foo.cc: In function 'void Tarjan(int, int)':
foo.cc:32:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for(int i=0; i<a[u].size(); i++)
      |                  ~^~~~~~~~~~~~
foo.cc:41:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Node>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |     for(int i=0; i<b[u].size(); i++)
      |                  ~^~~~~~~~~~~~

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Found 6 testcases.
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