foo.cc: In function 'void dijkstra(int, int, std::vector<std::pair<int, long long int> >*, long long int*)':
foo.cc:14:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for(int i=0;i<e[now].size();i++){
      |                 ~^~~~~~~~~~~~~~

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