/in/foo.cc: In function 'int main()':
/in/foo.cc:9:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |         for (int i = 2; i < ans.size(); i++)
      |                         ~~^~~~~~~~~~~~
/in/foo.cc:12:44: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |                         for (int j = i ; j < ans.size(); j += i)
      |                                          ~~^~~~~~~~~~~~
/in/foo.cc:15:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |         for (int i = 2; i < ans.size(); i++)
      |                         ~~^~~~~~~~~~~~