foo.cc: In function 'void dfs1(int)':
foo.cc:21:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |         for(int i=0;i<G1[x].size();i++){
      |                     ~^~~~~~~~~~~~~
foo.cc: In function 'void dfs2(int)':
foo.cc:30:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |         for(int i=0;i<G2[x].size();i++){
      |                     ~^~~~~~~~~~~~~
foo.cc: In function 'int dfs3(int)':
foo.cc:39:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |         for(int i=0;i<G3[x].size();i++){
      |                     ~^~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:80:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |                         for(int k=0;k<G1[j].size();k++){
      |                                     ~^~~~~~~~~~~~~

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