Compilare: user.cpp: In function ‘void bf()’: user.cpp:52:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:78:24: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(ef[i]==1||ef[i]==0&&d[i]==inf) ^