foo.cc: In function 'int main()':
foo.cc:61:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Info>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |     for(int i=0;i<allRoad.size();i++) {
      |                 ~^~~~~~~~~~~~~~~

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