/in/foo.cc: In function 'int main()':
/in/foo.cc:29:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (q.size()==ans){
             ~~~~~~~~^~~~~
/in/foo.cc:32:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(q.size()>ans){
                ~~~~~~~~^~~~