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floyds_cycle.cpp
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floyds_cycle.cpp
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#include<iostream>
using namespace std;
class node
{
public:
int data;
node *next;
node(int val)
{
data = val;
next = NULL;
}
};
void adds(node *&head, int val)
{
node *n = new node(val);
if (head == NULL)
{
head = n;
}
node *temp = head;
n->next = head;
head = n;
}
void addend(node *&head, int val)
{
node *n = new node(val);
if (head == NULL)
{
head = n;
return;
}
node *temp = head;
while (temp->next != NULL)
{
temp = temp->next;
}
temp->next = n;
}
void display(node *head)
{
node *temp = head;
while (temp != NULL)
{
cout << temp->data << "->";
temp = temp->next;
}
cout << "NULL" << endl;
}
// function for creating cycle
void cycle(node* &head , int p){
node* temp = head;
node* joint ;
int count = 1 ;
while (temp->next!=NULL)
{
if (count==p)
{
joint = temp ;
}
temp= temp->next ;
count++;
}
temp->next = joint ;
}
// function for detecting cycle
bool detectcy(node* &head ){
node* fast = head ;
node* slow = head ;
while (fast!=NULL && fast->next != NULL)
{
fast = fast->next->next;
slow = slow->next ;
if (fast == slow)
{
return true ;
}
}
return false ;
}
// for removing cycle
void removecy(node* &head ){
node* fast = head ;
node* slow = head ;
do
{
fast = fast->next->next;
slow = slow->next;
} while (fast!=slow);
fast = head ;
while (fast->next != slow->next)
{
fast = fast->next ;
slow = slow->next ;
}
slow->next = NULL ;
}
int main( )
{
node *head = NULL;
addend(head, 1);
addend(head, 2);
addend(head, 3);
addend(head, 4);
addend(head, 5);
addend(head, 6);
adds(head, 0);
display(head);
cycle(head , 4);
cout<< detectcy(head) ;
removecy(head);
cout<< detectcy(head) ;
display(head);
return 0 ;
}