Eroare de compilare: user.cpp:3:2: invalid preprocessing directive #incldue user.cpp: In function `int egal(std::pair<double, double>, std::pair<double, double>)': user.cpp:31: error: `fabs' undeclared (first use this function) user.cpp:31: error: (Each undeclared identifier is reported only once for each function it appears in.) user.cpp: In function `void solve()': user.cpp:60: error: `M_PI' undeclared (first use this function) user.cpp:60: error: `cos' undeclared (first use this function) user.cpp:60: error: `sin' undeclared (first use this function)