/in/foo.c: In function 'main':
/in/foo.c:13:17: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'int *' [-Wformat=]
         scanf("%s",a[b[j]]);
                 ^
/in/foo.c:16:18: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'int *' [-Wformat=]
         printf("%s\n",a[j]);
                  ^
/in/foo.c:7:15: warning: unused variable 'k' [-Wunused-variable]
     int i=0,j,k;
               ^