foo.cc: In function 'int main()':
foo.cc:51:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Node>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |                         for(int i = 0;i < Hash[p.x * p.y].size();i++)
      |                                       ~~^~~~~~~~~~~~~~~~~~~~~~~~

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