Compilare: user.cpp: In function ‘int main()’: user.cpp:16:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(sol.size()!=n) ^ user.cpp:24:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size()-1;i++) ^ user.cpp:27:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();i++) ^