foo.cc: In function 'int get(int, int)':
foo.cc:38:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |     for (int i = 0; i < graph_r[node].size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc: In function 'int work()':
foo.cc:85:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |         for (int i = 0; i < graph[elem].size(); i++) {
      |                         ~~^~~~~~~~~~~~~~~~~~~~

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