/in/foo.cc:3:33: warning: overflow in implicit constant conversion [-Woverflow]
 const int INF=0x3f3f3f3f,ll_INF=0x3f3f3f3f3f3f;
                                 ^~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:60:25: warning: 'g' may be used uninitialized in this function [-Wmaybe-uninitialized]
     dist[g]=1;sum[g]=w[g];f[g][0]=0;
                      ~~~^