View Compilation Error

0_0_17772759_10440.cpp: In function 'int query(int, int, int, int, int, int, int)':
0_0_17772759_10440.cpp:167:16: error: 'cout' was not declared in this scope
     if (debug) cout << R[0][2] << endl;
                ^
0_0_17772759_10440.cpp:167:35: error: 'endl' was not declared in this scope
     if (debug) cout << R[0][2] << endl;
                                   ^