HDU 2072 单词统计

#include<set>
#include<cstdio>
#include<string>
#include<iostream>
using namespace std;
int main()
{
set<string> st;
string s="";
char c;
while((c=getchar())!='#')
{
s+=c;
while(c!='\n')
{
while((c=getchar())!=' '&& c!='\n')
s+=c;
if(s.length())
st.insert(s);
s="";
}
cout<<st.size()<<endl;
st.clear();
}
return 0;
}