Compilare: main.cpp: In function 'void adauga(std::__cxx11::string)': main.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<cuv.size();i++) ~^~~~~~~~~~~ main.cpp: In function 'void sterge(std::__cxx11::string, nod, int)': main.cpp:41:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz==cuv.size()) ~~~^~~~~~~~~~~~ main.cpp: In function 'int aparitii(std::__cxx11::string)': main.cpp:67:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<cuv.size();i++) ~^~~~~~~~~~~ main.cpp: In function 'int prefix(std::__cxx11::string)': main.cpp:85:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<cuv.size();i++) ~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:105:13: warning: unused variable 'nr' [-Wunused-variable] int nr; ^~