Compilare: user.cpp: In function ‘void scoate_fata()’: user.cpp:23:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s2.size () > aux) { ^ user.cpp: In function ‘void scoate_deque()’: user.cpp:50:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s3.size () > aux) { ^ user.cpp: In function ‘void afis_top()’: user.cpp:82:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s3.size () > aux) { ^ user.cpp: In function ‘int main()’: user.cpp:126:21: warning: unused variable ‘qw’ [-Wunused-variable] int qw = s1.size(); ^