/in/foo.cc: In function 'int main()':
/in/foo.cc:12:15: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'll* {aka long long int*}' [-Wformat=]
  scanf("%d",&n);
             ~~^
/in/foo.cc:17:18: warning: format '%d' expects argument of type 'int', but argument 2 has type 'll {aka long long int}' [-Wformat=]
  printf("%d",f[n]);
              ~~~~^