Compilare: main.cpp: In function 'int main()': main.cpp:16:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dr<q.size()) ~~^~~~~~~~~ main.cpp:21:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(q.size()>st&&q.front()<0) ~~~~~~~~^~~ main.cpp:26:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(q.size()>=st) ~~~~~~~~^~~~