HDU 2072 单词数 --- stringstream+STL

/* HDU 2072 单词数 --- stringstream+STL */
#include <cstdio>
#include <iostream>
#include <sstream>
#include <string>
#include <set>
using namespace std;

set<string> k;

int main()
{
    string s;
    while (getline(cin, s) && s != "#"){
        k.clear();
        stringstream str(s);
        string tmp;
        while (str >> tmp){
            k.insert(tmp);
        }
        cout << k.size() << endl;
    }//while(get)
}