剑指 Offer 22. 链表中倒数第k个节点

剑指 Offer 22. 链表中倒数第k个节点

快慢指针

快指针先走k步，再两个一块走。

class Solution {
    public ListNode getKthFromEnd(ListNode head, int k) {
        ListNode slow = head, fast = head;
        for(int i = 0; i < k; i++) fast = fast.next;
        while(fast != null){
            slow = slow.next;
            fast = fast.next;
        }
        return slow;
    }
}