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 ) {
    // write code here
    if(pListHead==NULL)return NULL;
    struct ListNode* slow=pListHead;
    struct ListNode* fast=pListHead;
    if(k<=0)return NULL;
    while(k>1)
    {
        k--;
        if(fast)
        fast=fast->next;
        else
        fast=NULL;
    }
    if(!fast)return NULL;
    while(fast->next)
    {
        slow=slow->next;
        fast=fast->next;
    }
    return slow;


}