Compilare: main.cpp: In function 'void adauga(std::__cxx11::string)': main.cpp:20:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<s.size();j++) ~^~~~~~~~~ main.cpp: In function 'void sterge(std::__cxx11::string)': main.cpp:35:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<s.size();j++) ~^~~~~~~~~ main.cpp: In function 'int nrcuv(std::__cxx11::string)': main.cpp:45:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<s.size();j++) ~^~~~~~~~~ main.cpp: In function 'int celmailungprefix(std::__cxx11::string)': main.cpp:58:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<s.size();j++) ~^~~~~~~~~