题目地址:http://acm.hdu.edu.cn/showproblem.php?pid=1016

递归法:(简单但会超时。。。)

HDU1016 Prime Ring Problem#include <iostream>
HDU1016 Prime Ring Problem#include 
<vector>
HDU1016 Prime Ring Problem#include 
<cmath>
HDU1016 Prime Ring Problem
using namespace std;
HDU1016 Prime Ring Problem
HDU1016 Prime Ring Problem
void swap(int& a,int& b)


回溯法:

HDU1016 Prime Ring Problem#include<iostream>
HDU1016 Prime Ring Problem#include
<cmath>
HDU1016 Prime Ring Problem
using namespace std;
HDU1016 Prime Ring Problem
HDU1016 Prime Ring Problem
int a[20],curCase=0,n;
HDU1016 Prime Ring Problem
HDU1016 Prime Ring Problem
bool isNotIn(int num,int end)

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