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P35.java
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P35.java
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/****************************************************************
*
* Following is the class structure of the Node class:
*
* class Node {
* public int data;
* public Node next;
*
* Node()
* {
* this.data = 0;
* this.next = null;
* }
* Node(int data)
* {
* this.data = data;
* this.next = null;
* }
* Node(int data, Node next)
* {
* this.data = data;
* this.next = next;
* }
* }
*
*****************************************************************/
public class P35 {
public static Node firstNode(Node head) {
Node s = head;
Node f = head;
while (f != null && f.next != null) {
s = s.next;
f = f.next.next;
if (s == f)
break;
}
if (f == null || f.next == null)
return null;
Node temp = head;
while (temp != s) {
temp = temp.next;
s = s.next;
}
return s;
}
}