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7.QuickSort.cpp

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+/*
+ * This program takes an array from the user
+ * sorts it using quicksort
+ * Prints the sorted array
+ * For more information about Quicksort Algorithm: https://en.wikipedia.org/wiki/Quicksort
+ *
+ *      Coded by: Abdurrezak EFE
+ *
+ * */
+#include <iostream>
+#include <algorithm>
+using namespace std;
+
+int partition(int arr[], int l, int r) // The used partition method is Lomuto's Partition
+{
+    int pivot = arr[r]; //choosing the last element as the pivot
+
+    int i = (l - 1); //starting from the left
+    int temp;
+
+    for (int j = l; j <= r- 1; j++)
+    {
+        if (arr[j] <= pivot)
+        {
+            i++;
+            temp = arr[i];
+            arr[i] = arr[j],arr[j]=temp; //swapping elements
+        }
+    }
+    temp = arr[i+1], arr[i+1] = arr[r], arr[r] = temp; //swapping elements again
+    return (i + 1);
+}
+
+void quick_sort(int arr[], int l, int r)
+{
+    if (l < r)
+    {
+        int p = partition(arr, l, r);
+        quick_sort(arr, l, p - 1);
+        quick_sort(arr, p + 1, r);
+    }
+}
+
+int main()
+{
+    int k;
+    cout << "Enter the number of the integers you want to construct the array from: ";
+    cin >> k;
+
+    int arr[k];
+    for(int i=0;i<k;i++)
+        cin >> arr[i];
+
+    quick_sort(arr,0, k-1); //sorting
+
+    for(int i=0;i<k;i++) //printing the array
+        cout << arr[i] << " ";
+}