foo.cc: In member function 'dts::ll dts::network_flows::bfs(dts::ll, dts::ll, double&, double&)':
foo.cc:99:30: warning: comparison of integer expressions of different signedness: 'dts::ll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   99 |                 for (ll i=0;i<cw[now].size();i++)
      |                             ~^~~~~~~~~~~~~~~

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