foo.cc:50:9: warning: floating constant exceeds range of 'double' [-Woverflow]
   50 |         ans = 1e1000;
      |         ^~~
foo.cc: In function 'int main()':
foo.cc:54:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |         for (int i = 0; i < res.size(); i ++ )
      |                         ~~^~~~~~~~~~~~
foo.cc:58:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |             if (i != res.size() - 1) cout << '*';
      |                 ~~^~~~~~~~~~~~~~~~~

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