Compilare: user.cpp: In function ‘void bf(int)’: user.cpp:23:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[actual].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:68:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[valoare].size();i++) ^