View Compilation Error

0_0_13943233_3192.cpp: In function 'int main()':
0_0_13943233_3192.cpp:15:11: error: 'cin' was not declared in this scope
     while(cin>>x>>y)
           ^
0_0_13943233_3192.cpp:23:37: error: 'cout' was not declared in this scope
                      if(su(b)==0)  {cout<<"Sorry"<<endl; break;}
                                     ^
0_0_13943233_3192.cpp:23:52: error: 'endl' was not declared in this scope
                      if(su(b)==0)  {cout<<"Sorry"<<endl; break;}
                                                    ^
0_0_13943233_3192.cpp:25:30: error: 'cout' was not declared in this scope
               if(i==(y+1))   cout<<"OK"<<endl;  
                              ^
0_0_13943233_3192.cpp:25:42: error: 'endl' was not declared in this scope
               if(i==(y+1))   cout<<"OK"<<endl;  
                                          ^