Compilare: main.cpp: In function 'int main()': main.cpp:17:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dr<q.size()) ~~^~~~~~~~~ main.cpp:22:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(q.size()>st&&q.front()<0) ~~~~~~~~^~~ main.cpp:27:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(q.size()>=st) ~~~~~~~~^~~~