Compilare: main.cpp: In function 'int main()': main.cpp:46:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dq.size()>=L&&dq.size()<=U) ~~~~~~~~~^~~ main.cpp:46:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dq.size()>=L&&dq.size()<=U) ~~~~~~~~~^~~