Compilare: user.cpp: In function ‘int main()’: user.cpp:51:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Q.size() < n) ~~~~~~~~~^~~~ user.cpp: In function ‘int next(int)’: user.cpp:35:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:75:10: warning: ‘ind’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << ind; ^