ZOJ 1109 Language of FatMouse

#include<iostream>
#include<map>
#include<vector>
#include<string>
#include<stdio.h>
using namespace std;

int main()
{
string s;
string s1,s2;
char c[100];
int npos;
map<string,string> fat;
map<string,string>::iterator iter;
while(gets(c)){
s.assign(c);
if(s.size()==0)
break;
npos=s.find(' ');
s1=s.substr(0,npos);
s2=s.substr(npos+1);
fat[s2]=s1;
}
while(gets(c)){
s.assign(c);
iter=fat.find(s);
if(iter!=fat.end())
cout<<fat[s]<<endl;
else
cout<<"eh"<<endl;
}

return 0;
}