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 ) 
{
    struct ListNode* fast=pListHead;
    struct ListNode* slow=pListHead;
    while(fast)
    {
        if(k>0)
        {
            fast=fast->next;
            k--;
        }
        else if(k==0)
        {
            fast=fast->next;
            slow=slow->next;
        }
    }
    if(k>0)
    {
        slow=NULL;
    }

    return slow;
}