安迪的第一个字典（UVa10815)

　　题目具体描述见：https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=1756

C++11代码如下：

 #include<iostream>
 #include<set>
 #include<string>
 #include<sstream>
 using namespace std;
 set<string> dict;

 int main() {
     string s,buf;
     while (cin >> s) {
         for (int i = ; i < s.length();i++) {
             if (isalpha(s[i])) s[i]=tolower(s[i]);
             else s[i] = ' ';
         }
         stringstream ss(s);
         while(ss >> buf) dict.insert(buf);
     }
     for (set<string>::iterator it = dict.begin(); it != dict.end(); it++)
         cout << *it << endl;
     return ;
 }