Compilare: user.cpp: In function ‘int main()’: user.cpp:30:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<reteta.length();i++) ^ user.cpp:42:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<lista.size();j++) ^ user.cpp:65:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<lista.size();i++) ^