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#include  <iostream>
using namespace std;
 
int main()
{
   int Y,M,D;
   cin >>Y>>M>>D;
   s=(5*Y+M*M-D)%4;
   if(s==0)
  {cout<<Gryffindor<<endl;} 
   else if (s==1)
   {
    cout<<Slytherin<<endl;
   } 
   else if (s==2)
   {
   cout<<Ravenclaw<<endl;
   } 
   else (s==3)
   {
   cout<<Hufflepuff<<endl;
   } 
} 

prog.cpp: In function ‘int main()’:
prog.cpp:8:4: error: ‘s’ was not declared in this scope
    s=(5*Y+M*M-D)%4;
    ^
prog.cpp:10:10: error: ‘Gryffindor’ was not declared in this scope
   {cout<<Gryffindor<<endl;}
          ^~~~~~~~~~
prog.cpp:13:11: error: ‘Slytherin’ was not declared in this scope
     cout<<Slytherin<<endl;
           ^~~~~~~~~
prog.cpp:17:10: error: ‘Ravenclaw’ was not declared in this scope
    cout<<Ravenclaw<<endl;
          ^~~~~~~~~

Standard output is empty