#include <iostream>
#include <string>
using namespace std;
int main ()
 {
string s[2002];
unsigned int n;
bool t=false;
bool t1=false;
bool t2=false;
bool t3=false;
cin>>n;
for( int i=1;i<=2*n;i++)
{
cin>>s[i];
if("Slytherin"==s[i])
t=true;
if("Hufflepuff"==s[i])
t2=true;
if("Gryffindor"==s[i])
t1=true;
if("Ravenclaw"==s[i])
t1=true;
}
if(t)
{
cout<<"Slytherin:"<<endl;
for(int i=1;i<=n;i++)
if("Slytherin"==s[2*i])
cout<<s[2*i-1]<<endl;
cout<<endl;
}
if(t2)
{
cout<<"Hufflepuff:"<<endl;
for(int i=1;i<=n;i++)
{
if("Hufflepuff"==s[2*i])
cout<<s[2*i-1]<<endl;
}
cout<<endl;
}
if(t1)
{
cout<<"Gryffindor:"<<endl;
for(int i=1;i<=n;i++)
if("Gryffindor"==s[2*i])
cout<<s[2*i-1]<<endl;
}
if(t)
{
cout<<"Ravenclaw:"<<endl;
for(int i=1;i<=n;i++)
if("Ravenclaw"==s[2*i])
cout<<s[2*i-1]<<endl;
}
 return 0;
}

Xatolaringiz juda ko'p, asosiy o'rindagi xato kiritish jarayonidagi xato! ya'ni "cin" operatori probel tashlanganda ham kiritish tugaganini bildiradi, ism esa 1 talik, 2-talik,3-talik... bo'lishi mumkin

cin.getline(s[i]) yana qanday xato

"cin" tashqari yana nima xato