/in/foo.c: In function 'main':
/in/foo.c:11:17: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'int *' [-Wformat=]
         scanf("%s", a[b[j]]);
                 ^
/in/foo.c:14:18: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'int *' [-Wformat=]
         printf("%s\n", a[j]);
                  ^
/in/foo.c:5:19: warning: unused variable 'k' [-Wunused-variable]
     int i = 0, j, k;
                   ^