foo.cc: In function 'int dfs1(int)':
foo.cc:10:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int i=0; i<f[x].size(); i++)
      |                  ~^~~~~~~~~~~~
foo.cc:17:1: warning: no return statement in function returning non-void [-Wreturn-type]
   17 | }
      | ^
foo.cc: In function 'int dfs2(int)':
foo.cc:23:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for(int i=0; i<f[x].size(); i++)
      |                  ~^~~~~~~~~~~~
foo.cc:31:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |     for(int i=0; i<f[x].size(); i++)
      |                  ~^~~~~~~~~~~~
foo.cc:34:1: warning: no return statement in function returning non-void [-Wreturn-type]
   34 | }
      | ^

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Found 5 testcases.
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