/in/foo.cc: In function 'int main()':
/in/foo.cc:36:18: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
     scanf("%d",&n);
                ~~^
/in/foo.cc:37:44: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
     for (int i=1;i<=n;i++) scanf("%d",&a[i]);
                                       ~~~~~^