Answer / sivaraj

BOOL findloop(struct node *start)
{
struct node *ptr,*ptr1;
ptr=start;
ptr1= start->next;
while(ptr!=NULL && ptr->next!=null && ptr1->next!=null &&
ptr1->next->next!=null)
{
if(ptr==ptr1)
return FALSE;
ptr=ptr->next;
ptr1=ptr1->next->next;
}
return TRUE;
}

Answer / sanyam

the approach is to mark the nodes starting from the head.and
follow the links.
in the process if you find a node already marked then there
is loop.

Answer / adi

answer 2 is correct

Answer / priya

same logic as 3rd answer..

typedef struct node
{ int data,mark; /*mark is all initialised to 0*/
node *next;
}node;

node* findloop(node* start)
{
node *p=start;
while(p)
{
if(p->mark==0)
{
p->mark=1;
p=p->next;
}
else
{
return p;
}
}
return p;
}

Answer / karthik

I guess the return shud b TRUE in the if(ptr==ptr1) block
since that's the oly condition for presence of a loop in the
LL.. and return shud b a false after d while loop!!!

Answer / zameer arif

You are right. In the loop, return should be true. outside
the loop, false.

Answer / anurag srivastava

void lopp( node **start)
{
node *temp,*newnode;
temp=*start;
while(*temp && !(temp->next==start))
{ temp=temp->next; }
if(!(*temp)) printf("Non loop");
else printf("Loop");
}

Answer / s.v.prasad reddy

findloop(struct node *start)
{
struct node *ptr,*ptr1;
start=ptr;

while(ptr!=NULL)
{
ptr1=ptr->next;

while(ptr1!=NULL)
{
if(ptr1->link==ptr->link)
{
printf("\nLoop found at %d node",ptr->data);
exit(0);
}
ptr1=ptr1->link;
}
ptr=ptr->link;
}
printf("\nNo Loop found in list");
}

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1 Answers