/in/foo.cc: In function 'int search(std::vector<std::vector<int> >&)':
/in/foo.cc:10:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<r.size();i++)
              ~^~~~~~~~~
/in/foo.cc:12:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=i+1;j<r.size();j++)
                 ~^~~~~~~~~
/in/foo.cc:9:6: warning: unused variable 'count' [-Wunused-variable]
  int count=0;
      ^~~~~