foo.cc: In function 'int main()':
foo.cc:47:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |    for(int i=0;i<r.size()-1;i++)
      |                ~^~~~~~~~~~~
foo.cc:56:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |   for(int i=k+1;i<q.size();i++) cout<<q[i];
      |                 ~^~~~~~~~~

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