UVA 10815 Andy's First Dictionary

在刷书上的题！这道题基本上和作者的答案差不多，不过就是在插入操作那里我有点问题！百思不得其解！看答案发现用了stringstream，然后才算把这道题解决！

#include <iostream>#include <set>#include <string>#include <cctype>#include <sstream>using namespace std;int main(){string tmp1,tmp2;set<string> s1;while(cin>>tmp1){int lenth=tmp1.size();for(int i=0;i<lenth;++i){if(isalpha(tmp1[i]))tmp1[i]=tolower(tmp1[i]);elsetmp1[i]=' ';}        stringstream str(tmp1);        while(str>>tmp2)  s1.insert(tmp2);}for(set<string>::iterator it=s1.begin();it!=s1.end();++it)cout<<*it<<endl;return 0;}