foo.cc: In function 'int main()':
foo.cc:73:23: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
     printf("%d\n",g[i]);
                   ~~~~^
foo.cc:31:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen("aaa.in","r",stdin);
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~