/in/foo.cc: In function 'long long int spfa1(long long int)':
/in/foo.cc:22:29: warning: overflow in implicit constant conversion [-Woverflow]
  memset(dis, INF, sizeof dis);
                             ^
/in/foo.cc: In function 'void spfa2(long long int)':
/in/foo.cc:43:29: warning: overflow in implicit constant conversion [-Woverflow]
  memset(dis, INF, sizeof dis);
                             ^