单链表中查找倒数第K个节点-创新互联

// 查找链表的倒数第K个结点

示意图：

PSListNode FindLastKNode(PSListNode pHead, int K )

{

                PSListNode pFast = pHead ;

                PSListNode pSlow = pHead ;

                if (pHead == NULL || K <= 0)

               {

                                return NULL ;

               }

                while (--K )

               {

                                if (pFast == NULL )

                               {

                                                return NULL ;

                               }

                               pFast = pFast->pNext;

               }

                while (pFast->pNext)

               {

                               pSlow = pSlow->pNext;

                               pFast = pFast->pNext;

               }

                return pSlow;

}

建议：如果理解不清楚，一定要画个图，看着图写代码会容易很多，思路也会清晰

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