[HAWKOR] 猎鹰天空

typedef struct Node
{
   int Data;
   Node *Next;
};

Node *ReverseList(Node *pHead)
{
   Node *pReverseHead = NULL;
   while (pHead != NULL)
   {
      Node *pTmp = pHead;
      pHead = pHead->Next;
      pTmp->Next = pReverseHead;
      pReverseHead = pTmp;
   }
   return pReverseHead;
}

bool hasCircle(Node *pHead)
{
   Node *pSlow = pHead;
   Node *pFast = pHead;
   while (pSlow && pFast && (pFast=pFast->Next) && pFast!=pSlow)
   {
      pSlow=pSlow->Next;
      pFast=pFast->Next;
   }
   return pFast != NULL;
}