Compilare: In file included from /usr/include/c++/12.2.1/functional:54, from /usr/include/c++/12.2.1/x86_64-pc-linux-gnu/bits/stdc++.h:71, from main.cpp:1: In constructor 'constexpr std::_Head_base<_Idx, _Head, false>::_Head_base(_UHead&&) [with _UHead = int&; long unsigned int _Idx = 0; _Head = int]', inlined from 'constexpr std::_Tuple_impl<_Idx, _Head, _Tail ...>::_Tuple_impl(_UHead&&, _UTail&& ...) [with _UHead = int&; _UTail = {int&, int&}; <template-parameter-2-3> = void; long unsigned int _Idx = 0; _Head = int; _Tail = {int, int}]' at /usr/include/c++/12.2.1/tuple:292:38, inlined from 'constexpr std::tuple< <template-parameter-1-1> >::tuple(_UElements&& ...) [with _UElements = {int&, int&, int&}; bool _Valid = true; typename std::enable_if<_TCC<_Valid>::__is_implicitly_constructible<_UElements ...>(), bool>::type <anonymous> = true; _Elements = {int, int, int}]' at /usr/include/c++/12.2.1/tuple:744:54, inlined from 'constexpr std::tuple<typename std::__strip_reference_wrapper<typename std::decay<_Elements>::type>::__type ...> std::make_tuple(_Elements&& ...) [with _Elements = {int&, int&, int&}]' at /usr/include/c++/12.2.1/tuple:1581:62, inlined from 'int main()' at main.cpp:62:23: /usr/include/c++/12.2.1/tuple:200:11: warning: 'drj' may be used uninitialized [-Wmaybe-uninitialized] 200 | : _M_head_impl(std::forward<_UHead>(__h)) { } | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:13:20: note: 'drj' was declared here 13 | int n, m, dri, drj; | ^~~ In constructor 'constexpr std::_Head_base<_Idx, _Head, false>::_Head_base(_UHead&&) [with _UHead = int&; long unsigned int _Idx = 0; _Head = int]', inlined from 'constexpr std::_Tuple_impl<_Idx, _Head, _Tail ...>::_Tuple_impl(_UHead&&, _UTail&& ...) [with _UHead = int&; _UTail = {int&, int&}; <template-parameter-2-3> = void; long unsigned int _Idx = 0; _Head = int; _Tail = {int, int}]' at /usr/include/c++/12.2.1/tuple:292:38, inlined from 'constexpr std::tuple< <template-parameter-1-1> >::tuple(_UElements&& ...) [with _UElements = {int&, int&, int&}; bool _Valid = true; typename std::enable_if<_TCC<_Valid>::__is_implicitly_constructible<_UElements ...>(), bool>::type <anonymous> = true; _Elements = {int, int, int}]' at /usr/include/c++/12.2.1/tuple:744:54, inlined from 'constexpr std::tuple<typename std::__strip_reference_wrapper<typename std::decay<_Elements>::type>::__type ...> std::make_tuple(_Elements&& ...) [with _Elements = {int&, int&, int&}]' at /usr/include/c++/12.2.1/tuple:1581:62, inlined from 'int main()' at main.cpp:62:23: /usr/include/c++/12.2.1/tuple:200:11: warning: 'dri' may be used uninitialized [-Wmaybe-uninitialized] 200 | : _M_head_impl(std::forward<_UHead>(__h)) { } | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:13:15: note: 'dri' was declared here 13 | int n, m, dri, drj; | ^~~