foo.cc: In function 'void Output(std::vector<int>&)':
foo.cc:7:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |  for(int i=0;i<v.size();i++)
      |              ~^~~~~~~~~
foo.cc: In function 'int Search(std::vector<int>&, int)':
foo.cc:13:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |  for(int i=0;i<v.size();i++)
      |              ~^~~~~~~~~
foo.cc: In function 'int Div(int, int)':
foo.cc:61:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |   for(int i=flag-1;i<q.size();i++)
      |                    ~^~~~~~~~~
foo.cc:32:14: warning: control reaches end of non-void function [-Wreturn-type]
   32 |  vector<int> r,q;
      |              ^

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