Compilare: user.cpp: In constructor ‘Expression::Expression(std::__cxx11::string)’: user.cpp:22:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.length();i++) /// impart Expr in mai multe subexpresii ~^~~~~~~~~~~ user.cpp: In member function ‘bool Expression::solve()’: user.cpp:80:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1+first_not;i<E.size();i++) ///procesare... ~^~~~~~~~~ user.cpp:86:21: warning: this ‘else’ clause does not guard... [-Wmisleading-indentation] else ^~~~ user.cpp:88:25: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘else’ switch(crtsgn) ^~~~~~