How will u find whether a linked list has a loop or not?

Answer Posted / 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;
}

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