Compilare: In file included 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/sstream:38, from /usr/include/c++/12.2.1/complex:45, from /usr/include/c++/12.2.1/ccomplex:39, from /usr/include/c++/12.2.1/x86_64-pc-linux-gnu/bits/stdc++.h:54, from main.cpp:1: In static member function 'static constexpr void std::char_traits<char>::assign(char_type&, const char_type&)', inlined from 'constexpr void std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::push_back(_CharT) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]' at /usr/include/c++/12.2.1/bits/basic_string.h:1529:21, inlined from 'constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator+=(_CharT) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]' at /usr/include/c++/12.2.1/bits/basic_string.h:1351:17, inlined from 'std::string solve()' at main.cpp:92:16: /usr/include/c++/12.2.1/bits/char_traits.h:354:14: warning: 'what' may be used uninitialized [-Wmaybe-uninitialized] 354 | __c1 = __c2; | ~~~~~^~~~~~ main.cpp: In function 'std::string solve()': main.cpp:64:10: note: 'what' was declared here 64 | char what; | ^~~~