Compilare: main.cpp: In function 'int main()': main.cpp:42:18: warning: 'a' may be used uninitialized [-Wmaybe-uninitialized] 42 | for(unsigned a, b, edge = 0; edge < edges; edge += 1) { | ^ In file included from /usr/include/c++/12.2.1/bits/char_traits.h:46, from /usr/include/c++/12.2.1/ios:40, from /usr/include/c++/12.2.1/istream:38, from /usr/include/c++/12.2.1/fstream:38, from main.cpp:4: In function 'constexpr decltype (::new(void*(0)) _Tp) std::construct_at(_Tp*, _Args&& ...) [with _Tp = edge_t; _Args = {edge_t}]', inlined from 'static constexpr void std::allocator_traits<std::allocator<_CharT> >::construct(allocator_type&, _Up*, _Args&& ...) [with _Up = edge_t; _Args = {edge_t}; _Tp = edge_t]' at /usr/include/c++/12.2.1/bits/alloc_traits.h:518:21, inlined from 'constexpr std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::emplace_back(_Args&& ...) [with _Args = {edge_t}; _Tp = edge_t; _Alloc = std::allocator<edge_t>]' at /usr/include/c++/12.2.1/bits/vector.tcc:117:30, inlined from 'constexpr void std::vector<_Tp, _Alloc>::push_back(value_type&&) [with _Tp = edge_t; _Alloc = std::allocator<edge_t>]' at /usr/include/c++/12.2.1/bits/stl_vector.h:1294:21, inlined from 'int main()' at main.cpp:43:39: /usr/include/c++/12.2.1/bits/stl_construct.h:97:73: warning: 'b' may be used uninitialized [-Wmaybe-uninitialized] 97 | { return ::new((void*)__location) _Tp(std::forward<_Args>(__args)...); } | ^ main.cpp: In function 'int main()': main.cpp:42:21: note: 'b' was declared here 42 | for(unsigned a, b, edge = 0; edge < edges; edge += 1) { | ^