foo.cc: In function 'int dijkstra(int)':
foo.cc:21:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int>, std::allocator<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |         for(int i=0;i<g[f.x].size();i++)
      |                     ~^~~~~~~~~~~~~~

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