/in/foo.c: In function 'main':
/in/foo.c:37:2: warning: 'memset' used with constant zero length parameter; this could be due to transposed parameters [-Wmemset-transposed-args]
  memset(c,sizeof(c),0);
  ^~~~~~
/in/foo.c:71:3: warning: 'memset' used with constant zero length parameter; this could be due to transposed parameters [-Wmemset-transposed-args]
   memset(f,sizeof(f),0);
   ^~~~~~
/in/foo.c: In function 'dijkstra':
/in/foo.c:33:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^