/in/foo.c: In function 'main':
/in/foo.c:39:11: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
   scanf("%d",a1[i]);
           ^
/in/foo.c:41:11: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
   scanf("%d",a2[i]);
           ^
/in/foo.c:43:11: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
   scanf("%d",a3[i]);
           ^