Compilare: user.cpp: In function ‘int main()’: user.cpp:25:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (sol.size() < n) { ^ user.cpp:44:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<sol.size();i++) ^ user.cpp:48:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<sol.size();i++) ^