Compilare: main.cpp: In function 'int main()': main.cpp:35:29: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 35 | if (v[i].size() > mx) { | ~~~~~~~~~~~~^~~~ In file included from /usr/include/c++/12.2.1/deque:64, from /usr/include/c++/12.2.1/stack:60, from main.cpp:6: In member function 'void std::deque<_Tp, _Alloc>::pop_back() [with _Tp = int; _Alloc = std::allocator<int>]', inlined from 'void std::stack<_Tp, _Sequence>::pop() [with _Tp = int; _Sequence = std::deque<int, std::allocator<int> >]' at /usr/include/c++/12.2.1/bits/stl_stack.h:296:12, inlined from 'int main()' at main.cpp:47:19: /usr/include/c++/12.2.1/bits/stl_deque.h:1603:13: warning: 'imx' may be used uninitialized [-Wmaybe-uninitialized] 1603 | --this->_M_impl._M_finish._M_cur; | ^~ main.cpp: In function 'int main()': main.cpp:32:17: note: 'imx' was declared here 32 | int mx = 0, imx; | ^~~