题解 | #链表中倒数第k个结点#

/**
 * struct ListNode {
 *	int val;
 *	struct ListNode *next;
 * };
 */

/**
 * 
 * @param pListHead ListNode类 
 * @param k int整型 
 * @return ListNode类
 */
struct ListNode* FindKthToTail(struct ListNode* pListHead, int k ) 
{
    if(pListHead == NULL)
    {
        return NULL;
    }
    struct ListNode* fast = pListHead;
    struct ListNode* slow = pListHead;
    while(k)
    {
        fast = fast->next;
        k--;
        if(fast == NULL && k != 0)
        {
            return NULL;
        }
    }
    while(fast)
    {
        fast = fast->next;
        slow = slow->next;
    }
    return slow;
}