From cc5da8777a1abc8b8bfa737ca08c31f288d264a6 Mon Sep 17 00:00:00 2001
From: Tawfik Yasser <tawfekyassertawfek@gmail.com>
Date: Sun, 7 Feb 2021 19:43:09 +0200
Subject: [PATCH] Add Radix Sort (#58)

* Add radix-sort algorithm

* Update README.md

* Update radix-sort.cpp

Update code to accept all test cases

* Update radix-sort.cpp

fixing function name

Co-authored-by: Arsenic <54987647+Arsenic-ATG@users.noreply.github.com>
---
 sorting/README.md               |  4 +--
 sorting/c-or-cpp/radix-sort.cpp | 54 +++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+), 2 deletions(-)
 create mode 100644 sorting/c-or-cpp/radix-sort.cpp

diff --git a/sorting/README.md b/sorting/README.md
index 56c50cdd..0372fce9 100644
--- a/sorting/README.md
+++ b/sorting/README.md
@@ -10,8 +10,8 @@
 6. [Heap Sort](c-or-cpp/heap-sort.cpp)
 7. [Counting Sort](c-or-cpp/counting-sort.cpp)
 8. [Bucket Sort](c-or-cpp/bucket-sort.cpp)
-9. [Shell Sort](c-or-cpp/shell-sort.cpp)
-
+9. [Radix Sort](c-or-cpp/radix-sort.cpp)
+10. [Shell Sort](c-or-cpp/shell-sort.cpp)
 
 
 ### C#
diff --git a/sorting/c-or-cpp/radix-sort.cpp b/sorting/c-or-cpp/radix-sort.cpp
new file mode 100644
index 00000000..46784a14
--- /dev/null
+++ b/sorting/c-or-cpp/radix-sort.cpp
@@ -0,0 +1,54 @@
+//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;
+}