Updated radix-sort.cs

algorithms/CSharp/src/Sorts/radix-sort.cs

@@ -1,81 +1,53 @@
 using System;
+using System.Collections.Generic;
+using System.Text;
 
-class myProgram {
-	public static int getMax(int[] arr, int n)
+namespace Algorithms.Sorts
 {
-		int mx = arr[0];
-		for (int i = 1; i < n; i++)
-			if (arr[i] > mx)
-				mx = arr[i];
-		return mx;
-	}
-
-	// A function to do counting sort of arr[] according to
-	// the digit represented by exp.
-	public static void countSort(int[] arr, int n, int exp)
+    public class RadixSort
     {
-		int[] output = new int[n]; // output array
-		int i;
-		int[] count = new int[10];
-
-		// initializing all elements of count to 0
-		for (i = 0; i < 10; i++)
-			count[i] = 0;
-
-		// Store count of occurrences in count[]
-		for (i = 0; i < n; i++)
-			count[(arr[i] / exp) % 10]++;
-
-		// Change count[i] so that count[i] now contains
-		// actual
-		// position of this digit in output[]
-		for (i = 1; i < 10; i++)
-			count[i] += count[i - 1];
-
-		// Build the output array
-		for (i = n - 1; i >= 0; i--) {
-			output[count[(arr[i] / exp) % 10] - 1] = arr[i];
-			count[(arr[i] / exp) % 10]--;
-		}
-
-		// Copy the output array to arr[], so that arr[] now
-		// contains sorted numbers according to current
-		// digit
-		for (i = 0; i < n; i++)
-			arr[i] = output[i];
-	}
-
-	// The main function to that sorts arr[] of size n using
-	// Radix Sort
-	public static void radixsort(int[] arr, int n)
+        public static List<int> Sort(List<int> numbers)
         {
-		// Find the maximum number to know number of digits
-		int m = getMax(arr, n);
+            int max = numbers.Max();
 
-		// Do counting sort for every digit. Note that
-		// instead of passing digit number, exp is passed.
-		// exp is 10^i where i is current digit number
-		for (int exp = 1; m / exp > 0; exp *= 10)
-			countSort(arr, n, exp);
-	}
-
-	// A utility function to print an array
-	public static void print(int[] arr, int n)
+            for (int exp = 1; max / exp > 0; exp *= 10)
             {
-		for (int i = 0; i < n; i++)
-			Console.Write(arr[i] + " ");
+                numbers = CountingSort(numbers, exp);
+            }
+
+            return numbers;
+        }
+
+        public static List<int> CountingSort(List<int> numbers, int exp)
+        {
+            int[] counts = new int[10];
+            List<int> result = new List<int>(new int[numbers.Count]);
+
+            for (int i = 0; i < numbers.Count; i++)
+            {
+                counts[(numbers[i] / exp) % 10]++;
+            }
+
+            for (int i = 1; i < counts.Length; i++)
+            {
+                counts[i] += counts[i - 1];
+            }
+
+            for (int i = numbers.Count - 1; i >= 0; i--)
+            {
+                result[counts[(numbers[i] / exp) % 10] - 1] = numbers[i];
+                counts[(numbers[i] / exp) % 10]--;
+            }
+
+            return result;
         }
 
-	// Driver Code
         public static void Main()
         {
-		int[] arr = { 170, 45, 75, 90, 802, 24, 2, 66 };
-		int n = arr.Length;
+            List<int> numbers = new List<int> { 100, 10, 1, 1000, 10000 };
+            List<int> sortedNumbers = Sort(numbers);
 
-		// Function Call
-		radixsort(arr, n);
-		print(arr, n);
+            Console.WriteLine(string.Join(", ", sortedNumbers)); // 1, 10, 100, 1000, 10000
+        }
     }
-
-	
 }