View Compilation Error

0_0_35885085_19946.cpp: In function 'int main()':
0_0_35885085_19946.cpp:4:11: error: 'cin' was not declared in this scope
     while(cin>>t){
           ^
0_0_35885085_19946.cpp:8:25: error: 'cout' was not declared in this scope
             if(r>(e-c)) cout<<"do not advertise\n";
                         ^
0_0_35885085_19946.cpp:9:42: error: 'cout' was not declared in this scope
                         else if(r<(e-c)) cout<<"advertise\n";
                                          ^
0_0_35885085_19946.cpp:10:30: error: 'cout' was not declared in this scope
                         else cout<<"does not matter\n";
                              ^