摘要： 素数环，回溯法，DFS基础题。对于DFS偶还没接触过，看到一篇好的文章，分享下：http://yangjunke111.blog.163.com/blog/static/135279606201041312753102/ 额，直接看代码吧#include <iostream>using namespace std;int n,cas=1,visit[20],result[20]={0,1},p[]={0,0,1,1,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,1,0};void DFS( 阅读全文