foo.cc: In function 'int main(int, char**)':
foo.cc:55:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         for (int i = 0; i < vt_nPrime.size(); i++)
      |                         ~~^~~~~~~~~~~~~~~~~~

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