radix-sort.cpp

//Author: Tawfik Yasser
#include <iostream>
#include<algorithm>
using namespace std;
int getMax(int array[], int n) {
  int max = array[0];
  for (int i = 1; i < n; i++)
    if (array[i] > max)
      max = array[i];
  return max;
}
void countingSort(int array[], int size, int place) {
  const int max = 10;
  int output[size];
  int count[max];

  for (int i = 0; i < max; ++i)
    count[i] = 0;

  for (int i = 0; i < size; i++)
    count[(array[i] / place) % 10]++;

  for (int i = 1; i < max; i++)
    count[i] += count[i - 1];

  for (int i = size - 1; i >= 0; i--) {
    output[count[(array[i] / place) % 10] - 1] = array[i];
    count[(array[i] / place) % 10]--;
  }

  for (int i = 0; i < size; i++)
    array[i] = output[i];
}

void radixSort(int array[], int size) {
  int max = getMax(array, size);
  for (int place = 1; max / place > 0; place *= 10)
    countingSort(array, size, place);
}

//Print the sorted array
void printSortedArray(int arr[],int n){
    for(int i=0;i<n;i++){
        cout<<arr[i]<<endl;
    }
}
int main()
{
    int arr[] = {432,8,530,90,88,231,11,45,677,199};  // Unsorted Array
    int arr_size = sizeof(arr) / sizeof(arr[0]);      // Getting array size
    radixSort(arr,arr_size);                          // Send the array to radixSort
    printSortedArray(arr,arr_size);                   // Print the sorted array
    return 0;
}