Compilare: user.cpp: In function ‘void poloneza(std::string&)’: user.cpp:28:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<x.size(); i++) ^ user.cpp:22:9: warning: unused variable ‘o’ [-Wunused-variable] int o=0; ^ user.cpp:23:10: warning: unused variable ‘paranteza’ [-Wunused-variable] bool paranteza=false; ^ user.cpp:24:10: warning: unused variable ‘negativ’ [-Wunused-variable] bool negativ=false; ^ user.cpp:25:10: warning: unused variable ‘nu’ [-Wunused-variable] bool nu=false; ^ user.cpp:26:10: warning: unused variable ‘nup’ [-Wunused-variable] bool nup=false; ^