/in/foo.c: In function 'dfsFill':
/in/foo.c:91:3: warning: 'return' with no value, in function returning non-void
   return;
   ^~~~~~
/in/foo.c:86:5: note: declared here
 int dfsFill(int x){
     ^~~~~~~
/in/foo.c: In function 'dfsHash':
/in/foo.c:34:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.c: In function 'initArr':
/in/foo.c:55:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^