foo.cc: In member function 'bool MinimumCost_MaximumFlow::BellmanFord(int, int, int&, long long int&)':
foo.cc:65:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 | for(int i=0; i<G[Now].size(); i++) {
      |              ~^~~~~~~~~~~~~~

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