约瑟夫环问题__2019.03.31

#include <iostream>
#include <vector>

#define person_num 41
using namespace std;

typedef struct person
{
	int old_num;//学生原来的编号
	int num;//学生的报数
}person;

void fun()
{
	vector<person> temp;
	for (int i = 1;i <= person_num;++i)//对人进行编号
	{
		person tep;
		tep.old_num = i;
		tep.num = 0;
		temp.push_back(tep);
	}

	bool flag = false;//队尾人是否出列

	int fina_num = 0;//保留队尾人的报数

	while (temp.size() != 2)
	{
		vector<person>::iterator it = temp.begin();
		vector<person>::iterator it_end = temp.end();
		--it_end;
		int num = it_end->num;
		if (flag == false)
		{
			num = it_end->num;
		}
		if (flag == true)
		{
			num = fina_num;
		}
		for (unsigned int i = 0;i < temp.size();++i)//1-3进行报数
		{
			if (num == 3)
			{
				num = 1;
				it->num = num;
				++it;
			}
			else
			{
				num = num + 1;
				if (num == 4)
				{
					num = 1;
				}
				it->num = num;
				++it;
			}
		}
		for (it = temp.begin();it != temp.end();)//报到偶数的出列
		{
			if (it->num  == 3)
			{
				vector<person>::iterator it_end = temp.end();
				--it_end;
				if (it == it_end)//如果要出列的是队尾的人，应将队尾人的报数记录下来
				{
					flag = true;
					fina_num = it->num;
				}
				else
				{
					flag = false;
				}
				it = temp.erase(it);//迭代器失效问题
			}
			else
			{
				++it;
			}
		}
	}
	vector<person>::iterator it = temp.begin();
	cout << it->old_num << endl;
	++it;
	cout << it->old_num << endl;
}

int main()
{
	fun();
	return 0;
}

#include <iostream>
#include <vector>

#define person_num 10
using namespace std;

typedef struct person
{
	int old_num;//学生原来的编号
	int num;//学生的报数
}person;

void fun()
{
	vector<person> temp;
	for (int i = 1;i <= person_num;++i)//对人进行编号
	{
		person tep;
		tep.old_num = i;
		tep.num = 0;
		temp.push_back(tep);
	}

	bool flag = false;//队尾人是否出列

	int fina_num = 0;//保留队尾人的报数

	while (temp.size() != 1)
	{
		vector<person>::iterator it = temp.begin();
		vector<person>::iterator it_end = temp.end();
		--it_end;
		int num = it_end->num;
		if (flag == false)
		{
			num = it_end->num;
		}
		if (flag == true)
		{
			num = fina_num;
		}
		for (unsigned int i = 0;i < temp.size();++i)//1-10进行报数
		{
			if (num == person_num)
			{
				num = 1;
				it->num = num;
				++it;
			}
			else
			{
				num += 1;
				it->num = num;
				++it;
			}
		}
		for (it = temp.begin();it!=temp.end() ;)//报到偶数的出列
		{
			if (it->num % 2 == 0)
			{
				vector<person>::iterator it_end = temp.end();
				--it_end;
				if (it == it_end)//如果要出列的是队尾的人，应将队尾人的报数记录下来
				{
					flag = true;
					fina_num = it->num;
				}
				else
				{
					flag = false;
				}
				it=temp.erase(it);//迭代器失效问题
			}
			else
			{
				++it;
			}
		}
	}
	vector<person>::iterator it = temp.begin();
	cout << temp.size() << endl;
	cout << it->old_num << endl;
}

int main()
{
	fun();
	return 0;
}