/in/foo.cc: In member function 'dts::ll dts::network_flows::bfs(dts::ll, dts::ll, double&, double&)':
/in/foo.cc:99:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (ll i=0;i<cw[now].size();i++)
                 ~^~~~~~~~~~~~~~~
/in/foo.cc: In function 'void dts::main()':
/in/foo.cc:140:10: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
          for (int i=1;i<=n;i++)
          ^~~
/in/foo.cc:142:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
    net.set_size(n-m+4);
    ^~~