华为面试题——约瑟夫问题的C++简单实现（循环链表）

/*

    author:jiangxin

    Blog:http://blog.csdn.net/jiangxinnju

    Function:method of Josephus question

*/

#include <iostream>

using namespace std;

struct node

{

    int seq;

    node *next;

};

typedef struct node NODE;

void test_Josephus()

{

    /*假设共有n人，从第s个人开始数数，每数到m该人出列，后面的人重新开始数，知道全部人出列*/

    int n,s,m;

    NODE *head,*last,*current,*prev;

    cout << "Input the n,s,m(separate with space):";

    cin >> n >> s >> m;

for(int i=1;i<=n;i++) //建立循环链表

    {

        current = new NODE;

        current->seq = i;

        current->next = head;

        if(i == 1)

        {

            head = current;

            last = current;

        }

        else

        {

            last->next = current;

            last = last->next;

        }

    }

    current = head; //遍历循环链表，输出序列

    do

    {

        cout << current->seq << " ";

        current = current->next;

    }while(current!=head);

current = head; //将current置于第s个位置

    for(int i=1;i<s;i++)

    {

        current = current->next;

    }

    cout << endl;

for(int i=1;i<=n;i++) //共循环n轮，得到一个整体的输出序列

    {

        for(int j=1;j<m;j++)

        {

            prev = current;

            current = current->next;

        }

        cout << current->seq << " ";

        prev->next = current->next;

        delete current;

        current = prev->next;

    }

}