C++ Programming Code Examples
C++ > Data Structures Code Examples
C++ Program to Implement Skew Heap
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/* C++ Program to Implement Skew Heap
This C++ Program demonstrates the implementation of Skew Heap. */
#include <iostream>
#include <cstdlib>
using namespace std;
/* Skew Heap Class */
class Skew_Heap
{
public:
int key;
Skew_Heap *right;
Skew_Heap *left;
Skew_Heap *parent;
/* Constructor */
Skew_Heap()
{
key = 0;
right = NULL;
left = NULL;
parent = NULL;
}
/* Merging Skew Heaps */
Skew_Heap *merge(Skew_Heap *h1, Skew_Heap *h2)
{
Skew_Heap *temp;
if (h1 == NULL)
return h2;
else if (h2 == NULL)
return h1;
else
{
if (h1->key < h2->key)
{
temp = h1;
h1 = h2;
h2 = temp;
}
temp = h1->left;
h1->left = h1->right;
h1->right = temp;
h1->left = merge(h2, h1->left);
}
return h1;
}
/* Construct Skew Heap */
Skew_Heap *construct(Skew_Heap *root)
{
Skew_Heap *temp;
int input, val;
while (1)
{
cout<<"Enter the value of the node(0 to exit): ";
cin >> val;
if (val == 0)
break;
temp = new Skew_Heap;
temp->key = val;
root = merge(root, temp);
}
return root;
}
/* Insert into Skew Heap */
Skew_Heap *insert(Skew_Heap *root)
{
int val;
Skew_Heap *temp;
cout<<"Enter the value of the node: ";
cin >> val;
temp = new Skew_Heap;
temp->key = val;
root = merge(root, temp);
return root;
}
/* Delete Maximum from Skew Heap */
Skew_Heap *delete_max(Skew_Heap *root)
{
if (root == NULL)
{
cout << "The heap is empty"<<endl;
return NULL;
}
Skew_Heap *temp1, *temp2;
temp1 = root->left;
temp2 = root->right;
temp1 = merge(temp1, temp2);
cout << "Maximum Deleted "<<endl;
return temp1;
}
/* Preorder Traversal of Skew Heap */
void preorder(Skew_Heap *root)
{
if (root == NULL)
return;
else
{
cout << root->key <<" ";
preorder(root->left);
preorder(root->right);
}
return;
}
/* Inorder Traversal of Skew Heap */
void inorder(Skew_Heap *root)
{
if (root == NULL)
return;
else
{
inorder(root->left);
cout << root->key <<" ";
inorder(root->right);
}
return;
}
/* Postorder Traversal of Skew Heap */
void postorder(Skew_Heap *root)
{
if (root == NULL)
return;
else
{
postorder(root->left);
postorder(root->right);
cout << root->key <<" ";
}
return;
}
/* Display Skew Heap */
void print_heap(Skew_Heap *root)
{
cout << "Preorder traversal of the heap is " << endl;
preorder(root);
cout << endl;
cout << "Inorder traversal of the heap is " << endl;
inorder(root);
cout << endl;
cout << "Postorder traversal of the heap is " << endl;
postorder(root);
cout << endl;
}
};
/* Main Contains Menu */
int main()
{
Skew_Heap *head1, *temp1, *temp2, obj, *temp3;
int input;
head1 = NULL;
temp1 = NULL;
temp2 = NULL;
temp3 = NULL;
while(1)
{
cout << endl<< "-----------Operations on Skew Heap---------"<<endl;
cout << "1.Insert element into the heap"<<endl;
cout << "2.Delete maximum element from the heap"<<endl;
cout << "3.Merge two heaps"<<endl;
cout << "4.Print the heap"<<endl;
cout << "5.Print the maximum element of the heap"<<endl;
cout << "6.Merge the present heap with another heap"<<endl;
cout << "7.Exit"<<endl;
cout << "Enter your Choice: ";
cin >> input;
switch(input)
{
case 1:
head1 = obj.insert(head1);
break;
case 2:
head1 = obj.delete_max(head1);
break;
case 3:
cout << "Enter the first heap: "<<endl;
temp1 = obj.construct(temp1);
cout << "Enter the second heap: "<<endl;
temp2 = obj.construct(temp2);
temp1 = obj.merge(temp1, temp2);
cout << "The heap obtained after merging is: "<<endl;
obj.print_heap(temp1);
break;
case 4:
obj.print_heap(head1);
break;
case 5:
cout << "The maximum element existing in the heap is: ";
cout << head1->key << endl;
break;
case 6:
cout << "Enter the second heap"<<endl;
temp3 = obj.construct(temp3);
temp3 = obj.merge(temp3, head1);
cout << "The heap obtained after merging is: "<<endl;
obj.print_heap(temp3);
break;
case 7:
exit(1);
default:
cout<<"Enter Correct Choice"<<endl;
break;
}
}
return 0;
}
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