diff --git a/RadixSort.java b/RadixSort.java new file mode 100644 index 0000000..7c885fa --- /dev/null +++ b/RadixSort.java @@ -0,0 +1,80 @@ +// Radix sort Java implementation + +import java.io.*; +import java.util.*; + +class Radix { + + // A utility function to get maximum value in arr[] + static int getMax(int arr[], int n) + { + 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. + static void countSort(int arr[], int n, int exp) + { + int output[] = new int[n]; // output array + int i; + int count[] = new int[10]; + Arrays.fill(count, 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 + static void radixsort(int arr[], int n) + { + // Find the maximum number to know number of digits + int m = getMax(arr, n); + + // 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 + static void print(int arr[], int n) + { + for (int i = 0; i < n; i++) + System.out.print(arr[i] + " "); + } + + // Main driver method + public static void main(String[] args) + { + int arr[] = { 170, 45, 75, 90, 802, 24, 2, 66 }; + int n = arr.length; + + // Function Call + radixsort(arr, n); + print(arr, n); + } +} \ No newline at end of file