面试题0202 返回链表倒数第k个节点

面试0202 返回链表倒数第k个节点

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
class Solution {
    public int kthToLast(ListNode head, int k) {
        ListNode p = head;
        for (int i = 1; i <= k; i++) 
            p = p.next;
        ListNode q = head;
        while (p != null) {
            p = p.next;
            q = q.next;
        }
        return q.val;
    }
}