双指针
链表中倒数最后k个结点
http://www.nowcoder.com/practice/886370fe658f41b498d40fb34ae76ff9
ListNode first = head;
ListNode last = head;
for(int i = 0;i < k;i++){
if(first == null){
return first;
}
first = first.next;
}
while(first != null){
first = first.next;
last = last.next;
}
return last;
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