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/*

* Linked List Cycle

*/

public class Solution38 {

class ListNode {

int val;

ListNode next;

ListNode(int x) {

val = x;

next = null;

}

}

public boolean hasCycle(ListNode head) {

if (head != null && head.next != null) {

ListNode one = head.next;

ListNode two = head.next.next;

while (one != two) {

if (one == null || two == null || two.next == null)

return false;

one = one.next;

two = two.next.next;

}

return true;

}

return false;

}

}