foo.cc: In function 'bool solve(ll)':
foo.cc:102:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  102 |         for(int j=0; j<arv[i].size(); j++) {
      |                      ~^~~~~~~~~~~~~~

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