foo.cc: In function 'void search(int)':
foo.cc:27:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |                 for (int j = 0; j < v[x].s.length(); ++j)
      |                                 ~~^~~~~~~~~~~~~~~~~

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