Compilare: user.cpp: In function ‘int main()’: user.cpp:3:21: warning: integer overflow in expression [-Woverflow] #define INF (1<<31)-2 ^ user.cpp:14:16: note: in expansion of macro ‘INF’ viz[i]=INF; ^ user.cpp:31:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[k].size();i++) ^ user.cpp:3:21: warning: integer overflow in expression [-Woverflow] #define INF (1<<31)-2 ^ user.cpp:37:28: note: in expansion of macro ‘INF’ if(viz[d]==INF) ^