总共有m个人在圆桌上，依次报名，数到第n个数的人退出圆桌，下一个由退出人下一个开始继续报名，循环直到最后一个停止将编号输出

#include

#include

typedef struct Head * PHead;

typedef struct Node * PNode;

struct Head{

PNode Next;

int length;

};

struct Node {

int data;

PNode Next;

//PNode Prev;

};

PHead creat_clist()

{

PHead TempList ;

TempList = (PHead)malloc(sizeof(struct Head));

if(TempList == NULL)

{

printf("\nInitial failed,can't malloc the head\n");

return TempList;

}

TempList -> length = 0;

TempList -> Next = NULL;

return TempList;

}

void Insert_List(PHead CList,int val,int pos)

{

PNode TempNode;

//printf("enter insert func \n");

TempNode = (PNode)malloc(sizeof(struct Node));

TempNode -> data = val;

//printf("debug..\n");

if(NULL == TempNode)

{

printf("initial Node failed\n");

return ;

}

if(CList -> Next == NULL)//当前链表为空

{

CList -> Next = TempNode;

TempNode -> Next = TempNode;//此时最后一个节点的指针指向自己本身

CList -> length ++;//长度自加一

//TempNode -> Prev = NULL;

}

else if (1 == pos)//插入到链表头部

{

PNode tmp_node = CList -> Next;//

TempNode -> Next = tmp_node;//

while (tmp_node -> Next != CList -> Next)

{

tmp_node = tmp_node->Next;

}

tmp_node -> Next = TempNode;

//printf("delete num is :%d\n",tmp_node -> Next);

CList -> Next = TempNode;

CList -> length++;

}

else

{

PNode tmp_Node = CList -> Next;

for(int circle = 1;circle < pos - 1;circle++)

{

tmp_Node = tmp_Node -> Next;

}

TempNode -> Next = tmp_Node -> Next;

tmp_Node -> Next = TempNode;

CList -> length ++ ;

}

return ;

}

PNode pop_List(PHead CList,int pos)

{

printf("CList length is %d,pop number is : %d\n",CList -> length,pos);

if(pos <= 0)

{

printf("pos select error!\n");

exit(1);

}

if(1 == pos)

{

PNode tmp_node = CList -> Next; // 用于作为最后一个的判断和返回的参数

printf("delete num is : %d\n",(CList -> Next) -> data);

PNode Temp_Node = (CList -> Next) -> Next;//

while(Temp_Node -> Next != tmp_node)

{

//printf("skip data is :%d\n",Temp_Node -> data);

Temp_Node = Temp_Node -> Next;

}

CList -> Next = tmp_node -> Next;

Temp_Node -> Next = CList -> Next;

CList -> length -- ;

return tmp_node;

}

else if(pos == CList->length)

{

printf("pos == length\n");

PNode Temp_Node = CList->Next;

for(int circle = 0;circle < pos - 1;circle++)

{

//printf("skip data is : %d\n",Temp_Node -> data);

Temp_Node = Temp_Node -> Next;

}

printf("delete num is : %d\n",(Temp_Node -> Next) -> data);

Temp_Node -> Next = CList -> Next;

CList -> length--;

}

else

{

//printf("normal\n");

PNode Temp_Node = CList -> Next;

for(int circle = 1;circle < pos - 1; circle++)

{

Temp_Node = Temp_Node -> Next;

}

PNode tmp_node = Temp_Node -> Next;

Temp_Node -> Next = tmp_node -> Next;

printf("delete num is : %d\n",tmp_node -> data);

CList -> length --;

printf("length is : %d\n",CList -> length);

return tmp_node;

}

}

void freeClist(PHead CList)

{

PNode Temp_Node = CList -> Next;

for(int circle = 0; circle < CList -> length; circle++)

{

PNode tmp_node = Temp_Node;

Temp_Node = Temp_Node -> Next;

free(tmp_node);

}

free(CList);

printf("release successfully!\n");

return ;

}

void show_CList(PHead CList)

{

PNode temp_node = CList -> Next;

//while(temp_node -> Next != CList -> Next)

for(int circle = 0;circle < CList -> length; circle++)

{

printf("%5d",temp_node -> data);

temp_node = temp_node -> Next;

}

printf("\n");

}

int main()

{

PHead CList = creat_clist();

int num ;

int length;

printf("请输入约瑟夫环长度: \n");

scanf("%d",&length);

printf("\n请输入筛选的序号:\n");

scanf("%d",&num);

for(int circle = 0;circle < length; circle ++)

{

Insert_List(CList,circle+1,circle+1);

}

printf( "Original: \n" );

show_CList(CList);

//show_CList( );

printf("length:%d \n",CList -> length);

PNode tmp_node = CList -> Next;

while(CList -> length != 1)

{

for (int circle = 1;circle < num - 1;circle++)

{

tmp_node = tmp_node ->Next;

}

if(tmp_node -> Next == CList -> Next)

{

printf("delete data is : %d\n",(CList -> Next) -> data);

//free(tmp_node -> Next);

tmp_node -> Next = (tmp_node -> Next) -> Next;

CList -> Next = tmp_node -> Next;

CList -> length --;

}

else

{

printf("delete data is : %d \n",(tmp_node -> Next) -> data);

//free(tmp_node -> Next);

tmp_node -> Next = (tmp_node -> Next) -> Next;

CList -> length --;

}

tmp_node = tmp_node -> Next;

}

printf("Last is:\n");

show_CList(CList);

freeClist(CList);

return 0;

}