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class IsLoop{
Node first,last,t;
static class Node{
int data;
Node next;
Node(int d){
data = d;
next = null;
}
}
void create(int a[], int n){
first = new Node(a[0]);
last = first;
for(int i=1;i<n;i++){
t = new Node(a[i]);
last.next = t;
last = t;
}
}
boolean isLoop(Node f){
Node p=f,q=f;
do{
p = p.next;
q = q.next;
if(q!=null){
q = q.next;
}
else{
q = null;
}
}while(p!=null && q!=null && p!=q);
if(p==q){
return true;
}
else{
return false;
}
}
public static void main(String[] args){
IsLoop l = new IsLoop();
int a[] = {1,2,3,4,5};
int n = a.length;
l.create(a,n);
l.first.next = l.first;
System.out.println(l.isLoop(l.first));
}
}
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