foo.cc: In function 'int main()':
foo.cc:50:34: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
printf("%d\n",ans);
^
foo.cc:32:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
~~~~~^~~~~~~~~
foo.cc:36:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&a[i]);
~~~~~^~~~~~~~~~~~
