View Compilation Error

0_0_34943326_7577.cpp: In function 'int solve()':
0_0_34943326_7577.cpp:82:9: error: 'cout' was not declared in this scope
         cout<<ok[j];
         ^
0_0_34943326_7577.cpp:82:9: note: suggested alternative:
In file included from 0_0_34943326_7577.cpp:4:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^