/in/foo.cc: In function 'int main()':
/in/foo.cc:28:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 | for(int j=0;j<=flag[i].size()-1;j++)
      |             ~^~~~~~~~~~~~~~~~~~
/in/foo.cc:38:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 | for(int j=0;j<=flag[i].size()-1;j++)
      |             ~^~~~~~~~~~~~~~~~~~