leetcode--010 Linked List Cycle II
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public ListNode detectCycle(ListNode head) {
ListNode s=head;
ListNode 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;
s=head;
while(s!=f){
s=s.next;
f=f.next;
}
return s;
}
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