题解 | #下厨房#
藏宝图
http://www.nowcoder.com/practice/74475ee28edb497c8aa4f8c370f08c30
双指针
#include<bits/stdc++.h>
using namespace std;
int main()
{
set<string> material_set;
string str;
int sum=0;
while( cin>>str )
{
if( material_set.find( str ) != material_set.end() ) continue;
material_set.insert(str);
sum++;
}
cout<<sum<<endl;
return 0;
} 
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