foo.cc: In function 'int main()':
foo.cc:51:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 | for(int j=0; j<map[i].size(); j++){
      |              ~^~~~~~~~~~~~~~

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