Compilare: main.cpp: In function 'int main()': main.cpp:18:24: warning: unused variable 'a' [-Wunused-variable] 18 | unsigned long long a, left, right, mid, ans; | ^ In file included from /usr/include/c++/12.2.1/istream:39, 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 member function 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long unsigned int) [with _CharT = char; _Traits = std::char_traits<char>]', inlined from 'int main()' at main.cpp:31:11: /usr/include/c++/12.2.1/ostream:206:25: warning: 'ans' may be used uninitialized [-Wmaybe-uninitialized] 206 | { return _M_insert(__n); } | ~~~~~~~~~^~~~~ main.cpp: In function 'int main()': main.cpp:18:45: note: 'ans' was declared here 18 | unsigned long long a, left, right, mid, ans; | ^~~