Compilare: main.cpp: In function 'int main()': main.cpp:26:16: warning: ignoring return value of 'bool std::queue<_Tp, _Sequence>::empty() const [with _Tp = int; _Sequence = std::deque<int, std::allocator<int> >]', declared with attribute 'nodiscard' [-Wunused-result] 26 | s.empty(); | ~~~~~~~^~ In file included from /usr/include/c++/12.2.1/queue:64, from main.cpp:9: /usr/include/c++/12.2.1/bits/stl_queue.h:218:7: note: declared here 218 | empty() const | ^~~~~