foo.cc: In function 'int main()':
foo.cc:27:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long double>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for (int i=0; i<p.size(); i++) {
      |                   ~^~~~~~~~~
foo.cc:41:16: warning: format '%f' expects argument of type 'double', but argument 2 has type 'long double' [-Wformat=]
   41 |     printf("%.6f\n",sum);
      |             ~~~^    ~~~
      |                |    |
      |                |    long double
      |                double
      |             %.6Lf

[Hydro](https://hydro.ac)提供评测服务