/in/foo.cc: In function 'int use(int, std::vector<int>)':
/in/foo.cc:20:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < medi.size(); i++) {
                  ~~^~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:55:9: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
      if (temp != state)
         ^
/in/foo.cc:35:6: warning: unused variable 'drug' [-Wunused-variable]
  int drug=0,tmp;
      ^~~~
/in/foo.cc:35:13: warning: unused variable 'tmp' [-Wunused-variable]
  int drug=0,tmp;
             ^~~