链表中倒数第k个结点

题目描述

输入一个链表，输出该链表中倒数第k个结点。

/*
public class ListNode {
    int val;
    ListNode next = null;

    ListNode(int val) {
        this.val = val;
    }
}*/
public class Solution {
    public ListNode FindKthToTail(ListNode head,int k) {
		if(head==null) return null;
        if(k<=0) return null;
        ListNode faster = head;
        ListNode slower = head;
        for(int i=0; i<k-1; ++i){
            faster = faster.next;
            if(faster==null) return null;
        }
     	if(faster==null) return null;
        while(faster.next!=null){
            faster = faster.next;
            slower = slower.next;
        }
        return slower;
    }
}