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9.CountingSort.cpp

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+/*
+ * This program takes an array from the user
+ * sorts it using counting sort
+ * Prints the sorted array
+ * For more information about Counting Sort Algorithm: https://en.wikipedia.org/wiki/Counting_sort
+ *
+ *      Coded by: Abdurrezak EFE
+ *
+ * */
+#include <iostream>
+#include <algorithm>
+using namespace std;
+
+void counting_sort(int arr[], int k, int maxx)
+{
+    int counts[maxx+1];
+    for(int i=0;i<maxx+1;i++) //initializing count array
+        counts[i] = 0;
+
+    for(int i=0; i<k; i++) //we find out how many times a character occurs
+        counts[arr[i]]++;
+
+    for(int i=1;i<=maxx; i++) //we find out the actual positions of the elements
+        counts[i] += counts[i-1];
+
+    //we copy our array
+    int arr2[k];
+    for(int i=0;i<k;i++)
+        arr2[i] = arr[i];
+
+    for(int i=0; i<k; i++) //change the order of the original array
+        arr[counts[arr2[i]]-1] = arr2[i], counts[arr2[i]]--;
+}
+
+int main()
+{
+    int k;
+    cout << "Enter the number of the integers you want to construct the array from: ";
+    cin >> k;
+
+    int arr[k];
+    int maxx = -1;
+    for(int i=0;i<k;i++)
+        cin >> arr[i], maxx = max(maxx,arr[i]);
+
+    counting_sort(arr, k, maxx); //sorting
+
+    for(int i=0;i<k;i++) //printing the array
+        cout << arr[i] << " ";
+}