foo.cc: In function 'void dfs(int)':
foo.cc:91:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |     for(int i=0;i<a1[x].size();i++)
      |                 ~^~~~~~~~~~~~~
foo.cc:93:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |     for(int i=0;i<b1[x].size();i++)
      |                 ~^~~~~~~~~~~~~
foo.cc:95:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |     for(int i=0;i<a2[x].size();i++)
      |                 ~^~~~~~~~~~~~~
foo.cc:97:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   97 |     for(int i=0;i<b2[x].size();i++)
      |                 ~^~~~~~~~~~~~~

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