/in/foo.cc: In function 'int main()':
/in/foo.cc:54:3: error: 'memset' was not declared in this scope
   memset(visit, false, sizeof(visit));
   ^~~~~~
/in/foo.cc:54:3: note: suggested alternative: 'wmemset'
   memset(visit, false, sizeof(visit));
   ^~~~~~
   wmemset
/in/foo.cc: In function 'int BFS(int, int)':
/in/foo.cc:47:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^