Compilare: user.cpp: In member function ‘bool Line::operator=(Line)’: user.cpp:19:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void swap_Line(Line, Line)’: user.cpp:94:10: warning: variable ‘C’ set but not used [-Wunused-but-set-variable] Line C = A; ^ user.cpp: In function ‘int main()’: user.cpp:132:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < Points_of_Line[i].size(); j++ ){ ^ user.cpp:153:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < G[Node].size(); i++ ){ ^