foo.cc: In function 'void dfs(int)':
foo.cc:63:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |     for(int i=0;i<a1[x].size();i++) c1[a1[x][i]]++;
      |                 ~^~~~~~~~~~~~~
foo.cc:64:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |     for(int i=0;i<b1[x].size();i++) c1[b1[x][i]]--;
      |                 ~^~~~~~~~~~~~~
foo.cc:65:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |     for(int i=0;i<a2[x].size();i++) c2[a2[x][i]+n]++;
      |                 ~^~~~~~~~~~~~~
foo.cc:66:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |     for(int i=0;i<b2[x].size();i++) c2[b2[x][i]+n]--;
      |                 ~^~~~~~~~~~~~~

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