题解 | #链表中倒数最后k个结点#

/**
 * struct ListNode {
 *	int val;
 *	struct ListNode *next;
 * };
 */
/**
 * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
 *
 * 
 * @param pHead ListNode类 
 * @param k int整型 
 * @return ListNode类
 */
 struct ListNode* FindKthToTail(struct ListNode* pHead, int k)
{
    if(pHead==NULL)
        return NULL;
	int num = 0;
	struct ListNode* cur = pHead;
	while (cur)
	{
		num++;

		cur = cur->next;
	}
	if(k>num)
		return NULL;
	cur = pHead;
	while (num - k)
	{
		if(cur)
		    cur = cur->next;
		k++;
	}
	return cur;
}