sListNode* JosephCycle(sListNode* pHead, DataType x) 
{ 
 if(pHead == NULL) 
 return NULL; 
 sListNode* cur = pHead; 
 while(1) 
 { 
 DataType m = x; 
 if(cur->next == cur) 
 { 
 return cur; 
 } 
 while(--m) 
 { 
 cur = cur->next; 
 } 
 //delete替换法 
 cur->data = cur->next->data; 
 sListNode* del = cur->next; 
 cur->next = cur->next->next; 
 free(del); 
 del=NULL; 
 } 

void TestJosephCycle() 
{ 
 sListNode* list = NULL; 
 Push_Back(list, 1); 
 Push_Back(list, 2); 
 Push_Back(list, 3); 
 Push_Back(list, 4); 
 Push_Back(list, 5); 
 Push_Back(list, 6); 
 Push_Back(list, 7); 
 Push_Back(list, 8); 
 Push_Back(list, 9); 
 PrintList(list); 
 //建环 
 sListNode* cur = list; 
 while(cur->next != NULL) 
 { 
 cur = cur->next; 
 } 
 cur->next = list; 
 sListNode* ret = JosephCycle(list, 3); 
 cout<<"Joseph:"<<ret->data<<endl; 
 //解环 
 free(ret); //明确知道只有一个节点，直接释放 
 ret = NULL; 
}