cf 44 A

   

链接：http://codeforces.com/problemset/problem/44/A

直接判重

#include <bits/stdc++.h>using namespace std;string s1,s2;map<pair<string,string>,int> m;int main(){    int n;    scanf("%d",&n);    while(n--)    {        cin>>s1>>s2;        m[make_pair(s1,s2)]++;    }    printf("%d",m.size());    return 0;}