Quick Sort

Quick Sort.cpp

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+/* C implementation QuickSort */
+#include<iostream>
+using namespace std;
+ 
+int partition (int arr[], int low, int high)
+{
+    int pivot = arr[high];    // pivot
+    int i = (low - 1);  // Index of smaller element
+ 
+    for (int j = low; j <high; j++)
+    {
+        // If current element is smaller than or
+        // equal to pivot
+        if (arr[j] <= pivot)
+        {
+            i++;    // increment index of smaller element
+            int temp=arr[i];
+            arr[i]=arr[j];
+            arr[j]=temp;
+        }
+    }
+    int temp=arr[i+1];
+    arr[i+1]=arr[high];
+    arr[high]=temp;
+    return (i + 1);
+}
+ 
+
+void quickSort(int arr[], int low, int high)
+{
+    if (low < high)
+    {
+       
+        int p= partition(arr, low, high);
+
+        quickSort(arr, low, p - 1);
+        quickSort(arr, p + 1, high);
+    }
+}
+ 
+
+void show(int arr[], int size)
+{
+    for (int i=0; i < size; i++)
+    cout<<arr[i]<<"\n";
+}
+ 
+// Driver program to test above functions
+int main()
+{
+    int size;
+    cout<<"\nEnter the number of elements : ";
+
+    cin>>size;
+
+    int arr[size];
+    
+    cout<<"\nEnter the unsorted elements : ";
+
+    for (int i = 0; i < size; ++i)
+    {
+        cout<<"\n";
+        cin>>arr[i];
+    }
+    quickSort(arr, 0, size);
+    cout<<"Sorted array\n";
+    show(arr, size);
+    return 0;
+}