foo.cc: In function 'int main()':
foo.cc:15:11: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
   15 |  printf("%d\n",ans);
      |          ~^    ~~~
      |           |    |
      |           int  long long int
      |          %lld
foo.cc:8:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
foo.cc:10:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |   scanf("%lld",&a[i]);
      |   ~~~~~^~~~~~~~~~~~~~

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