Compilare: user.cpp: In function ‘void bf(int)’: user.cpp:11:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[k].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:44:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ^ user.cpp:53:9: warning: unused variable ‘minn’ [-Wunused-variable] int minn=2000000000, s=0; ^