5-15 QQ帐户的申请与登陆 (25分)

#include "string"
#include "iostream"
#include "map"
using namespace std;
map<string,string> Q;

int main( )
{
// freopen("1.txt","r",stdin);
int m;
cin>>m;
string a3,a2;
char a1;
while(m--)
{
cin>>a1>>a2>>a3;
if(a1=='N')
{
if(Q.find(a2)==Q.end())
{
Q[a2]=a3;
cout<<"New: OK"<<endl;
}
else
{
cout<<"ERROR: Exist"<<endl;
}
}
if(a1=='L')
{
if(Q.find(a2)==Q.end())
{
cout<<"ERROR: Not Exist"<<endl;
}
else
{
map<string,string>::iterator it;
it=Q.find(a2);
if(it->second==a3)
{
cout<<"Login: OK"<<endl;
}
else
{
cout<<"ERROR: Wrong PW"<<endl;
}
}

}
}

return 0;
}