Eroare de compilare: user.cpp: In function ‘std::pair<double, double> Intersect(double, double, double, std::pair<double, double>, std::pair<double, double>)’: user.cpp:41:18: error: ‘A1’ was not declared in this scope double det = A1 * B2 - A2 * B1; ^ user.cpp:41:33: error: ‘B1’ was not declared in this scope double det = A1 * B2 - A2 * B1; ^ user.cpp:42:32: error: ‘C1’ was not declared in this scope double X = (B1 * C2 - B2 * C1) / det; ^ user.cpp: In function ‘void Solve()’: user.cpp:58:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k+1<Sol.size();k++) ^ user.cpp:84:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i+1<Sol.size();i++) ^