Compilare: main.cpp: In function 'll check(ll)': main.cpp:24:11: warning: unused variable 'first' [-Wunused-variable] 24 | #define x first | ^~~~~ main.cpp:31:14: note: in expansion of macro 'x' 31 | ll i, j, x; | ^ In file included from /usr/include/c++/12.2.1/istream:39, from /usr/include/c++/12.2.1/fstream:38, from main.cpp:1: In member function 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char; _Traits = std::char_traits<char>]', inlined from 'void solve()' at main.cpp:80:13: /usr/include/c++/12.2.1/ostream:202:25: warning: 'last' may be used uninitialized [-Wmaybe-uninitialized] 202 | { return _M_insert(__n); } | ~~~~~~~~~^~~~~ main.cpp: In function 'void solve()': main.cpp:63:24: note: 'last' was declared here 63 | ll i, st, dr, med, last; | ^~~~