) //maximum number is found to calculate how many times loop will run 
+	{
+		int max = arr[0];
+		for(int i=1;i<arr.length;i++)
+		{
+			if(arr[i]>max)
+			{
+				max=arr[i];
+			}
+		}
+		return max;
+	}
+
+	public static void print(int arr[]) //function to print final sorted array
+	{
+		for(int i=0;i<arr.length;i++)
+		{
+			System.out.print(arr[i]+" ");
+		}
+	}
+
+	public static void main(String[] args)
+	{
+		int arr[] = {170,45,75,90,802,24,2,66};
+		int max = max(arr);
+		radixSort(arr,max);
+		print(arr);
+	}
+
+}
+