/in/foo.cc: In function 'int main()':
/in/foo.cc:32:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(q.size()<k){
      ~~~~~~~~^~
/in/foo.cc:41:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(q.size()<k)printf("%.5lf\n",c);
      ~~~~~~~~^~