View Compilation Error

0_0_25115225_14186.cpp: In function 'int main()':
0_0_25115225_14186.cpp:12:5: error: 'cin' was not declared in this scope
     cin >> c;
     ^
0_0_25115225_14186.cpp:35:9: error: 'cout' was not declared in this scope
         cout << "Case #" << (t + 1) << ": " << (total - remain) / 2 << endl;
         ^
0_0_25115225_14186.cpp:35:72: error: 'endl' was not declared in this scope
         cout << "Case #" << (t + 1) << ": " << (total - remain) / 2 << endl;
                                                                        ^