/in/foo.cc: In function 'int main()':
/in/foo.cc:59:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |         for (i = 0; i < ans.size() - 1;i++) cout << ans[i] << ' ';
      |                     ~~^~~~~~~~~~~~~~~~