hdu 1327 Definite Values--map

/*题意：a有确定的值 其他的是随机值通过运算，那些变量是确定的值map 的应用*///#pragma warning(disable: 4786)//加上这句可以屏蔽长标示符带来的警告#include<stdio.h>#include<iostream>#include<map>#include<string>using namespace std;map<string,bool>m;map<string,bool>::iterator it;void pro(string s,string ss){it=m.find(ss);if(it==m.end()){m[ss]=false;}m[s]=m[ss];}int main(){string s,ss;int i,n,j,ni=1;while(scanf("%d",&n),n){m.clear();m.insert(pair<string,bool>("a",true));printf("Program #%d\n",ni++);for(i=1;i<=n;i++){cin>>s>>ss>>ss;pro(s,ss);}it=m.begin();int flag=0;while(it!=m.end()){if(it->second==true){cout<<(it->first)<<" ";flag=1;}it++;}if(flag==0)cout<<"none";cout<<endl<<endl;}return 0;}