Added Cocktail Selection Sort

Cocktail Selection Sort is a Sorting algorithm which chooses the minimum and maximum element in an array simultaneously, and swaps it with the lowest and highest available position iteratively or recursively

Sorting/CocktailSelectionSort.cpp

@@ -0,0 +1,116 @@
+//Returns Sorted elements after performing Cocktail Selection Sort
+//It is a Sorting algorithm which chooses the minimum and maximum element in an array simultaneously, 
+//and swaps it with the lowest and highest available position iteratively or recursively
+
+
+#include<iostream>
+using namespace std;
+
+//Iterative Version
+
+void CocktailSelectionSort(vector <int> &vec,int low,int high)
+{
+  while(low<=high)
+  {
+  int minimum=vec[low];
+  int minimumindex=low;
+  int maximum=vec[high];
+  int maximumindex=high;
+
+  for(int i=low;i<=high;i++)
+  {
+    if(vec[i]>=maximum)
+    {
+      maximum=vec[i];
+      maximumindex=i;
+    }
+    if(vec[i]<=minimum)
+    {
+      minimum=vec[i];
+      minimumindex=i;
+    }
+  }
+  if(low!=maximumindex||high!=minimumindex)
+  {
+  swap(vec[low],vec[minimumindex]);
+  swap(vec[high],vec[maximumindex]);
+  }
+  else
+  {
+    swap(vec[low],vec[high]);
+  }
+ 
+  low++;
+  high--;
+}
+    
+}
+
+
+//Recursive Version
+
+void CocktailSelectionSort(vector <int> &vec,int low,int high)
+{
+  
+  if(low>=high)
+  	return;
+  
+  int minimum=vec[low];
+  int minimumindex=low;
+  int maximum=vec[high];
+  int maximumindex=high;
+
+  for(int i=low;i<=high;i++)
+  {
+    if(vec[i]>=maximum)
+    {
+      maximum=vec[i];
+      maximumindex=i;
+    }
+    if(vec[i]<=minimum)
+    {
+      minimum=vec[i];
+      minimumindex=i;
+    }
+  }
+  if(low!=maximumindex||high!=minimumindex)
+  {
+  swap(vec[low],vec[minimumindex]);
+  swap(vec[high],vec[maximumindex]);
+  }
+  else
+  {
+    swap(vec[low],vec[high]);
+  }
+ 	
+  CocktailSelectionSort(vec,low+1,high-1);
+
+    
+}
+
+
+//main function, select any one of iterative or recursive version
+
+int main()
+{
+
+    int n;
+    cout << "Enter number of elements\n";
+    cin >> n;
+    std::vector<int> v(n);
+    cout << "Enter all the elements\n";
+    for (int i = 0; i < n; ++i)
+    {
+      cin >> v[i];
+    }
+
+    CocktailSelectionSort(v,0,n-1);
+    cout << "Sorted elements are\n";
+    for (int i = 0; i < n; ++i)
+    {
+        cout << v[i] << " ";
+    }
+
+  
+  return 0;
+}